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1. U PARAMETERS FOR PRIMARY ELEMENT The number of U parameters required varies according to the primary element chosen P3 and the method of calculation P4 The OCM 3 prompts the user by displaying the next required parameter insuring the programming is complete The following is a list of the specific primary elements to which the OCM 3 can be applied Refer to the page covering your particular application the rest may be disregarded P3 primary element 10 11 12 13 14 15 16 7ML19985AB01 exponential device e g proportional V notch Parshall etc BS 3680 Rectangular Flume ISO 4359 BS 3680 Round Nose Horizontal Crest Weir ISO 4374 BS 3680 Trapezoidal Flume ISO 4359 BS 3680 U throated Flume ISO 4359 BS 3680 Finite Crest Weir ISO 3846 BS 3680 Thin Plate Rectangular Weir ISO 1438 1 BS 3680 Thin Plate V Notch Weir ISO 1438 1 Rectangular Weir contracted Round Pipe Palmer Bowlus Flume H Flume Universal Head vs Flow Rectangular Area x Velocity Trapezoidal Area x Velocity Modified Trapezoidal Area x Velocity U channel Area x Velocity OCM Ill 51 17 18 19 20 Circular Area x Velocity Gull Wing Area x Velocity Egg shaped Area x Velocity Universal Area x Velocity The primary element must be installed in accordance with the manufacturers recommendations and in accordance with all governing regulations 7ML19985AB01 OCM Ill 52 SIMPLE EXPONE
2. does not need to be satisfied in order to reset D3 D4 Flow data specific to a particular time and date can be viewed under the data log F14 see Logging Totalizing Totalizing of the calculated flow is ongoing It is normally viewed under the Flow and Total display F2 An auxiliary totalizer D2 is provided for operator usage and is intended for short term totalizing to a maximum count of 999999 It can be reset or preset independently of the F2 totalizer after satisfying the security parameter FO In order to adjust the rate of filling of the totalizer the totalizer multiplier P32 can be set to an appropriate value The totalizer can be reset via F11 Totalizing that is specific to the time and date can be viewed under the data log F14 The 3 can be programmed to operate a remote totalizer by assigning any of the relays P15 18 or 21 to act as totalizer contact Under this function the maximum rate of contact closure is 2 sec with a closure duration of 200 msec The totalizer count is set by the relay setpoint parameter P16 19 or 22 respectively Typically the totalizer should be set for 300 to 3000 counts per day at maximum flow 7ML19985AB01 Ill 31 Under low flow conditions a cut off head P45 can be entered to avoid totalizing flows occurring at or below the flow corresponding to the cut off head LOGGING The 3 provides an extensive logging feature which can be viewed on the
3. Acal b mhcai X forh gt d Az b md xd B h d b md x d d m B byd where q flow rate d depth of channel flow rate at hcai head B channel top width cm v flow velocity cm sec bz channel base width cm Refer to Operation Flow Calculation 7ML19985AB01 OCM Ill 86 MODIFIED TRAPEZOIDAL AREA X VELOCITY transducer The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM Ill 87 U CHANNEL AREA X VELOCITY P3 16 U parameters required U parameters calculated UO base diameter D U1 area h obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter 7ML19985AB01 OCM Ill 88 U CHANNEL AREA x VELOCITY transducer The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM Ill 89 CIRCULAR AREA X VELOCITY 17 U parameters listed U parameters calculated UO conduit diameter ID U1 area h obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter 7ML19985AB01 OCM Ill 90 CIRCULAR AREA X VELOCITY transducer This dimension should be at least 15 cm 6 shorter than the blanking value P47 The transducer must be above the maximum head by at least the blanking value P47 7M
4. the physical dimensions of the primary element and the constant relating to units of measure for both linear dimensions and flow rates e g the general formula for flow through a single exponent primary element is Q KH the specific formula for flow through a 45 V notch weir is cfs 1 03 25 thus Q flow in cubic feet per second K constant of 1 03 H head in feet The absolute method is not applicable to the following Palmer Bowlus flume H flume DISPLAY The normal display during operation is the Flow and Total Display F2 flow rate field relay no echo field FLOW 0 00 ls RELAY 123 TOTAL 00000000 x STATE 01x totalizer field status field 7ML19985AB01 OCM Ill 28 Flow Rate Field flow rate units P5 FLOW 0 00 Vs I Totalizer Field TOTAL 00000000 x1 P total multiplier P32 Relay No Echo Field relay identification under loss of echo condition NO RELAY 123 ECHO wil alternately flash Status Field relay status 0 relay de energized 1 relay energized z alarm state indicated when flashing The OCM 3 provides illumination for the LCD for easier viewing of the display Illumination can be set P14 to be normally on or off or automatic When automatic is selected the lighting will automatically go on when keypad activity is sensed and then extinguish after 15 seconds of inactivity DAMPING For battery operation set display lig
5. throat length L U8 A U4 slope m obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION For flows that can be calculated by the equation 2 3 x 405 x Cv x Cs x Cd x bx h where q flow rate Cv velocity coefficient g gravitational acceleration Cs shape coefficient b throat width Cd z discharge coefficient h head RATIOMETRIC CALCULATION 1 For flows that can be calculated by the equation X CS Cscai x Cv Cvca x 5 where flow rate shape coefficient for maximum head flow rate at maximum head Cv velocity coefficient h head velocity coefficient for maximum head Neal maximum head Cd discharge coefficient for head Cs shape coefficient for head discharge coefficient for maximum head Refer to Operation Y Flow Calculation 7ML19985AB01 OCM Ill 62 BS 3680 TRAPEZOIDAL FLUME end transducer 3 to 4 x hax LaL The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 Ill 63 BS 3680 U Flume 4 U parameters required U parameters calculated UO approach diameter Da U4 Cv U1 throat diameter D U5 Cd U2 hump height p U6 Cu U3 throat length L U7 A obtain from manufacturer s
6. Ill 110 Considerations set the cold start F12 default baud to 1200 by removing jumper J1 on board A set both modems and the OCM 3 baud rates to 1200 set the remote modem to operate in the answer back mode Refer to modem s user manual Communication select serial programming link with OCM 3 from the utilities menu See Milltronics Utilities Software Disk The computer screen will display the letters These would normally have gone to the OCM 3 to ask it to send its display but the modem will have returned it to the screen instead Establishing Communication type the following ATD and the telephone number of the remote modem then press ENTER The modem will dial the number you have entered When the local modem establishes contact with the remote modem the local modem sends a message to the screen typical CONNECT press the v and ENTER keys to turn on the OCM 3 s display to serial channel The 3 is now on line and communication can be carried out The user may escape to the main menu of the Utilities software and select another program if so desired To close the communication return to the Terminal Emulation program 7ML19985AB01 OCM Ill 111 Ending Communication type W to break OCM 3 communication with the modem The computer screen will display a flashing message OCM 3 muted type not displayed on the screen and then press ENTER This will
7. cause both modems to switch to the command mode The local modem sends a message to the screen typical OK type ATH and press the ENTER key Both modems will hang up The local modem sends a message to the screen typical OK If the W is not sent the OCM 3 and its modem will still be in communication This may result in the OCM 3 modem being unable to answer calls successfully depending on the type of modem OCM 3 software 3 26 or later averts this problem by automatically breaking communication between the OCM 3 and its modem after 15 minutes 7ML19985AB01 OCM Ill 112 WWW siemens com processautomation Siemens Milltronics Process Instruments Inc Siemens Milltronics Process Instruments Inc 2005 1954Technology Drive PO Box 4225 Subject to change without prior notice Peterborough ON Canada K9J 7B1 9 0 1 Tel 705 745 2431 Fax 705 741 0466 Email techpubs smpi siemens com 7 ML 19 8 5 A B Printed in Canada
8. energize on high D11 volts 22 energize on high D11 volts 23 de energize on low Aux volts OCM III 45 24 energize on low Aux volts 25 de energize on high Aux volts 26 energize on high Aux volts 27 de energize up control on head 28 energize up control on head 29 de energize down control on head 30 energize down control on head 31 de energize up control on analog 32 energize up control on analog 33 de energize down control on analog 34 energize down control on analog 35 pulse flow totalizer 36 pulse sampler by volume 37 pulse sampler by time 38 pulse by time of day P16 P19 P22 relay 1 2 3 high setpoint P17 P20 P23 relay 1 2 3 low setpoint P24 mA assignment 0 flow rate 1 head 2 velocity 3 temperature P25 If custom mA 20 mA 2 0 normal custom P26 mA span 0 4 20 mA 1 0 20 mA 7ML19985AB01 OCM Ill 46 P27 mA damping secs P28 mA options emulator tracking 0 don t track emulator 1 track emulator P29 fail safe time secs P30 fail safe analog mode 0 hold last value 1 assume value in P31 P31 fail safe analog mA default value P32 totalizer multiplier 0 1 1000 0 001 12 x1 100 0 01 2 2 x1 10 0 1 32 x1 4 x10 5 x100 6 x1000 flow rate display decimal point 0 no decimal places 121 222 323 424 7ML19985AB01 OCM Ill 47 P34 printer mode 0 never print 1 in
9. local display or retrieved via the serial communication link The logging rate P39 can be fixed or variable The latter being useful in conserving logging space The condition for variable logging is determined when selecting the logging rate Variable logging rate conditions are catagorized as rate of change of flow percent of maximum flow or percent of maximum head Logging occurs at the normal slower rate while the condition is less than the setpoint P40 If the condition exceeds the log rapid setpoint the rapid rate of logging takes effect until the condition falls below the log normal setpoint P41 The associated setpoint units are change of maximum flowrate per minute of maximum flowrate and of maximum head respectively The setpoints represent the absolute value of the rate of change that is for either increasing or decreasing flowrate The OCM 3 does not recognize negative entries into P 40 and P 41 Flow data is logged in 1 2 increments from 0 to 110 of maximum flow Flows above 110 are logged as 110 Truncation of flows to 110 does not apply to daily totalization Log Capacity vs Rates rate capaci 1 min 31 days 5 3 months 15 9 months 30 1 year 60 1 5 years 24 hr 2 years e g 15 5 9 months max 3 months min Once the log is filled the old data will be successively written over with the new data being logged The log can be examined via F14 Viewing of the log is done by task and by meth
10. point 2 A4 0 1 head point 3 5 0 06 area point 3 0 15 head point 4 A720 09 area point 4 8 0 25 head point 5 A9 0 18 area point 5 10 0 45 head point 6 11 0 35 area point 6 8 0 70 head point 7 A9 0 59 area point 7 8 1 00 head point 8 A9 0 89 area point 8 For best accuracy concentrate data points where changes in flow are the greatest 7ML19985AB01 OCM Ill 7ML19985AB01 OCM Ill 98 MAINTENANCE The OCM 3 requires very little maintenance due to its solid state circuitry However a program of periodic preventative maintenance should be initiated This should include regular inspection general cleaning overall system performance checks and standard good housekeeping practices A periodic inspection of the transducer is recommended at which time any build up of material on the face should be removed The enclosure should be cleaned using a vacuum cleaner and a clean dry brush For battery replacement refer to Installation Installing the Memory Back up Battery 7ML19985AB01 OCM Ill 99 ERROR CODES Error Code Listing 10 11 12 13 14 15 16 20 21 7ML19985AB01 number underflow number overflow divide error bad argument invalid parameter system is locked head exceeds BS 3680 spec must use ratiometric invalid angle size invalid selection value is view only characterizer in use feature not available need who
11. s s s s s s s s s s s s e 1 7 9 10 11 12 13 15 16 17 18 19 20 2122 23 24 25 26 27 28 29 30 31 32 33 35 36 58 a 9 z L L1 95 Elus 8 8 2 is 9 30 E TRANSDUCER CURRENT msese TEMP VEL AUX RLI R2 o BIPOLAR vo SENSOR INPUT oureur ineur n ixl 0 10vV MAXLOAD POWER SEENFIRUCTION POSITION SW1 Praveen sok onset S MILLTRONICS PULSE200mA OPERATION OCM C MADE IN CANADA All field wiring must have insulation suitable for at least 250 V 2 20 VA Hazardous voltage present on transducer terminals during operation dc terminals shall be supplied from SELV source in accordance with IEC 1010 1 Annex H Relay contact terminals are for use with equipment having no accessible live parts and wiring having insulation suitable for at least 250 V The maximum allowable working voltage between adjacent relay contacts shall be 250 V 14 OCM Ill 7ML1 9985AB01 SYSTEM DIAGRAM Milltronics transducer OCM 3 see Specifications 1 Milltronics TS 2 temperature sensor 1 IA op customer device relay output customer alarm 3 pump or control device 1 auxiliary input customer davica 1 velocity input customer device RS 232 1 customer device bi po
12. should conform to standard instrumentation practices Ground shield at OCM 3 only RELAYS RL1 RL2 RL3 H relays shown de energized state contacts rated at 5 A at 250 V 32 83 5 non inductive oeM 42425 26 27 28 29 30 31 T T T 1 1 1 1 1 1 1 1 1 1 1 com n o All relays are certified for use in equipment where the short circuit capacity the circuits in which they are connected is limited by fuses having ratings not exceeding the rating of the relays 17 OCM Ill 7ML19985AB01 SYNCHRONIZATION Where two to a maximum of twelve transducers will be sharing a common conduit the OCM 3s should be synchronized In order to synchronize OCM 3s remove jumper J1 on board A on all but one OCM 3 interconnect the SYNC terminal TB1 20 of all OCM 3s Insure that all OCM 3s share a common ground TB1 34 1st 4 20 18 Ill 7ML19985AB01 POWER CONNECTIONS The OCM 3 power supply accepts 100 115 200 or 230 V ac per switch SW1 board B selection and 9 to 30 V dc The 3 operates either under ac or dc power or both ac and dc live simultaneously If both ac and dc power are live the OCM 3 normally draws power from the ac supply In the event that the ac supply fails the OCM 3 then draws po
13. specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION For flows that can be calculated by the equation 2 3 x g x Cv x Cu x Cd x D x n where q flow rate Cv velocity coefficient g gravitational acceleration Cu shape coefficient b throat width Cd discharge coefficient h head RATIOMETRIC CALCULATION 1 For flows that can be calculated by the equation X Cv Cvcai where q flow rate flow rate at maximum head head maximum head shape coefficient for head shape coefficient for maximum head Cv velocity coefficient velocity coefficient for maximum head Cd discharge coefficient for head discharge coefficient for maximum head Refer to Operation Flow Calculation 7ML19985AB01 OCM Ill 64 BS 3680 U FLUME 3 to 4 x hax L transducer The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM Ill 65 BS 3680 FINITE CREST WEIR 5 U parameters required U parameters calculated UO crest width b U3 C U1 crest height p U4 02 crest length L obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATIO
14. standpipe V This dimension should be at least 15 cm 6 shorter than the blanking value P47 The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM Ill 95 UNIVERSAL AREA X VELOCITY P3 20 Arbitrary area is typically used when the primary element and or its flow do not fit any of the primary elements covered by P3 There is no user difference between absolute and ratiometric calculations P4 The flow curve is characterized by entering the head Aeven and area Aoda ordinates for the number of data points n 4 to 16 over the flow range The first point A0 A1 generally being at 0 head and the last point A2n 2 A2n 1 generally being at maximum head U parameters required U parameters calculated UO number of data points n 4 to 16 U1 area h Aeven head Aodd area obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter e g typical open channel transducer The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 Ill 96 UNIVERSAL AREA X VELOCITY 1 00 odd 0 9 0 8 0 7 0 6 Area 0 5 0 4 02 01 0 0 1 02 04 05 06 07 08 09 100 Head even U0 8 A0z0 head point 1 A1 0 0 1 2 0 05 head point 2 0 03 area
15. 1 OCM Ill 59 BS 3680 Round Nose Horizontal Crest Weir 2 U parameters required U parameters calculated UO crest width b U3 Cv U1 crest height p U4 Cd U2 crest length L U5 A obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION P4 0 For flows that can be calculated by the equation 2 3 x g x Cv x Cs x Cd xb xh where q flow rate velocity coefficient g gravitational acceleration Cs shape coefficient b throat width Cd discharge coefficient h head RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation 9 X h hcaj 7 where q flow cal flow rate at maximum head h head maximum head Cv velocity coefficient velocity coefficient for maximum head Cd discharge coefficient for head discharge coefficient for maximum head Refer to Operation Flow Calculation 7ML19985AB01 OCM Ill 60 BS 3680 ROUND NOSE HORIZONTAL CREST WEIR transducer The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM Ill 61 BS 3680 TRAPEZOIDAL FLUME U parameters required U parameters calculated UO approach width B U5 U1 throat width b U6 Cd U2 hump height p U7 Cs U3
16. 3 set to something other than zero normally 1 Example For relay 1 Relay totalizer factor totalizer factor P32 relay 1 setpoint P16 100 P32 5 2 P16 50 units pulse The status of each relay is shown in the display Refer to X Flow and Total Display v For battery operation have relays energizing on alarm mA OUTPUT The 3 provides a mA output TB1 4 5 which can be assigned P24 to represent the measurement of flow head velocity or temperature The associated scaling P25 is factory set to a value of 0 This provides normal scaling with respect to the assigned measurement Normal scaling for representation of flow head or velocity is 0or4mA 0 20 mA maximum measurement value for P6 flow rate at maximum head P7 maximum head P10 velocity at maximum head Normal scaling for representation of temperature is 0or4 mA 40 C 20 mA 60 If custom scaling is required the 20 mA corresponding value other than 0 can be entered into P25 The range 0 to 20 or 4 to 20 mA and damping see Damping are set via P26 and P27 respectively 7ML19985AB01 Ill 30 The mA function can be overridden for test purposes by setting the desired mA value into F3 When the value is entered the mA output will go to that value When F3 is exited the mA output will revert to normal operation Also see Emulation Mode In the case of absolute calculations P4 0 P6 is calc
17. 54 114 4 5 60 127 5 0 66 140 5 5 72 152 6 0 The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM Ill 57 BS 3680 Rectangular Flume 1 U parameters required U parameters calculated UO approach width B U4 Cv U1 throat width b U5 Cd U2 hump height p U6 A U3 throat length L obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION For flows that can be calculated by the equation 2 3 x 405 Cv x Cs x Cd x Bx n where q flow rate velocity coefficient b throat width Cs shape coefficient g gravitational acceleration Cd z discharge coefficient h head RATIOMETRIC CALCULATION 1 For flows that can be calculated by the equation q Cd Cdeat X Cv Cvcai x h hcar 5 where q flow rate cal flow rate at maximum head head maximum head Cv velocity coefficient velocity coefficient for maximum head Cd discharge coefficient for head discharge coefficient for maximum head Refer to Operation Flow Calculation 7ML19985AB01 OCM Ill 58 BS 3680 RECTANGULAR FLUME 3104 x hmax L m xcd El 0 head h p The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB0
18. ATIONS Power Environmental Memory back up Range Resolution Accuracy Temperature Compensation Programming Inputs Outputs 7ML19985AB01 dc supply 9 to 30 V DC 8 W max and or ac supply 100 115 200 230 V 15 50 60 Hz 20 VA max location indoor outdoor altitude 2000 m max ambient temperature 20 to 50 C 5 to 122 F relative humidity suitable for outdoor Type 4X Nema 4X IP65 enclosure II 4 installation category pollution degree 3 V lithium battery NEDA 5003LC or equivalent operating life 1 year SuperCap capacitor for back up during battery replacement 0 3 m min to 1 2 m max 1 to 4 ft 0 6 m min to 3 m max 2 to 10 ft 0 2 mm 0 007 1 mm m calculated error less than 0 02 external sensor to compensate over the operating range via supplied programmer and communication link velocity sensor and 0 to 10 V dc 2 7 mV auxiliary head range resolution transducer drive 44 Khz 400 Vpp pulses of 0 1 msec typical duration at a 100 msec typical repetition rate instrumentation range 0 20 or 4 20 mA resolution 5 uA maximum loading 1 KQ OCM Ill isolation 300 V ac continuous relays 3 alarm control relays 1 form C SPDT contact per relay rated at 5 A at 250 V ac non inductive or 30 V dc dc output 24 V d
19. BOUT THIS About This Manual 7 About the OCM 3 7 SPECIFICATIONS 9 Programmer 10 Transducer 11 Temperature Sensor 11 Cabling 11 Communication Software 11 INSTALLATION Installing the OCM 3 13 Outline and Mounting 13 OCM 3 Layout 14 System Diagram 15 Installing the Transducer 16 Installing the Temperature Sensor 16 mA Output 17 Relays 17 Synchronization 18 Power Connections 19 Installing the Memory Back up Battery 20 Communicating Via Computer 20 Installing the Programmer 20 7ML19985AB01 OCM Ill START UP General Keypad Legend Initial Start Up Fundamental Checks OPERATION Memory Security Units Flow Calculation Display Damping Relays mA Output Fail Safe Flow rate and Totalizing Logging Blanking Temperature Time and Date Emulation Mode Reset Flow Velocity Input Auxiliary Head Input DC Output Diagnostic Aids 7ML19985AB01 Ill 21 21 22 22 25 27 27 27 28 28 29 30 30 31 31 32 34 34 34 35 35 36 36 37 37 D PARAMETER LISTING 39 F PARAMETER LISTING 41 PARAMETER LISTING 43 U PARAMETERS FOR PRIMARY ELEMENT 51 Simple Exponential Devices P3 0 53 BS 3680 Rectangular Flume P3 1 58 BS 3680 Round Nose Horizontal Crest Weir P3 2 60 BS 3680 Trapezoidal Flume P3 3 62 BS 3680 U Flume P3 4 64 BS 3680 Finite Crest Weir 5 66 BS 3680 Thin Plate Rectangular Weir P3 6 68 BS 3680 Thin Plate V Notch Weir P3 7 70 Re
20. F10 change security code F11 reset master totalizer F12 force a cold start F13 auto zero calibration F14 examine data log task view daily totals view flow rates view min max data method first day last day specified day F15 clear data log security access required 7ML19985AB01 OCM Ill 41 7ML19985AB01 OCM Ill 42 PARAMETER LISTING Refer to Operation for details PO language 0 english 1 french 2 italian 3 german 4 spanish P1 dimensional units linear velocity 0 centimetres centimetres per second 1 inches inches per second 2 feet feet per second 3 metres metres per second P2 temperature units 0 Celcius 1 Fahrenheit primary element 7ML19985AB01 0 exponential device 1 BS 3680 Rectangular Flume 2 BS 3680 Round Nose Horizontal Crest Weir 3 BS 3680 Trapezoidal Flume 4 BS 3680 U throated Flume 5 BS 3680 Finite Crest Weir 6 BS 3680 Thin Plate Rectangular Weir 7 BS 3680 Thin Plate V notch Weir 8 Rectangular Weir contracted 9 Round Pipe 10 Palmer Bowlus Flume 11 H Flume 12 Universal Head vs Flow OCM III 43 P4 P5 P6 P7 P8 P9 P10 13 Rectangular Area x Velocity 14 Trapezoidal Area x Velocity 15 Modified Trapezoidal Area x Velocity 16 U channel Area x Velocity 17 Circular Area x Velocity 18 Gull wing Area x Velocity 19 Egg shaped Area x Velocity 20 Universal Area x V
21. Instruction Manual November 2005 SIEMENS MILLTRONICS wis million in one SIEMENS Safety Guidelines Warning notices must be observed to ens ure personal safety as well as that of others and to protect the product and the connected equipment These warning notices are accompanied by a clarification of the level of caution to be ob served Qualified Personnel This device system may only be set up and operated in conjunction with this manual Qualified personnel are only authorized to install and established safety practices and standards Unit Repair and Excluded Liability The user is responsible for all changes and repairs mad agent operate this equipment in accordance with e to the device by the user or the user s All new components are to be provided by Siemens Milltronics Process Instruments Inc Restrict repair to faulty components only Do not reuse faulty components Warning This product can only function properly and safely if it is correctly transported stored installed set up operated and maintained Note Always use product in accordance with specifications Copyright Siemens M illtronics Process Disclaimer of Liability Instruments Inc 2005 All Rights Reserved This document is available in bound version and in electronic version We encourage users to purchase authorized bound manuals or to view electronic versions as designed and authored by Siemens M
22. L19985AB01 OCM Ill 91 GULL WING AREA X VELOCITY 18 U parameters required U parameters calculated UO channel base width b UA area h U1 lower angle alpha o U2 upper angle beta U3 transition height ht obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter 7ML19985AB01 OCM Ill 92 GULL WING AREA X VELOCITY transducer n Do N The transducer must be above the maximum head by least blanking value P47 7ML19985AB01 OCM Ill 93 EGG SHAPED AREA X VELOCITY 19 U parameters listed U parameters calculated UO top radius R U3 area h U1 bottom radius r 02 axial displacement d obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION For flows that can be calculated by the equation 1 1000 xAxv where q flow rate in l sec flow velocity in cm sec RATIOMETRIC CALCULATION 1 For flows that can be calculated by the equation q X A Acat X where q flow rate flow rate at hcai A cross sectional area of flow cross sectional area of flow at hcai v flow velocity Refer to Operation Flow Calculation 7ML19985AB01 OCM Ill 94 EGG SHAPED AREA X VELOCITY o transducer
23. M Ill 108 ly returns a code indicating the relay status code relay 1 2 3 0 0 0 0 1 0 0 2 0 1 0 3 1 1 0 4 0 0 1 5 1 0 1 6 0 1 1 7 1 1 1 NV start data log down load 1 data log down load start date 2 data log down load end date 7ML19985AB01 13 stop data log down load Ill 109 Modem Communication Communication with the OCM 3 over an answer back telephone modem is relatively straight forward For modem communication over conventional telephone lines a maximum of 1200 or 2400 baud is recommended Generally a lower baud rate is more reliable on noisy lines Modem should be self answering and data checking capability turn on The Milltronics Utilities software can be run via modem In addition the Terminal Emulation program of the Utilities software package can be used to send control sequences directly to the modem The remote modem is defined as the modem connected to the OCM 3 The local modem is defined as the modem connected to the computer It should be noted that the modem responses listed in the following discussion serve only to typify what is presently common in current field of RS 232 communication standard modem local modem telephone lines remote modem modem TB 1 3 7 DB 25 connector 7ML19985AB01 OCM
24. N For flows that can be calculated by the equation 2 3 x CxCpxbxh where q flow rate C a function of h and L g gravitational acceleration b crest width Cp a correction factor as a function h head of h and p applied to C RATIOMETRIC CALCULATION 1 For flows that can be calculated by the equation 9 Qcai X C Ccai X X I hca where q flow rate cal flow rate at maximum head head hcai maximum head C discharge coefficient for head discharge coefficient for maximum head Cp correction factor for C correction factor for Ceai Refer to Operation Flow Calculation 7ML19985AB01 OCM Ill 66 BS 3680 FINITE CREST WEIR transducer The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM Ill 67 BS 3680 THIN PLATE RECTANGULAR WEIR 6 U parameters required U parameters calculated UO approach width B U3 Ce U1 crest width b U4 Kp U2 crest height p obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION o For flows that can be calculated by the equation x 4 V2g x be x h9 where q flow rate Ce a function of h p b and B g gravitational acceleration be effective crest width b Ko b crest width he effective head h K
25. NTIAL DEVICES 0 U parameters required UO exponent Ui k factor 0 only Typical Exponential Devices Sutro proportional weir head measurement only Rectangular suppressed or Trapezoidal Cipolletti weir Kahfagi venturi Parshall flume Leopold Lagco Triangular V notch weir obtain from manufacturer s specifications Reference ABSOLUTE CALCULATION o For flows that can be calculated by the equation q k h where q flowrate x exponent U0 k constant factor U1 h head RATIOMETRIC CALCULATION 1 For flows that can be calculated by the equation I hca where q flowrate cal flowrate at maximum head h head heal maximum head X exponent U0 Refer to manufacturers specifications for the exponent value Refer to Operation Flow Calculation 7ML19985AB01 OCM Ill 53 SIMPLE EXPONENTIAL DEVICES 0 TYPICAL SHARP CRESTED WEIRS Typical Weir Profiles Rectangular suppressed V notch or Triangular U0 1 5 U0 2 5 r h NE Trapezoidal Cipolletti Sutro Proportional U0 1 U0z1 5 symmetrical or asymmetrical For rated flows under free flow conditions the head is measured upstream of the weir plate at a minimum distance of 3 times the maximum head i e where the liquid surface is not affected by drawdown The transducer must be above the maximum he
26. REA X VELOCITY P3 13 U parameters required U parameters calculated UO channel width B U1 area h obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION For flows that be calculated by the equation 1 1000 x BxhxV where q flow rate in B channel width in cm h head in cm V velocity in cm sec RATIOMETRIC CALCULATION 1 For flows that can be calculated by the equation q X A Acat X V Vcal where q flow rate flow rate at maximum head head maximum head velocity Velocity at maximum head Refer to Operation Flow Calculation 7ML19985AB01 OCM Ill 82 RECTANGULAR AREA X VELOCITY transducer a P The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM Ill 83 TRAPEZOIDAL AREA X VELOCITY 14 U parameters required U parameters calculated UO channel top width B U3 area h U1 channel base width b U2 channel depth ht obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION For flows that can be calculated by the equation 1 1000 x b mh xv m B byd where q flow rate l sec B channel top width cm b chann
27. TRONICS OCMIII rob 11 27 programmer S fe OCMIII Dininin 00 0900 00004 CJ CJ 4 CJ 267 mm 10 5 Qe 1 X suitable location for mounting holes conduit entrances accessed under enclosure lid 4 3 mm 0 17 Milltronics reccomends using a punch for making dia 4 places holes in enclosure Use suitable cable glands to customer mounting maintain ingress rating screw Non metallic enclosure does not provide grounding between connections Use grounding type bushings and jumpers 13 OCM Ill 7ML19985AB01 OCM 3 LAYOUT A nem 1 MILLIRONICS _ BOARDA MADENCANADA PETERBOROUGH ONTARIO R9 R10 board display Wa 1 T f er si S 8 2 Ne E F l ma cad 022 9 PINT e REO mS 9 24 u25 cad L ERE mo CS yga al 16 19 20 21 22 Oro FASTI m2 RLS 23 2418225 26 27 28 29 30 DC AC FUSE BLO MDL SLOBLO 200VAC Mevac 2 a1 22 33 35 38 s s s s
28. ad by at least the blanking value P47 7ML19985AB01 OCM Ill 54 SIMPLE EXPONENTIAL DEVICES 0 KHAFAGI VENTURI 15 cm 6 transducer front side For rated flows under free flow conditions the head is measured 15 cm 6 upstream from the beginning of the converging section The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM Ill 55 SIMPLE EXPONENTIAL DEVICES 0 TYPICAL PARSHALL FLUME plan transducer 0 1 1 head i front side For rated flows under free flow conditions the head is measured at 2 3 the length of the converging section upstream of the beginning of the throat section The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM Ill 56 SIMPLE EXPONENTIAL DEVICES 0 TYPICAL LEOPOLD LAGCO Pan 2 E gt N ae plan transducer a converging diverging point of measurement 0 c head side front For rated flows under free flow conditions the head is measured at a point upstream referenced to the beginning of the converging section Refer to the following table Flume Size Point of Measurement pipe dia in inches mm inches 4 12 25 1 0 15 32 1 3 18 38 1 5 21 44 1 8 24 51 2 1 30 64 2 5 36 76 3 0 42 89 3 5 48 102 4 0
29. alizer F14 does not use the master totalizer multiplier P32 It is possible that the daily total overflows In such a case the display will show 7ML19985AB01 OCM Ill 33 BLANKING Blanking is used to ignore the zone in front of the transducer where ringing or other false echo is at a level that interferes with the processing of the true echo The minimum blanking is factory set but can be overridden by entering the desired distance into P47 Ringing is the inherent nature of the transducer mass to continue vibrating after the transducer has been fired Ringing decays to acceptable levels in the order of milliseconds Excessive cold or over tightening of the transducer mounting may increase the ring time such that it appears as an echo during the receive cycle This is usually indicated by an incorrect high head reading Excessive ring time may be overcome by increasing the blanking TEMPERATURE The temperature as currently registered by the temperature sensor is viewed under D5 Data on the running minimum and maximum temperatures that have occurred since the last reset can be viewed in several ways F7 gives the running min max temperatures and their time and date of occurrence since the last reset F7 is reset by F8 but only after satisfying the security parameter FO D6 D7 give the respective running min max temperature data only that have occurred since they were last reset D6 is reset by entering a value lower tha
30. arge coefficient for maximum head Refer to Operation Flow Calculation 7ML19985AB01 OCM Ill 70 BS 3680 THIN PLATE V NOTCH WEIR transducer c _ 4 to 5 X hmax The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM Ill 71 RECTANGULAR WEIR CONTRACTED 8 U parameters required UO crest width b obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION For flows that be calculated by the equation Kx b 0 2h xh where q flow rate head constant RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation Qai X b 0 2h b 0 2hcai x h hea where q flow rate flow rate at maximum head h head Neal maximum head Refer to Operation Flow Calculation 7ML19985AB01 OCM Ill 72 RECTANGULAR WEIR CONTRACTED transducer 4 to 5 hmax The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM Ill 73 ROUND PIPE 9 based the Manning Formula U parameters required UO pipe inside diameter D U1 slope fall run 5 U2 roughness coefficientn obtain from manufacturer s specifications Reference ABSOLUTE CALCULATION 0 For flows that ca
31. attery is being changed COMMUNICATING VIA COMPUTER Refer to Communication INSTALLING THE PROGRAMMER To program the OCM 3 via the Programmer it must be placed into the front cover recess of the OCM 3 The back of the Programmer has a magnetic plate which will hold the programmer in place It can be removed when programming is completed 20 OCM Ill 7ML19985AB01 START UP GENERAL For the initial start up it is advisable to use the programmer for programming the OCM 3 The programmer transmits a coded infrared signal each time a key is pressed The 3 is designed to automatically scroll through the A D F P and U parameters in a structured sequence The scrolling is interactive in that depending on the option chosen for a given parameter subsequent parameters may be skipped or modified The user is thus prompted to satisfy only the parameters which are available to him for the application he has chosen KEYPAD access to A parameters initiates a printout while viewing Flow and Total Li access to D F gt CJ P and U scrolls through selected parameters parameter options scrolls Forward through negative the parameters enters content of entry field numeric entries with decimal point scrolls Backward through the parameters clears content of entry field 7ML19985AB01 OCM Ill 21 LEGEND Press t
32. c 20 mA average to 200 mA at 1 10 duty cycle max Communication RS 232 or 20 mA bipolar current loop 300 600 1200 2400 4800 9600 or 19200 baud Data Logs variable rate on 1 5 15 30 or 60 min or 24 hr 31 days minimum 2 years maximum Display illuminated liquid crystal 5 x 7 dot matrix display with 2 lines of 40 characters each Enclosure Type 4X NEMA 4X IP65 209 mm W x 285 mm H x 92 mmD 8 2 W x 11 2 H x 3 6 D polycarbonate Weight 2 3 Kg 5 1 Ib Approvals FM CSA MCERTS Class 1 open channel flow device with environment operation limits at 35 95 at 93 relative humidity Eum CERTS SIRA MC 050058 01 PROGRAMMER Enclosure general purpose 67 mm W x 100 mm H x 25 mm D 2 6 W x 4 H x 1 D ABS plastic Operating Temperature 20 to 50 5 to 122 F 7ML19985AB01 OCM III 10 Battery 9 V ANSI NEDA 1604 PP3 or equivalent or 3V lithium battery TRANSDUCER Model XRS 5 Refer to associated Transducer manual TEMPERATURE SENSOR Model TS 2 LTS 1 or LTS 1C Refer to associated Temperature Sensor manual CABLING Transducer RG 62U coaxial maximum separation 183 m 600 ft must be run in grounded metal conduit mA Output Belden 8760 or equivalent Synchronisation Belden 8760 Temperature Sensor Belden 8760 1 pair shielded twisted 18 AWG or equivalent maximum separation 183 m 600 ft can b
33. ctangular Weir Contracted P3 8 72 Round Pipe P3 9 74 Palmer Bowlus Flume P3 10 76 Flume P3 11 78 Universal Head vs Flow P3 12 80 Rectangular Area x Velocity P3 13 82 Trapezoidal Area x Velocity P3 214 84 Modified Trapezoidal Area x Velocity P3 15 86 U Channel Area x Velocity P3 16 88 Circular Area x Velocity P3 17 90 Gull Wing Area x Velocity P3 18 92 Egg Shaped Area x Velocity 219 94 Universal Area x Velocity P3 20 96 APPENDICES Maintenance 99 Error Codes 100 Communications 101 7ML19985AB01 11 7ML19985AB01 OCM Ill ABOUT THIS ABOUT THIS MANUAL Although the OCM 3 is very approachable due its dialogue capabilities and intuitive operation the user should be familiar with this manual This manual provides the user with the necessary information required to install start up and operate the OCM 3 As the OCM 3 prompts the user with specific messages in a step by step fashion during programming the Start Up section serves essentially to compliment the OCM 3 Start Up provides the user with instructions on the use of the programmer and an overview of the programming requirements The D F P and U parameters listed in the Parameters section provide a quick reference of the available programming and display parameters and their options The U parameter listing also provides mathematical and graphical details as a reference to assist the user in programm
34. curity has been satisfied access continues for 5 minutes after the last key is pressed or until F2 is re entered The security code may be changed from its factory set value 2 71828 by entering a new value into F10 It is imperative that the new value be recorded as the code can not be viewed If the code is lost consult Milltronics UNITS Programming of the OCM 3 involves setting the units of measure P1 linear and velocity P2 temperature P5 flow rate and volume If the units are changed during the course of operation the change will be effected through all associated parameters and displays and will rescale flow and total data stored in the logs 7ML19985AB01 OCM Ill 27 FLOW CALCULATION Absolute vs ratiometric The OCM 3 can be programmed to use either of two methods P4 for calculating flow from the head measurement absolute or ratiometric The result is the same regardless of the method used The principal difference is the information that must be entered in order for the OCM 3 to carry out the calculation The user s choice of method may ultimately be based upon the information which is at hand Refer to U parameters for the primary element selected for a listing of the information required For the ratiometric method it is usually sufficient that the user know the flow rate which occurs at maximum head On the other hand absolute calculations require that the user enter information such as
35. e programming and consequent flow calculation are performed as normal 7ML19985AB01 OCM Ill 36 The 0 and 100 limits of the auxiliary input must be scaled using parameters P43 and P44 select P43 enter the voltage corresponding to zero head select P44 enter the head corresponding to 5 V e g if the head output is 1 V per m and the output is scaled for 7 V at 100 head 7 m then enter 5 m If the output is scaled for 4 V at 100 head 4 m enter 5 m P43 and P44 can only be accessed if P42 has been set for head determination by an auxiliary device The input voltage level can be viewed via D13 Voltage Input Current Input 10V 0 10V VC A O U EO U M X LM X 7 1819 L EN TT TT lt o lt typical 1 5 V signal from typical 4 20 mA signal from auxiliary device auxiliary device Add terminating resistor e g 250 for 1 5 V over 20 mA Signal must be positive with respect to ground Auxiliary Input additional to Basic Wiring DC OUTPUT The 3 provides 24 V DC output that can be used to supply power to a remote customer device The output is not isolated from the DC rails that supply the OCM 3 electronics and no overload protection is provided As such the output must not operate beyond its specified capacity DIAGNOSTIC AIDS D15 through D18 are diagnostic aids to Milltro
36. e run in conduit with transducer cable Communication RS 232 Belden 8770 3 wire shielded 24 AWG or equivalent maximum separation 15 m 50 ft Bipolar Current Belden 9552 2 pair shielded twisted 18 AWG or equivalent maximum separation 1 500 m 5 000 ft Note The XRS 5 must be used with the TS 2 external temperature sensor when operating with the OCM 3 Velocity Input Belden 8760 or equivalent 7ML19985AB01 OCM Ill 11 Auxiliary Input Belden 8760 or equivalent 24 V Output Belden 8760 COMMUNICATION SOFTWARE Milltronics Utilities Software on standard PC floppy disk for DOS 3 1 and up 7ML19985AB01 OCM Ill 12 INSTALLATION Installation shall only be performed by qualified personnel and in accordance with local governing regulations INSTALLING THE OCM 3 The OCM 3 should be mounted in a clean dry area that is within the ambient temperature range and suitable for the specified enclosure The front cover should be accessible for programming and viewing It is advisable to keep the OCM 3 away from high voltage or current runs contactors and SCR control drives Do not mount the OCM 3 in direct sunlight without the use of a sun shield This product is susceptible to electrostatic shock Follow proper grounding procedures OUTLINE AND MOUNTING 209 mm 8 2 106 mm 0 6 172 pe m i laces FS 6 8 3 6 Oe e S MILE
37. ed using parameters P8 and P9 select P8 enter the voltage corresponding to zero velocity select P9 enter the velocity corresponding to 5 V e g If the velocity sensor output is 1 V per m sec and the output is scaled for 7 V at 100 6 velocity 7 m sec then enter 5 m sec If the output is scaled for 4 V at 100 velocity 4 m sec enter 5 nvsec P8 and P9 can only be accessed if P3 has been set for an option that requires the use of a velocity input The input voltage level can be viewed via D12 Voltage Input Current Input 0 10V 0 10V EOU E OU M X LM X 7 9 SR E DNE g typical 1 5 V signal from typical 4 20 mA signal from velocity sensor velocity sensor Add terminating resistor e g 250 Q for 1 5 V over 4 20 mA Signal must be positive with respect to ground Velocity Input additional to Basic Wiring AUXILIARY HEAD INPUT In some applications the transducer input TB1 1 2 is not used to provide a signal for head measurement A typical example of this is an application which is beyond the 3 m 10 ft range of the OCM 3 In such a case the head could be derived from another Milltronics level monitor or other compatible device The method of head determination is set by P42 The OCM 3 simply substitutes the signal from the auxiliary device for the ultrasonic measurement provided by the transducer Th
38. el bottom width cm d depth of channel cm head cm v flow velocity cm sec RATIOMETRIC CALCULATION 1 For flows that can be calculated by the equation q X A Acai X A b mh xh 6 Mheai X hear m B byd where q flow rate l sec B channel top width cm b channel bottom width cm d depth of channel cm h z head cm v flow velocity cm sec Refer to Operation Flow Calculation 7ML19985AB01 Ill 84 TRAPEZOIDAL AREA X VELOCITY transducer The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM Ill 85 MODIFIED TRAPEZOIDAL AREA X VELOCITY P3 15 U parameters listed U parameters calculated UO channel top width B U3 area h U1 channel base width b U2 transition height ht obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION P4 0 For flows that can be calculated by the equation 1 1000 6 mh forh lt d 1 1000 x b B h d xv forh2d m B b d where q flow rate 5 height of transition cm B channel top width cm head cm b channel base width cm v flow velocity cm sec RATIOMETRIC CALCULATION 1 For flows that can be calculated by the equation q X X forh lt d Az b mh xh
39. elocity method of calculation 0 absolute 1 ratiometric flow rate units flowrate 0 litres per second litres 1 cubic feet per second 2 imperial gallons per minute 3 U S gallons per minute 4 imperial million gallons per day 5 U S million gallons per day 6 cubic metres per hour 7 cubic metres per day flow at maximum head height of maximum head volts in at zero velocity velocity at 5 volts in velocity at maximum flow 7ML19985AB01 OCM Ill volume cubic feet imperial gallons U S gallons imperial million gallons U S million gallons cubic metres cubic metres 44 P13 display damping 0 off 1 low 2 med 3 high P14 display lighting P15 P18 P21 7ML19985AB01 1 auto off 2 off relay 1 2 3 assignment 0 not in service 1 de energize on loss of echo 2 energize on loss of echo 3 de energize on high flow rate 4 energize on high flow rate 5 de energize on low flow rate 6 energize on low flow rate 7 de energize on high head 8 energize on high head 9 de energize on low head 10 energize on low head 11 de energize on high velocity 12 energize on high velocity 13 de energize on low velocity 14 energize on low velocity 15 de energize on high analog 16 energize on high analog 17 de energize on low analog 18 energize on low analog 19 de energize on low D11 volts 20 energize on low D11 volts 21 de
40. enter the current head The OCM 3 calculates P46 and automatically enters the value e g 160 CJ 5 2 F13 auto zero calibration 160 F13 auto zero calibration 0 completed 7ML19985AB01 OCM Ill 23 If data logging is desired the time and date must be set SAOB F4 24 hr time e g 1141 11 41 a m seconds are always assumed to be 00 F4 24 hr time Sa FA 24 hr time time is displayed in 11 41 00 enter new time hh mm ss F5 ddmmyyyy date e g 12101492 October 12 1492 gt 2 9009 202 F5 ddmmyyyy date 12 10 1492 enter new date The start up procedure is now complete Enter F2 to place the OCM 3 in the normal operating mode FLOW units RELAY 123 TOTAL units STATE Note To save parameter values return to RUN mode F2 after programming The 3 now displays the flow rate and total Refer to Operation Display 7ML19985AB01 OCM Ill 24 FUNDAMENTAL CHECKS For accurate determination of flowrate accurate head measurement is essential Check the following and correct if necessary check D5 for correct temperature at transducer location check 09 for correct distance from transducer to head check DO for accurate head measurement 7ML19985AB01 OCM Ill 25 7ML19985AB01 OCM Ill 26 OPERATION Upon power up the transducer is fired periodically as set by P36 A long interval bet
41. eter F1 The head is entered and the corresponding flow is displayed This function is useful when troubleshooting discrepancies between the OCM 3 calculation and the expected flow Relays assigned to functions associated with the emulation parameter respond to the emulated flows The mA output does not track the emulated flows when P28 mA output emulation 0 However if it is required to do so then the emulator parameter should be set to 1 RESET The following resets can only be executed after satisfying the security access FO Cold Start If it is desired to reset all parameters logs and totalizers to their factory setting this is done by forcing a cold start F12 Master Totalizer If it is desired to reset the master totalizer F2 this is done by parameter F11 Data Log If it is desired to reset the data log F14 this is done by parameter F15 Min Max Log If it is desired to reset the min max log F7 this is done by parameter F8 7ML19985AB01 11 35 FLOW VELOCITY INPUT In some applications the flow calculation for the chosen primary element requires a velocity input In this type of application the transducer measurement is used to calculate the cross sectional area of the flow By multiplying the area with the distance per time units of velocity the volume per time units of flow are calculated The calculated velocity can be viewed via D8 The 0 and 100 limits of the velocity input must be scal
42. he associated programmer key Display shown on OCM 3 MILLTRONICS OCM II Copyright Milltronics 1992 Programmer key 4 INITIAL START UP After installation procedures have been completed the OCM 3 may be powered up Upon initial powering up the unit momentarily displays Initializing and then scrolls through the available languages 0 language English iz 1 LANGAGE FRANCAIS 2 LINGUA M 3 LANDESSPRACHE f DEUTSCH 4 IDIOMA ESPANOL The 3 is asking which language you prefer to communicate in English language selected 0 language English Si advance to FO FO lt enter security code 7ML19985AB01 OCM Ill 22 C63 7 3 3 3 9 factory s t sacurity 2 71828 must be entered if the wrong language was selected it may PO 0 language English be changed here P1 dimensional units 0 centimeters P2 temperature units continue programming entering the desired options ay ADVANCE and advancing until the scroll returns to PO It is then assumed that the P47 banking distance user has entered all the 61 01694 lt centimeters required parameters PO 0 language English For optimum calibration accuracy an F13 should be performed prior to accessing F2 the normal operating mode F13 auto zero calibration
43. hting to off or auto The OCM 3 provides two separate damping functions reading and mA output Zero or no damping allows fastest response while high or 100 provides the slowest response The damping is usually set to provide a reliable response without sacrificing stability The reading damping P13 dampens only the flow rate reading of the Flow and Total display F2 The damping selections are off low medium and high Relay functions associated with flow rate respond to the dampened reading values mA output damping P27 dampens the change in the mA output The parameter entry is in seconds for spanning the 0 to 100 of the mA range selected P26 Displays and relay functions associated with the mA output respond to its dampened value 7ML19985AB01 OCM Ill 29 RELAYS Three on board multipurpose relays are provided by the OCM 3 P15 18 and 21 set the respective functions for relays 1 2 and 3 Depending on the function selected these parameters determine the need and configuration of the subsequent relay control parameters P16 17 relay 1 P19 20 relay 2 and P22 23 relay 3 If the relay is to function as a driver for a remote totalizer or as a flow sampler contact the totalizer multiplier P32 will be factored by the setpoint Note that parameters P16 P19 and P22 will default to zero When a relay is set to totalizer P32 you must have the applicable parameter P16 for relay 1 P19 for relay 2 or P22 for relay
44. illtronics Process Instruments Inc Siemens Milltronics Process Instruments Inc will not be responsible for the contents of partial or whole reproductions of either bound or electronic versions While we have verified the contents of this manual for agreement with the instrumentation described variations remain possible Thus we cannot guarantee full agreement The contents of this manual are regularly reviewed and corrections are included in subsequent editions We welcome all suggestions for improvement Technical data subject to change MILLTRONICS is a registered trademark of Siemens Milltronics Process Instruments Inc Contact SM PI Technical Publications at the following address Technical Publications Siemens Milltronics Process Instruments Inc 1954 Technology Drive Box 4225 Peterborough Ontario Canada K9J 7B1 Email techpubs smpi siemens com For a selection of Siemens Milltronics level measurement manuals go to WWwW Siemens com processautomation Under Process Instrumentation select Leve Measurement and then go to the manual archive listed under the product family For a selection of Siemens Milltronics weighing manuals to www siemens com processautomation Under Weighing Technology select Continuous Weighing Systems and then go to the manual archive listed under the product family Siemens Milltronics Process Instruments Inc 2005 TABLE OF CONTENTS TITLE PAGE A
45. ing the OCM 3 to the primary element being used The user is urged to rely on the manufacturer s specification for obtaining and identifying the primary element to which the 3 is being applied In short If you want to know about Read the product About This Specifications getting started Installation Start Up how it works Operation Parameters Appendices ABOUT THE OCM 3 The OCM 3 is to be used only in the manner outlined in this instruction manual The Milltronics OCM 3 Open Channel Meter is an electronic instrument designed to measure flow in open channels It is housed in a polycarbonate enclosure and comes with a removable programmer As a system it is used in conjunction with a remote ultrasonic transducer or auxiliary head measurement device and a temperature sensor The 3 transmits a pulse signal to the transducer which is then emitted as ultrasonic pulses The pulses echo off the water surface and are then sensed by the transducer The time for a pulse to echo back from the water surface is temperature compensated and converted into a measurement of head 7ML19985AB01 OCM Ill 7 The OCM 3 converts the head measurement into flow rate but also provides a velocity sensor input for applications where a flow velocity measurement is required to perform the flow calculation The flow rate is totalized and stored in a comprehensive data log to provide detailed flow analysis Programming of the OCM 3 allow
46. lar current Milltronics CVCC Milltronics communication Maximum system capability Not all components or their maximum quantity may be required 15 OCM Ill 7ML1 9988 6806 INSTALLING THE TRANSDUCER TRANSDUCER Max cable run 183 m 600 ft of RG 62U or equivalent Cable must be run in a grounded metal conduit with no other cabling except Temp Sensor cable Ground shield at OCM 3 only OCM 3 TB 1 Insulate shield at junctions to prevent inadvertent grounding Basic Wiring Transducer Hazardous voltage present transducer terminals during operation Note When using the XRS 5 transducer with the OCM 3 use the TS 2 external temperature sensor The internal temperature sensor in the XRS 5 cannot be used INSTALLING THE TEMPERATURE SENSOR TEMP In order to compensate for uniform SENSOR temperature change in the air BW between the transducer and the flow LHL surface the temperature sensor must be connected to the 3 pea 14 15 16 TB 1 Maximum cable run 183 m 600 ft of Beldon 8760 1 pair shielded twisted 18 AWG or equivalent Temperature sensor cable can be run with the transducer cable in a grounded metal conduit Ground shield at OCM 3 only Basic Wiring Temperature Sensor 16 OCM Ill 7ML19985AB01 mA OUTPUT CURRENT O P S H L ages 1 5 617 hohy isolated 0 or 4 to 20 mA output P26 into 1 load maximum Wiring
47. le number invalid date invalid time can t zero auxiliary device b must be greater than R r Ill 100 COMMUNICATIONS The 3 provides serial communication either through Milltronics proprietary bipolar current loop or industry standard RS 232 Communication can be used to provide a video or paper printout of OCM activity It can also be used to provide remote programming and retrieval of the data log from devices such as computers and PLCs When using the bipolar current loop communication runs of up to 1 500 m can be achieved as opposed to the limited runs of 15 m using RS 232 By terminating the bipolar current loop with a Milltronics CVCC the communication format is then converted to RS 232 OCM 3 site number customers computer _ customer s computer Milltronics OCM 3 Utilities Software available provides conversion to RS 232 or 422 7ML19985AB01 OCM Ill Milltronics provides a standard Utilities software package for convenient communication between an IBM PC compatible computer and the OCM 3 In addition the user may opt to develop his own custom software program to perform tasks suited to his specific needs Protocol The protocol for the OCM 3 is as follows baud rate set via P37 parity none stop bits 1 word length 8 The OCM 3 uses a three wire XON XOFF serial communication link When the 3 5 receive buffer is near full the OCM 3 sends an XOFF sig
48. lities Software 7ML19985AB01 11 104 Milltronics Utilities Software Disk The Milltronics Utilities Software expands the human interface capabilities of the OCM 3 as compared to that provided by the simple use of the infra red programmer Utilities Software remote OCM 3 programming remote OCM 3 display saving OCM 3 program parameters retrieving log data creating spread sheet data log file creating ASCII text data log file emulating serial printer graphic flow rate display 7ML19985AB01 OCM Ill Programmer local programming local display 105 The 3 Utilities software provided by Milltronics uses XON XOFF to ensure communication reliability The software is written to be executed on an IBM PC compatible computer The standard keyboard emulates the OCM 3 programmer Pressing the keys corresponding to those displayed on the programmer will activate the same function see Start Up Keypad In addition special functions are provided using the and v keys found on keyboard For additional information refer to the README DOC file provided on the disk omm OOOH ninini Biy 81 7ML19985AB01 OCM Ill 106 Custom Programming and Third Party Communication Program Users who wish to write their own software to communicate with the OCM 3 are urged to implement a fully buffered interru
49. ly for applications using velocity input When the output is directed to a serial printer a delay is inserted between each line to allow the printer time to print each line before another is sent In that way the simplest of printers may be used without need of XON OFF or hardware handshaking only a three wire connection is required The printer must be at least 40 columns wide The OCM 3 sends text in upper and lower case The printer must support both upper and lower case or else treat lower case as if it had been sent in upper case The printing interval must divide evenly into the selected units of time for printing to occur at regular intervals e g 1 printer mode set for interval in minutes P35 7 print interval set for 7 minutes Printing starts at 7 minutes after the hour and will occur every 7 minutes thereafter until 56 minutes into the hour The next print out would not occur until 7 minutes into the next hour Since the port used for communication is the same as used for normal serial communication a software switch controls whether or not the display is sent out on the serial port The switch is controlled by typing v to allow data transmission to stop it The Milltronics printer emulation program does this automatically If the OCM 3 is connected to a computer programmed for printer emulation the computer will receive the print out data and display it on the video terminal refer to Milltronics Uti
50. n h head Kn 1 mm RATIOMETRIC CALCULATION 1 For flows that can be calculated by the equation X x I hoa 9 where q flow rate cal flow rate at maximum head head maximum head Ce z discharge coefficient for head discharge coefficient for maximum head Refer to Operation Flow Calculation 7ML19985AB01 OCM Ill 68 BS 3680 THIN PLATE RECTANGULAR WEIR transducer 4 to 5 X hmax The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM Ill 69 BS 3680 THIN PLATE V NOTCH WEIR 7 U parameters required U parameters calculated UO notch angle alpha U1 Ce obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION For flows that can be calculated by the equation x 8 15 x tan oJ2 x 29 x h where q flow rate h head g gravitational acceleration Ce function of h and a notch angle alpha angle is restricted to 90 53 133 or 28 066 Otherwise use ratiometric calculation RATIOMETRIC CALCULATION 1 For flows that can be calculated by the equation q X x where q flow rate cal flow rate at maximum head head maximum head Ce z discharge coefficient for head disch
51. n D5 and D7 is reset by entering a value larger than D5 D6 and D7 will then adopt the current temperature value and track the min max values from that point on The security parameter FO does not need to be satisfied in order to reset D6 07 Temperature data specific to the time and date can be viewed under the data log F14 see 1 Logging D14 indicates the resistance of the temperature sensor corresponding to the temperature shown in D5 TIME AND DATE If the data logging features of the OCM 3 are to be used the time F4 and date F5 must be set The day starts at 00 00 00 and ends at 23 59 59 Adjusting the Time If the clock time is advanced beyond the next anticipated logging time the entry for each missed logging time is filled with a code which indicates that the system was not able to make entries at those times The daily total will be reduced proportional to the amount of time the day was shortened If the clock time is set back beyond the preceding logging time the previously logged date will be written over with new data as the logging proceeds 7ML19985AB01 11 34 The daily total will be increased proportional to the amount of time the day was lengthened Adjusting the Date If the calendar is reset the OCM 3 will adjust the log dates accordingly taking into account leap years and days per month EMULATION MODE The flow calculation P3 P4 can be checked for accuracy by using the emulation param
52. n be calculated by the equation q K n x f h x 505 where q flow rate h head constant f h Ax 5 66 cross sectional area hydraulic radius S slope of hydraulic gradient n roughness coefficient RATIOMETRIC CALCULATION 1 For flows that can be calculated by the equation cal X f h f hca where q flow rate flow rate at maximum head Refer to Operation Flow Calculation 7ML19985AB01 OCM Ill h head Neal maximum head 74 ROUND PIPE transducer This dimension should be at least 15 cm 6 shorter than the blanking value P47 The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM Ill 75 PALMER BOWLUS FLUME 10 U parameters required UO z maximum flume width hmax typically those manufactured by Warminster or Plasti Fab obtain from manufacturer s specifications Reference RATIOMETRIC CALCULATION 1 For flows that can be calculated by the equation cal X f h hmax f hca hmax where q flow rate flow rate at maximum head head maximum head f h hmax is determined by polynomial synthesis Refer to Operation Y Flow Calculation 7ML19985AB01 OCM Ill 76 PALMER BOWLUS FLUME D 2 point of measurement transducer D pipe or sewer diameter for ra
53. nal to tell the sender of the near full condition If the sender is also using XON XOFF it will respond to the XOFF signal by suspending its transmission Similarly when the OCM 3 receive buffer is near empty the OCM 3 sends an XON signal to tell the sender that it is safe to resume sending The communication baud rate of the OCM 3 and its correspondent must be the same 7ML19985AB01 OCM Ill 102 Interconnection Bipolar Current BIPOLAR IO S S H RRH TT L OCM 3 TB 3 6 7 8 2 10 refer to CVCC instruction pn 112131415 67 manual for M AS connection to T S R C computer R H E A E C M N E M S L O M D V N RS 232 IBM PC Computer Connection RS 232 RS 232 1 0 1 0 T X X0 X XO OOM 3 MAII 1 1 215 817 3 n computer serial port computer serial port DB 9 connector DB 25 connector NEC NE 12345678 90103 00044004 000000 00000 6 7 8 9 14 15 16 17 18 19 200 21 22 2B 24 25 7ML19985AB01 OCM Ill 103 Timed Print Out The 3 can be programmed to periodically print out data P34 35 A typical print out will have the following format Time hh mm ss Date dd mm yy Site Number Head units Velocity units Temperature units Flow Rate units Flow Total units on
54. nics service personnel when troubleshooting system problems D18 also serves as a performance indicator by displaying the number of valid echos received as a percentage of the number of pulses being fired by the transducer A low value indicates that a large proportion of the pulses fired are not producing valid echos In such instances the transducer should be checked for proper mounting and aiming or the transducer wiring checked for excessive noise If the value is zero shorted or opened transducer wiring may be suspect 7ML19985AB01 OCM Ill 37 D PARAMETER LISTING Refer to Operation for details DO head D1 flow rate D2 short total D3 maximum flow rate D4 minimum flow rate D5 temperature D6 maximum temperature D7 minimum temperature D8 velocity D9 nominal target range D10 analog milliamps D11 internal DC volts D12 velocity volts D13 auxiliary input volts D14 temperature sensor ohms D15 self test checksum D16 restarts D17 exceptions D18 valid echos per 100 security access required M applicable to flow calculations requiring velocity sensor 7ML19985AB01 OCM Ill 39 7ML19985AB01 OCM Ill 40 F PARAMETER LISTING Refer to Operation for details FO enter security code F1 emulation mode F2 run mode F3 keypad to mA output F4 show time set time F5 show date set date F6 software identification number F7 view min max data F8 reset min max data F9 self check
55. nt A0 A1 generally being at 0 head and the last point A2n 2 A2n 1 generally being at maximum head U parameters required UO number of data points n 4 to 16 Aeven head Aoda flow rate obtain from manufacturer s specifications Reference RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation cal X f h f hcai where f h and are polynomials based on interpolation of data points Refer to Operation Y Flow Calculation 7ML19985AB01 OCM Ill 80 UNIVERSAL HEAD vs FLOW e g typical compound weir m um Parameters 00 11 A0 0 head point 1 A12 1 05 head point 7 1 0 flow point 1 A13 2 65 flow point 7 A2 0 3 head point 2 A14 1 2 head point 8 0 1 flow point 2 15 3 4 flow point 8 A4 0 6 head point 3 A16 1 4 head point 9 A5 0 7 flow point 3 17 5 0 flow point 9 0 8 head point 4 A18 1 7 head point 10 A7 21 5 flow point 4 19 8 0 flow point 10 8 0 95 head point 5 20 2 head point 11 9 2 25 flow point 5 A21 11 8 flow point 11 A10 1 head point 6 A11 2 5 flow point 6 12 odd 10 5 A 4 02 04 06 0 8 1 1 2 14 1 6 1 8 2 even 2 For best accuracy concentrate data points where changes in flow rate the greatest 7ML19985AB01 OCM Ill 81 RECTANGULAR A
56. od The viewing tasks are daily flow totals flow rates and min max flow data for flow or temperature The viewing methods are by first entry by last entry and by specified date The scrolling keys are used to maneuver through the tasks methods and time of day 7ML19985AB01 32 Viewing the data log F14 lt examine data lo9 select Task return to parameter base display Task View Daily Totals tj a gt Task 8 View Flow Rates View Min Max Data BRE Method begin with first entry gt Deanna Method begin with last entry select return to Method select Task display Task Foose La Task Method begin with specified date enter ddmmyyyy date view return to selected select Method entry display Daily Totals Flow Rates Min Max Data display OR display OR displays Day s total 4 units Av9 d Flow Rate units Maximum Flow units Time and Date hh mm dd mm yyy Time and Date hh mm dd mmv vyyy Time and Date hh mm _ dd mmyvyyy L1 D Minimum Flow Time and Date hh mm units dd mm yyyy Maximum Temp Time and Date hh mm I units dd mm yyyy Minimum Temp Time and Date _ hh mm units dd mm yyyy The day tot
57. pt driven serial link incorporating XON XOFF Some users however will not have the capacity for such an undertaking Those users may still communicate with the OCM 3 using the less sophisticated communication capabilities provided by such high level languages as Basic Pascal or C The only restriction imposed by using a system that does not use XON XOFF is that the user must insure that he does not send long streams of commands to the OCM 3 without pausing periodically to allow the OCM 3 time to process them Most users who wish to write their own software to communicate with the OCM 3 will do so for a specific purpose An example would be to create a customized data log For this the user will want that only the numeric values be returned and none of the descriptive information To achieve this the OCM 3 provides a secondary command parser which is accessed when the OCM 3 receives a command enclosed by 7 When the leading is detected by the primary parser the OCM 3 diverts the message to the secondary parser The secondary parser remains in control until it receives the trailing 7 If the trailing 7 is not received within a few seconds the secondary parser is aborted and control is reverted to the primary parser automatically The OCM 3 response message to a command to the secondary parser is a sequence of ASCII characters terminated by an ASCII carriage return hex 00 and an ASCII line feed hex 0A All system parameters and most o
58. s the operator to select the flow calculation specific to the primary measuring device flume weir or pipe Special emphasis has been placed on providing the most accurate flow calculations possible To this end specific routines have been written to comply with the British Standards Institute s Specifications BS 3680 These routines calculate correction factors taking into account second order effects such as approach velocity and boundary layer In the event that flow measurement is not covered by one of the flow calculations provided the OCM 3 can be programmed for flow measurement using one of the universal flow calculations The 3 provides serial communication for remote programming data log retrieval and print out for devices such as computers PLCs and printers Milltronics provides a standard utilities software package for OCM 3 programming remote display and data retrieval However the user is not limited to the software provided The user can develop his own software program to perform tasks suited to his specific needs The 3 features multi field illuminated LCD for Flow and Total and Relay Status display V 0 or 4 to 20 mA output v three multipurpose relays including remote totalization 1 to 24 months data log subject to logging rate extensive serial communication including RS 232 4 removable infra red programmer AC and DC bi current operation 7ML19985AB01 11 8 SPECIFIC
59. ted flows under free flow conditions The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM Ill 77 H FLUME 11 U parameters required UO maximum listed head hmax as developed by the U S Department of Agriculture Soil Conservation Service obtain from manufacturer s specifications Reference RATIOMETRIC CALCULATION 17 For flows that can be calculated by the equation Qai X f h hmax f hca hmax where q flow rate flow rate at maximum head f h hmax and f hca hmax are determined by polynomial synthesis Refer to Operation Y Flow Calculation 7ML19985AB01 OCM Ill 78 H FLUME transducer point of measurement side For rated flows under free flow conditions the head is measured at a point downstream from the flume entrance Refer to the following table Flume Size Point of Measurement D feet cm inches 0 5 4 7 1 88 0 75 6 7 2 69 1 0 9 1 3 63 1 5 13 5 5 38 2 0 17 9 7 19 2 5 22 5 9 00 3 0 27 2 10 88 4 5 40 5 16 19 The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM Ill 79 UNIVERSAL HEAD vs FLOW P3 12 The flow curve is characterized by entering the head Aeven and flow Aoda ordinates for the number of data points n 4 to 16 over the flow range The first poi
60. terval to be in minutes 2 interval to be in hours 3 print once each day P35 printer timing P36 measurement interval 021 sec 1 15 sec 2 30 sec 321 min 4 5 P37 serial data rate 0 2 300 baud 1 600 2 1200 3 2400 4 4800 5 9600 6 19200 P38 site number 7ML19985AB01 OCM Ill 48 P39 data logging rate fixed 0 2 1 min 3 30 1 5 4 60 2 15 5z24hr variable condition 6 15 1 min flow min 19 60 1 flow 7215 5 20 60 5 x 8230 1 21224hr 1min 9 30 5 22 24 5 10 60 1 i 23 2 24 hr 15 min 11260 5 24 15 1 min head 12 24 1 13 24 5 14 24 hr 15 15 15 1 flow 16 15 5 17 2 30 1 E 18 30 5 T P40 log rapid setpoint P39 variable logging condition flow min flow head P41 log normal setpoint P39 variable logging condition flow min flow head 7ML19985AB01 25 15 5 26 30 1 27 230 5 28 60 1 29 60 5 30 24hr 1min 31224hr 5 min 32 2 24 hr 15 min units change of maximum flow per minute of maximum flow of maximum head units change of maximum flow per minute of maximum flow of maximum head Ill 49 P42 head determination 0 by OCM 3 1 by auxiliary device P43 volts in for zero head P44 head at 5 volts in P45 low flow cut off head P46 range at zero head P47 blanking distance 7ML19985AB01 OCM Ill 50
61. ther responses are floating point numbers with a maximum of 6 decimal places e g typical OCM 3 response display value message 0 0 000000 99 123 99 123000 7ML19985AB01 Ill 107 The following is a list of commands for the secondary parser Command Response the content of a where a P and U 0 through 9 e g P5 the content of P5 D parameters are the only parameters which may be altered through the secondary command parser which bypasses the security parameter FO This may be useful for example in periodically reading and then resetting the short total D2 The protocol for altering the value of a D parameter via the secondary parser is dn where n is parameter number 1 the value stored in the parameter e g d4 50 this sets the minimum flow rate to 50 for D4 It0 totalizer value similar to that of the Flow and Total F2 display except that the multiplier is not displayed It1 totalizer value returned as a floating point number with a maximum of 6 decimal places modified to include the effect of the totalizer multiplier e g if the OCM 3 display shows 00005678 x 100 the response would be 567800 000000 121 retums the current 24 hour time hh mm ss It3 returns the current date dd mm yy returns the current flow rate this is similar to the OCM 3 parameter F2 display however it is not subject to truncation to less than 6 decimal places 7ML19985AB01 OC
62. ulated by the OCM 3 FAIL SAFE In the event of an echo loss the fail safe timer will begin counting If the echo loss duration surpasses that of the time set P29 a Echo alert will be displayed in the Status field see Display The mA output will respond P30 by either holding the last value or immediately going to a predetermined value P31 The head and derived flow will hold their last value and totalization and logging will continue based on that value Upon resumption of a valid echo the mA output will return to a value corresponding to the present value of the measurement assigned at the mA damping rate P27 FLOW RATE AND TOTALIZING Flow rate Calculation of the flow rate is ongoing It is normally viewed under the Flow and Total display F2 with the decimal point set per P33 It can also be viewed under D1 as the raw flow calculation Data on the running minimum and maximum flows that have occurred since the last reset can be viewed in two ways F7 gives the running min max flows and their time and date of occurrence since the last reset F7 is reset by F8 but only after satisfying the security parameter FO D3 D4 give the respective running min max flow data only that have occurred since they were last reset D3 D4 are reset simultaneously by entering 0 into either or D4 and 04 will then adopt the current flow rate and track the running min max values from that point on The security parameter
63. ween measurements may be desirable in order to conserve power when operating the OCM 3 from a DC source of limited capacity The echo is processed to determine the head DO The flow rate D1 is calculated by the OCM 3 as a mathematical function P3 and P4 of head or a function of head and velocity P42 The flow rate is then integrated to yield the totalized flow D2 The Flow and Total fields which are displayed during the normal running mode F2 are also continuously updated Viewing or changing the content of a parameter except F1 emulation is done without disturbing the acquisition processing or logging of flow data see Y Security restricted usage of display lighting P14 relays P15 18 amp 21 mA output and communications will also conserve power MEMORY During a power interruption the memory back up will hold the programming the log and the totalizer values and run the clock The memory battery B1 provides up to one year of memory retention see Appendices Y Maintenance Note To save parameter values return to RUN mode F2 after programming SECURITY The content of all A D F P and U parameters can be viewed without having to satisfy the security parameter FO However if it is desired to change the content of any of these parameters the security parameter must be satisfied except for resetting the running min max displays parameters D3 D4 and 06 07 Once se
64. wer from the dc supply AC POWER 20 psv 230v 2 OFF 100 V ae switch shown in BG OFF position L2 N select appropriate 1 voltage OCM 3 Tai 3435 36 100 115 200 230 V ac 50 60 Hz select voltage via switch on board B The equipment must be protected by a 15 A fuse or circuit breaker in the building installation A circuit breaker or switch in the building installation marked as the disconnect switch shall be in close proximity to the equipment and within easy reach of the operator DC POWER INPUT POWER 9 30V T OCM 3 Tel A 2324 34 negative dc input TB1 24 is 9 to 30 Volt tied to ground TB1 34 dc input dc terminals shall be supplied from SELV source in accordance with IEC 1010 1 Annex H 19 OCM Ill 7ML19985AB01 INSTALLING THE MEMORY BACK UP BATTERY Disconnect power before installing or replacing the battery Do not install the memory back up battery until the OCM 3 is to be used The unit is supplied with one battery package Remove the battery from the package and insert it into the battery socket Refer to Operation Memory The memory battery B1 see Specifications should be replaced yearly to insure memory back up during lengthy power outages An on board capacitor provides one hour of memory retention in order to preserve the memory while the b

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