DCA-ED - Moore Industries International
Contents
1. moore INDUSTRIES May1990 DCA ED Direct Current Alarm Eurocard style with Display USER S MANUAL No 192 762 00B 1990 by Moore Industries International Inc Table of Contents Introduction Description Calibration Installation Operation Theory of Operation Maintenance Troubleshooting A85 DELIVERY PR NS UnitedStates Canada TOLLFREE 1 800 999 2900 16650 Schoenborn Street Sepulveda California 91343 U S A Tel 818 894 7111 65 1322 FAX 818 891 3297 CONNECT MacNet MIISEPULVEDA ited Kingdom 18 Royce Road Crawley United Kingda W Sussex RH10 2NX United Kingdom FREEPHONE Tel 0293 514488 Tlx 87667 0800525107 FAX 0293 36852 Australia 3 18 Resolution Drive Caringbah TOLLFREE New South Wales 2229 Australia Tel 02 525 9177 Tlx 790 75914 008251928 02 FAX 02 525 7296 14 14 14 Moore Industries Center has a wide variety of quality instrumentation in stock and ready to ship e Signal Transmitters Temperature Transmitters e P I and I P Converters e Isolators and Converters e Indicators and Displays e Alarm Trips e Integrators and Totalizers e Power Transducers e Instrument Power Supplies e Racks Rails and Enclosures Most instruments can be customized to meet your needs Even then you ll never have to wait more than a few days Moore Industries R Ask for the STAR Center S T C2. CONNECTOR TO DIN 41612 FIG 07 EUROCARD RACK Figure 7 DCA ED Outline Dimensions 19 01 in 483mm 18 31 in 465 10mm Ll 1680in Lap 8 13 ie 426 70mm 206 5mm 2 25 in 5 22 in y 5710mm 132 5mm 148 in A 37 70mm T Figure 8 EU Rack Mounting Dimensions Page 11 DCA ED Table 3 DCA ED Connector Pins for Units with Single Alarm NC K1 1 NO K1 1 COM K1 2 COM K1 1 NC K1 2 REF NO K1 2 DC 24 DCC COMMON Page 12 DCA ED Table 4 DCA ED Connector Pins for Units with Single Input Dual Alarms NC K1 1 NO K1 1 COM K1 2 COM K1 1 NC K1 2 REF NO K1 2 NC K2 1 COM K2 2 NO K2 1 NO K2 2 COM 2 1 NC K2 2 DC 24 DCC COMMON Page 13 DCA ED Table 5 DCA ED Connector Pins for Units with Dual Input Dual Alarms IN CHANNEL A MR CHANNEL A IN CHANNEL A MR CHANNEL A TX CHANNEL A NC K1 1 NO K1 1 COM K1 2 COM K1 1 NC K1 2 REF CHANNEL A NO 1 2 NC K2 1 COM K2 2 NO K2 1 NO K2 2 COM 2 1 NC K2 2 IN CHANNEL B REF CHANNEL B MR CHANNEL B IN CHANNEL B DC 24 MR CHANNEL B DCC COMMON TX CHANNEL B Page 14 DCA ED Theory of Operation This section describes the unit operation The functional description is based on the block diagr
3. DUAL ALARM O gt POINT O gt lt imoore INDUSTRIES POINT gt TRIP A INA IN B TRIP B Figure 2 Front Panel Controls and Indicators All Models Calibration Equipment Calibration equipment is listed in table 2 This equipment is not supplied with the unit and must be provided by the user Calibration Setup Off line calibration for all DCA ED units generally requires the same test equipment setup Three separate configurations are shown for clarity The calibration setup for single input single alarm units is shown in figure 3 The calibration setup for single input dual alarm units is shown in figure 4 The calibration setup for dual input dual alarms DI option units is shown in figure 5 At the factory units are normally calibrated using a special test fixture to provide connection and a separate power supply Calibration can be accomplished on site using an extender card to bring the unit forward out of the rack and using the normal power supply An extender card is available from Moore Industries Page 5 DCA ED Table 2 Calibration Equipment Screwdriver slotted Head width no greater than 2 54 mm 0 1 inch Adjustable dc Must be capable of producing signal ranges signal source defined by input level requirements Dc voltmeter Must be accurate to within 0 05 or better Dc milliammeter Must be accurate to within 0 05 or better Ohmmet
4. Feedback Rectifier Relay Driver Ad Option Relay Driver Ad Option 15 DCA ED Display Output Relay Output Relay RETURN PROCEDURES To return equipment to Moore Industries for repair follow these four steps 1 Call Moore Industries and request a Returned Material Authorization RMA number Warranty Repair If you are unsure if your unit is still under warranty we can use the unit s serial number to verify the warranty status for you over the phone Be sure to include the RMA number on all documentation Non Warranty Repair If your unit is out of warranty be prepared to give us a Purchase Order number when you call In most cases we will be able to quote you the repair costs at that time The repair price you are quoted will be a Not To Exceed price which means that the actual repair costs may be less than the quote Be sure to include the RMA number on all documentation Provide us with the following documentation 8 Anote listing the symptoms that indicate the unit needs repair b Complete shipping information for return of the equipment after repair The and phone number of the person to contact if questions arise at the factory Use sufficient packing material and carefully pack the equipment in a sturdy shipping container 4 Shipthe equipment to the Moore Industries location nearest you The returned equipment will be inspected and
5. THE BUYER FOR PURCHASE OF THE GOODS OR SERVICES ANY CAUSE OF ACTION FOR BREACH OF ANY WARRANTY BY THE COMPANY SHALL BE BARRED UNLESS THE COMPANY RECEIVES FROM THE BUYER A WRITTEN NOTICE OF THE ALLEGED DEFECT OR BREACH WITHIN TEN DAYS FROM THE EARLIEST DATE ON WHICH THE BUYER COULD REASONABLY HAVE DISCOVERED THE ALLEGED DE FECT OR BREACH AND NO ACTION FOR THE BREACH OF ANY WAR RANTY SHALL BE COMMENCED BY THE BUYER ANY LATER THAN TWELVE MONTHS FROM THE EARLIEST DATE ON WHICH THE BUYER COULD REASONABLY HAVE DISCOVERED THE ALLEGED DEFECT OR BREACH RETURN POLICY For a period of thirty six 36 months from the date of shipment and under normal conditions of use and service Moore Industries The Company will at its option replace repair or refund the purchase price for any of its manu factured products found upon return to the Company transportation charges prepaid and otherwise in accordance with the return procedures established by The Company to be defective in material or workmanship This policy extends to the original Buyer only and not to Buyer s customers or the users of Buyer s products unless Buyer is an engineering contractor in which case the policy shall extend to Buyer s immediate customer only This policy shall not apply if the product has been subject to alteration misuse accident ne glect or improper application installation or operation THE COMPANY SHALL IN NO EVENT BE LIABLE FOR ANY INCIDENTAL OR CONSE QUEN
6. made to the terminals on the mating connector of the unit located in the rack Refer to table 3 4 or 5 The terminals are designed for 16 AWG maximum wire size The DCA ED operates directly from a 24 Vdc power source The dc power source should be regulated to within 10 percent of the nominal voltage and should be capable of delivering 5 watts Operation Once the DCA ED has been calibrated and installed it may be left unattended The only controls for the unit are the Setpoint and Dead Band potentiometers which after initial adjustment require no further attention The LEDs on the front of the unit indicate when an alarm is energized Because the circuit uses highly reliable solid state components with no moving parts the DCA ED operates maintenance free for extended periods of time The DCA ED may become warm during operation especially when a large number of cards are mounted together in a rack or cabinet and the ambient tem perature is above normal This is perfectly accept able and should not be cause for alarm unless a malfunction is also observed es 7 50 in 190 5mm 6 30 in i ean KI 14in a i 3 57mm 2 76mm A A 5 06 in 128 4mm 3 50 in 88 9mm 3 94 in 100mm Y Y Y 32 PIN
7. ENTER Support Technical Assistance and Repair our Quick Ship Facility Introduction This manual contains descriptive calibration and maintenance information on the Direct Current Alarm Eurocard style with Display DCA ED The DCA ED accepts all standard process inputs and produces a signal that operates an alarm system The DCA ED may be configured as a single alarm with one relay a dual alarm with two relays operating from one input signal or dual input two isolated channels operating independently from two inputs Each relay has an LED indicator in series which indicates when the relay is energized The unit operates in fail safe mode the relay is energized in the normal condition and is de energized under alarm conditions or power loss Description The DCA ED is a 4 wire alarm unit on a Eurocard The unit features an LCD display in 0 25 inch high black numerals over a reflective background There are 3 1 2 active digits with a decimal point and minus sign to show ranges from 199 9 to 199 9 The display shows the trip point value and input value as a percent of span These values are switch selectable by a rotary switch on the front panel of the unit The main board of the DCA ED is divided into two identical halves channels with separate power supplies A single alarm uses only one channel single input single output A dual alarm uses both channels with the inputs cross linked single input dual output
8. For a dual input unit both channels operate independently without crosslinking This provides two single alarms on one board dual input dual output Two slide switches on the printed circuit board allow each channel to be set to a high or a low alarm both fail safe Trip point controls allow the alarm to be set to trip at any point over the input range Trip point potentiometers are provided to set the point at which each of the alarm relays change state With a high alarm the relay is de energized when the input signal is above the trip point The relay is de energized when the input signal is below the trip point for a low alarm See figure 1 Page 1 DCA ED The dual input DI option unit has two channels A and B Channel A is normally set to the higher trip point but both channels are totally interchangeable A complete set of specifications for the DCA ED is shown in table 1 This specification contains com plete information on input output and performance Model Number Moore Industries model numbers identify the type of instrument functional characteris tics operating parameters any options ordered and housing If all accompanying documentation of a unit is missing the model number can be used to obtain technical information The model number for the DCA ED is located on the plug in connector Serial Number A complete history is kept on every Moore Industries unit This information is keyed to the serial n
9. TIAL DAMAGES WORLDWIDE www miinet com China sales mooreind sh cn Tel 86 21 62491499 FAX 86 21 62490635 United Kingdom sales 9 mooreind com Tel 01293 514488 FAX 01293 536852 o LII MOORE INDUSTRIES 2007 Moore Industries International Inc Belgium info 9 mooreind be Tel 03 448 10 18 FAX 03 440 17 97 The Netherlands sales mooreind nl Tel 0 344 617971 FAX 0 344 615920 Specifications and Information subject to change without notice
10. am in figure 9 Power Supply Circuit Units are supplied for use with a dc power input that is applied directly to the power inverter with diode protection to prevent damage to the power inverter if the dc power input is accidentally connected with reverse polarity Manual Reset The manual reset option configures U2 and U3 such that they latch in an alarm condition An additional input is provided external contact closure to over come the latched condition of U2 and U3 when the input returns to normal Adjustable Dead Band The adjustable dead band circuit adjusts the hyster esis between the trip point and reset points The ad justment is available for both single and dual alarm units The dead band is adjusted by the potentio meter s on the front of the unit After the trip point has occurred the affect of the inverting input pin 9 on amplifier output pin 8 occurs only after the non inverting amplifier input pin 10 is overcome The Dead Band potentiometer varies this non inverting amplifier input level by adjusting the amount of feedback to pin 10 The Dead Band potentiometer varies the difference between the trip point and reset point within the signal span The greater amount of feedback to pin 10 the greater the dead band Maintenance Maintenance of the DCA ED is limited to keeping the terminals clean and tight and ensuring there is adequate ventilation or heat dissipation for the unit It is recommended th
11. and greater than 20 percent may be set using this proce dure Completion of Calibration 1 Remove power from the EU Rack 2 Disconnect the calibration equipment and recon nect the input leads 3 Remove the extender card and the DCA ED 4 Replace the DCA ED in the EU Rack 5 Re connect power to the EU Rack Installation This section contains physical mounting dimensions and electrical connections for the DCA ED Although the units are designed to operate in free air at a high ambient temperature it is recommended that if a large number of units are mounted together in a rack or cabinet attention should be given to adequate ventilation In addition input and output values should be checked on site before the unit is placed into service Mounting The DCA ED is a plug in card that mounts in a rack Moore Industries EU Rack is designed for high density mounting of Moore Industries Eurocards Up to 12 individual cards can be installed in this standard 19 inch rack The EU Rack has 16 point screw connectors or 32 point screw connectors on the terminal block de Page 9 DCA ED pending on the type of Eurocard selected It is available without a terminal block for applications where terminal connectors i e solder tags wire wrap pins etc are used Outline dimensions of the DCA ED and the 19 inch EU Rack are shown in figures 7 and 8 Electrical Connections All electrical connections to the DCA ED are
12. at the user check the terminals every six months Troubleshooting Troubleshooting the DCA ED involves determining whether the unit is functioning abnormally The calibration equipment listed in table 2 can be used to verify that the DCA ED outputs are within specified limits refer to specifications table 1 It is recom mended that any unit found performing below specifi cations be returned to the factory for service in accordance with the instructions on the back cover of this manual If a problem is suspected with the DCA ED it is suggested that the following check list be reviewed as a preliminary step 1 Verify that all electrical connections are clean and tight 2 Verify that the measuring instrument used for input voltage or current is of the proper range and accuracy 3 Verify that the output circuit is electrically isolated from the input circuit If a unit is performing below specifications and the unit cannot immediately be sent back to the factory without affecting operations contact Moore Industries Customer Service Department toll free at 1 800 999 2900 4 In Input Buffer 0 n N Input Buffer o j EN NN Input and Offset Circuit ux ue Upper Lower Figure 9 DCA ED Simplified Block Diagram Power Supply gt Trip Unit A D Converter Latch and Comparator Adjustable Feedback Latch and Comparator Adjustable
13. d 17 Turn the selector switch on the front of the unit to TRIP A 18 Set the TRIP A potentiometer R102 located on the front panel of the unit to the desired trip point value in percent of span 19 For dual alarm and DI units repeat steps 17 and 18 for TRIP B potentiometer R104 Calibrating a Unit with AR Option The Alarm Response Delay AR option introduces a time delay in the unit This makes calibration difficult because the user must wait for the delay time to see if the setpoints have been tripped The delay may be defeated by short circuiting diodes CR4 and or CR16 Take extreme care in shorting diodes as damage may occur if diodes are accidentally shorted to other parts Calibrating a Unit with the DA Option The Deviation Alarm DA option requires two inputs one reference signal and one input signal The deviation alarm detects any variation of the control signal from the reference signal in either direction Page 8 DCA ED Input signal Reference signal REF Alarm 50 Input signal 0 Reference signal 100 Alarm 0 Input signal 100 Reference signal 0 Alarm 100 Calibration is the same as shown using the above conditions for zero percent 50 percent and 100 percent input references Calibrating a Unit with the MR Option If the Manual Reset MR option is present on your unit the dead band circuit is not available Verify that the unit latches upon alarm V
14. e the wiper from one end of its range to the other Page 3 DCA ED The potentiometers are equipped with a slip clutch at each end to prevent damage if the adjustment is turned beyond the wiper stop Usually a slight change can be felt when the clutch is at the end of a range i e slipping However if this change is not felt either end can be reached by turning the shaft twenty turns in the desired direction LEDs LEDs associated with each output relay are included on the front panel of the unit as a standard feature These LEDs inform the user when an alarm condition or power failure has occurred The LEDs are labeled TRIP POINT A and TRIP POINT B on dual input units TRIP POINT A and TRIP POINT B on dual alarm units and TRIP POINT for single alarm units See figure 2 for front panel controls and indicators LCD Display The LCD display has 0 25 inch black numerals over a reflective background There are 3 1 2 digits with a decimal point and minus sign to show ranges from 199 9 to 199 9 The display shows the trip point value and input value as a percentage of span These values are switch selectable See figure 2 for front panel controls and indicators Page 4 DCA ED SX SINGLE INPUT SINGLE ALARM 1 Ore TRIP POINT DX SINGLE INPUT DUAL ALARM lt gt eU Q gt lt OORE INDUSTRIES gt lt Or om Ponte O TRIPA INPUT TRIP B DI DUAL INPUT
15. er Accurate to within 196 Power supply 24 Vdc 91A Female connector DIN 41612 MILLIAMMETER OR VOLTMETER 4 IN NO K1 1 NC K1 1 ADJUSTABLE NO K1 2 DC SIGNAL SOURCE E NC K1 2 TX COM K1 1 goo COM K1 2 MR REF A DA DC DCC POWER INPUT Figure 3 Calibration Setup for Single Input Single Alarm Units Page 6 DCA ED FIG 03 S DA NO 22 NC 2 2 OHMMETER NO x NC K2 1 COMK2 2 MILLIAMMETER COM K 2 1 OR VOLTMETER NO K1 1 ADJUSTABLE NC K1 1 DC SIGNAL SOURCE NOKI 2 NC 1 2 OHMMETER COM Kt 1 MR 15 COM K1 2 REF A DA DC DCC POWER INPUT Figure 4 Calibration Setup for Single Input Dual Alarm Units CHMMETER NC Kee NC REFE DA AOJUSTABLE NOKIA DC SIGNAL SOURCE NC KIA NOKIE NC CHMMETER COKIN COMKIE REF A DA TAB occ POWER Figure 5 Calibration Setup for Dual Input Dual Alarm Units Display Calibration Procedure Calibration consists of simulating an input signal to the DCA ED monitoring the input value on the LCD display of the unit and adjusting the controls to obtain the desired value Trip point settings are also set and verified The DCA ED unit has an LCD display which shows the trip point value and input value as a percent of span NOTE For units configured with the DI option use the corresponding reference d
16. erify the unit resets only by shorting the MR terminals together with an exernal switch after changing the input signal from 25 to 125 Note MR resets both alarms ina dual alarm For DI units MR is separate Calibrating a Unit with the AD Option The Adjustable Dead Band AD option provides an adjustable 1 20 percent dead band from the trip point available to 100 percent When the controlled UP HIGH ALARM DOWN LOW ALARM variable is within this range no control action takes place The following is an example of a 20 percent dead band adjustment procedure 1 Turn Dead Band A potentiometer R103 fully clockwise 2 Apply power to the unit 3 Adjust TRIP TRIP A potentiometer to exactly 60 percent as indicated by the LCD when set to TRIP A 4 Set SW1 alarm status to low Check that the unit trips at 60 percent and untrips at 80 percent or greater 5 Turn the Dead Band potentiometer counterclock wise so the unit now untrips at 80 percent 0 1 percent 6 Set SW1 alarm status to high Check that the unit trips at 60 percent and untrips at 40 percent 2 percent 7 For dual alarm or DI units repeat steps 1 through 6 for TRIP B potentiometer and Dead Band B potentiometer R105 using SW2 Figure 6 Switch Positions Any amount of dead band between 0 5 percent
17. esig nation for DI and repeat the test for the B channel 1 Disconnect power from the EU Rack 2 Remove the DCA ED to be calibrated from the EU Rack 3 Insert the extender card into the Eurorack 4 Insert the DCA ED into the extender card 5 Verify that switches SW1 and SW2 dual alarm are set for a high or low alarm as specified See figure 6 UP high alarm DOWN low alarm 6 Connect a precision signal source to the input of the DCA ED Connect a 24 Vdc power source Refer to figures 3 4 and 5 7 Turn the selector switch to the INPUT position DI IN B 8 Apply power to the unit and set the signal source to an input equal to zero percent of the input range 9 The display should read 000 0 percent 10 If the display does not read 000 0 percent adjust the display Zero potentiometer R109 for 000 0 percent DI R112 11 Adjust the signal source to 100 percent of the input range Page 7 DCA ED 12 If the display does not read 100 0 percent adjust the display Span potentiometer R6 for 100 0 percent 13 For dual alarm units set the input selector switch to the blank position between input and TRIP B Adjust R51 for 100 0 percent on the display DI R51 14 Repeat steps 8 9 and 10 to verify a zero percent input reading 15 Apply 0 25 50 and 75 percent input 16 Observe the LCD display at each setting in step 15 and verify that the input is linear for the operating range selecte
18. tested at the factory A Moore Industries representative will contact the person designated on your documentation if more information is needed The repaired equipment or its replacement will be returned to you in accordance with the shipping instructions furnished in your documentation WARRANTY DISCLAIMER THE COMPANY MAKES NO EXPRESS IMPLIED OR STATUTORY WARRAN TIES INCLUDING ANY WARRANTY OF MERCHANTABILITY OR OF FITNESS FOR A PARTICULAR PURPOSE WITH RESPECT TO ANY GOODS OR SER VICES SOLD BY THE COMPANY THE COMPANY DISCLAIMS ALL WARRAN TIES ARISING FROM ANY COURSE OF DEALING OR TRADE USAGE AND ANY BUYER OF GOODS OR SERVICES FROM THE COMPANY ACKNOWL EDGES THAT THERE ARE NO WARRANTIES IMPLIED BY CUSTOM OR USAGE IN THE TRADE OF THE BUYER AND OF THE COMPANY AND THAT ANY PRIOR DEALINGS OF THE BUYER WITH THE COMPANY DO NOT IM PLY THAT THE COMPANY WARRANTS THE GOODS OR SERVICES IN ANY WAY ANY BUYER OF GOODS OR SERVICES FROM THE COMPANY AGREES WITH THE COMPANY THAT THE SOLE AND EXCLUSIVE REMEDIES FOR BREACH OF ANY WARRANTY CONCERNING THE GOODS OR SERVICES SHALL BE FOR THE COMPANY AT ITS OPTION TO REPAIR OR REPLACE THE GOODS OR SERVICES OR REFUND THE PURCHASE PRICE THE COMPANY SHALL IN NO EVENT BE LIABLE FOR ANY CONSEQUENTIAL OR INCIDENTAL DAMAGES EVEN IF THE COMPANY FAILS IN ANY ATTEMPT TO REMEDY DEFECTS IN THE GOODS OR SERVICES BUT IN SUCH CASE THE BUYER SHALL BE ENTITLED TO NO MORE THAN A REFUND OF ALL MONIES PAID TO THE COMPANY BY
19. tion Switch Enables User to display input or trip point value Operating Temperature Range 18 to 65 C 0 to 150 F Effect Less than 0 018 C 0 01 F over above range Feature Relay status LEDs light when relays are energized switch selectable for high low status Display Shows trip point value and input value as a percentage of span switch selectable Type LCD 0 25 inch high black numerals over reflective background Format 3 1 2 digits Range 199 9 to 199 9 Decimal point One Rate Two readings per second Resolution 0 1 1 LSD Calibration This section provides information necessary to adjust and calibrate the unit Each unit is adjusted and checked at the factory for proper performance before shipping After the DCA ED unit is unpacked general operation level checks of the individual unit are recommended Generally these checks which are specified in the Calibration Procedures Section require little or no adjustments Adjustments The DCA ED has trip point and dead band adjust ments located on the front panel of the unit They are represented symbolically on the front panel by the following markings lt gt represents Trip Point gt lt represents Dead Band Each of these adjustments has a multiturn potenti ometer that is adjustable using a slotted screwdriver The type of potentiometer used with these adjust ments usually require 20 turns of the shaft to mov
20. umber Whenever service data is required on a unit it is necessary to provide the factory with the serial number This information is engraved on the printed circuit board of the unit HIGH ALARM 10076 ALARM STATE Analog Value 7 VN RESET lt _0 _ SAFE STATE RELAY ENERGIZED LED ON RELAY DE ENERGIZED LED OFF LOW ALARM 10020 100 SAFE STATE Na a aaan RESET v Analog DEAD BAND lt 7 TRIP POINT 0 ALARM STATE Figure 1 High and Low Alarm Configurations Page 2 DCA ED Characteristic Table 1 DCA ED Specifications Specification Current 1 5 mA 200 ohm nominal input impedance 4 20 mA 50 ohm nominal input impedance 10 50 mA 20 ohm nominal input impedance 0 20 mA 50 ohm nominal input impedance Voltage Input impedance 1 My minimum 200 Ky with DA or ATL option 0 5 V 1 5 V 0 25 1 25 V 0 1 V 1 or 2 DPDT relay contacts rated 5 A 117 Vac non inductive or 28 Vdc TXA Output 25 mA 24 Vdc 5 TXB Output 25 mA 24 Vdc 5 Input Power 24 Vdc 10 5 watts nominal Performance Repeatability Trip point repeats within 0 1 of full span Dead band 1 of span standard Response 150 milliseconds for a step change of 1 of span beyond trip points Line Voltage Effect 0 005 1 line change Controls Set Point Multiturn potentiometer adjustable over 0 100 of span Dead Band Externally adjustable dead band 1 20 of span nominal Selec
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