- 1 - User`s Manual: Series 450T Model 450T Freq
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1. NEMA Type 1 enclosure Printed Circuit Board Coating Fungus resistant acrylic conformal coat Mounting Position Position insensitive MOUNTING DIN General Purpose Housing DIN Rail Mount amp T rails G Rail 32mm Type EN50035 T Rail 35mm Type EN50022 Refer to Drawing 4501 348 for outline and clearance dimensions Shipping Weight 1 pound 0 45 Kg packed Series 450T User s Manual Frequency Input CERTIFICATION Consult the factory for current information on the availability of agency e g Canadian Standards Association Factory Mutual etc approvals NCR No Certification Required INSTALLATION The transmitter is packaged in a general purpose enclosure Use an auxiliary enclosure to protect against unfavorable environments and locations Maximum operating ambient temperatures should be within 139F to 1859F 259C to 859C for satisfactory performance Factory calibrated units are ready for installation Connect as shown in the connection diagram of Drawing 4501 356 If the unit is not factory calibrated refer to the CALIBRATION section Mounting Mount transmitter assembly refer to Drawing 4501 348 for mounting and clearance dimensions DIN Rail Mounting Using suitable fastening hardware secure the DIN rail to the designated mounting surface A transmitter can be mounted to either the T or G Rail Installation of the transmitter to the rail depends on the type of DIN rail used Units can2. Transmitter Shunt Block Configuration Procedure The frequency transmitter is quite universal in that it can be configured for Unipolar or Bipolar input signals a large number of frequency ranges and ripple response filtering Before the adjustment procedure can proceed the jumpers have to be configured to the requirements of the application refer to Drawing 4501 357 for details To gain access to the Configuration Jumpers first remove the transmitter from the installation Second remove the circuit boards from the plastic enclosure as described in the Jumper Configuration procedure below Third configure the jumpers shunt blocks as described in the Jumper Configuration procedure below refer to Drawing 4501 357 NOTE Calibration per the Adjustment Procedure should be performed before the circuit boards are reassembled within the plastic enclosure Disassembly Procedure for the 450T Plastic Housing The plastic housing has no screws it snaps together A flat head screwdriver Acromag 5021 216 or equivalent is needed to pry the housing apart as described in the following steps CAUTION Do not push the screwdriver blade into the housing more than approximately 0 1 inches while prying it apart Handling of the printed circuit board should only be done at a static free workstation otherwise damage to the electronics could result 1 To begin disassembly refer to Drawing 4501 357 place the screw driver at point A left side
3. W 1 5V DC THRESHOLD FREQUENCY RANGE 79 RESPONSE TIME INPUT CONDITIONING IR M BIPOLAR ZERO CROSSING oom QV DC THRESHOLD JUMPER CONFIGURATION SEE NOTE 1 Example Configuration Filter 3 4 Second Response Bipolar input ud A to 09 WIXOM WICH 23 SEP 93 A 1 Ke BC BC NOTE 1 REFER TO THE CALIBRATION SECTION OF THE n MANUAL FOR DETAILED INSTRUCTIONS 50 FREQUENCY JUMPER CONFIGURATION 2 aser or 4501 357 NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS WIRE INSERTION CLAMPS 12 PLACES E G RAIL DIN MOUNTING T RAIL DIN MOUNTING SHOWN THIS SIDE 9 SHOWN THIS SIDE N DIN EN 50035 32mm DIN EN 50022 35mm G RAIL DIN MOUNTING SHOWN H DIN EN 50035 32mm RAIL DIN MOUNTING SHOWN HERE DIN EN 50022 35mm o SCREWDRIVER SLOT FOR REMOVAL FROM T RAIL NOTE ADJACENT UNITS CAN BE MOUNTED ON 1 6 INCH 40mm CENTERS ENCLOSURE DIMENSIONS FOR DIN RAIL MOUNTINC Acromag wikom MICH j ex of SSERIES 4507 HOUSING DIN RAIL MOUNT fo asor 151 84501 348 NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS
4. be mounted side by side on 1 6 inch centers if required T Rail 35mm Type EN50022 To attach a transmitter to this style of DIN rail angle the top of the unit towards the rail and locate the top groove of the adapter over the upper lip of the rail Firmly push the unit towards the rail until it snaps solidly into place To remove a transmitter insert a screwdriver into the lower arm of the connector and pull downward while applying outward pressure to the bottom of the unit Rail 32mm Type EN50035 To attach a transmitter to this style of DIN rail angle the unit so that the upper groove of the adapter hooks under the top lip of the rail Firmly push the unit towards the rail until it snaps solidly into place To remove a transmitter pull the lower part of the unit outward until it releases from the rail and lift the unit from the rail Electrical Connections Regardless of the mounting configuration employed the electrical connections are basically identical The wire size used to connect the unit to the control system is not critical AII terminal strips can accommodate wire from 14 26 AWG Strip back the insulation 1 4 inch on each lead before installing it into the terminal block Input wiring may be either a shielded or unshielded twisted pair Output wires should be twisted pair Since common mode voltages can exist on signal wiring adequate wire insulation should be used and proper wiring practices followed It is recommend
5. clockwise until the output is reduced to the desired value NOTE If the minimum input is 0 Hz it can be simulated by temporarily disconnecting the signal generator and shorting the input terminals of the transmitter Before going to Step 3 remove the short circuit and connect the signal generator to the input terminals 3 Setthe input frequency to 12 800 Hz Adjust the Span S pot until the output reads 20 000mA 4 Repeat Steps 2 and 3 above until the readings converge The instrument is now calibrated Several mid point values should also be checked to verify proper operation of the transmitter 5 After the above calibration procedure is complete install the transmitter PC Board assembly back into its case as described in the assembly procedure below za Series 450T User s Manual Frequency Input Assembly Procedure for the 450T Plastic Housing NOTE The Model Serial Number is attached to the left plastic side 1 Refer to drawing 4501 357 and line up the left plastic side with the board and terminal assembly Carefully but firmly press the pieces together 2 Align the pins of the center section with the side and press the pieces together 3 Now line up the right side of the housing with the left side and center assembly and carefully but firmly press the pieces together GENERAL MAINTENANCE The transmitter contains solid state components and requires no maintenance except for periodic cleaning and calibration verif
6. 0K ohms typical Input span and zero ranges are adjustable as specified below except for special ranges which are factory calibrated per customer specifications Series 450T User s Manual Frequency Input FQ1 Frequency Span 25Hz to 25 600Hz Zero 0 to 2096 of Span The input span is continuously adjustable over the preselected input range The minimum input frequency for any range can be from 0 to 20 of the full scale frequency FQ Range A Span 25 50Hz FQ Range B Span 50 0 100 Hz FQ Range C Span 100to 200 Hz FQ Range D Span 200to 400 Hz FQ Range E Span 400 800 Hz FQ Range Span 800 to 1 600 Hz FQ Range G Span 1 600 to 3 200 Hz FQ Range Span 3 200 to 6 400 Hz FQ Range I Span 6 400 to 12 800 Hz FQ Range J Span 12 800 to 25 600 Hz Isolation Three way isolation is provided between input output and power for common mode voltages up to 250V AC or 354V DC off ground on a continuous basis will withstand 1500V AC dielectric strength test for one minute without breakdown This complies with test requirements outlined in ANSI ISA S82 01 1988 for the voltage rating specified Input Circuit Open Response Down scale drive standard Bipolar Input Configuration User configured by internal jumpers shunt blocks Threshold 0 0V DC Input Amplitude 25mV to 150V RMS Hysteresis 25 fixed nominal The switching points are 25mV and 25mV nominal or 0 0V 0 025V Unipolar Input C
7. A and 200mV corresponds to 20mA of loop current For voltage outputs Vx units the Output S terminal 1s electrically equivalent to the Output terminal Output Limiting Voltage units Vx 120 of full scale output nominal Current unit Y 125 of full scale output 24mA nominal Output Ripple Less than 0 1 of the maximum output span POWER 1 115V AC 4 1096 50 to 60Hz 0 05A Y units 0 020A Vx units 2 230V AC 10 50 to 60Hz 0 025 Y units 0 010A Vx units Power Supply Effect Less than 0 01 of output span for rated supply variations Reference Test Conditions Input 0 12800Hz 100 ohm resistive source Output Y units 4 20mA DC 500 Ohm load Output Vx units 0 10V DC into 10K ohms or greater Ambient TTOF 250C 115 AC supply Accuracy Better than 0 1 of calibrated span The error includes the combined effects of transmitter repeatability hysteresis terminal point linearity and adjustment resolution Does not include sensor error Ambient Temperature Range 139F to 1859F 259C to 859C Ambient Temperature Effect Combined effects of zero span over temperature Less than 0 01 of output span per 0 018 per C over ambient temperature range for reference test conditions Bandwidth 3dB at 25600 Hz typical Series 450T User s Manual Frequency Input Response Time Shunt block selection of the filter networks on the PC Board will result in d
8. Acromag 9 User s Manual Series 450T Model 450T Frequency Input AC Powered Transmitters Table of Contents Page InttOd ctl Oh ai Arr rav ara eee bee a A ne aie een edet da 2 lb gea Ec 2 PPC CLIC btt past Uh UR RN atus pidas tie idque da es 3 Installation cete nM cc cu D ALS UU UO DA MEM A 6 Calibration 8 General Maintenances i c ce ee Hs A ak ea 12 List of Drawings Electrical Connections Frequency Input No 4501 356 see 13 Configuration Jumper Location Frequency Input No 4501 357 14 Dimensions DIN Rail Mounting No 4501 348 sse 15 It is very important for the user to consider the possible adverse effects of power wiring component sensor or software failures in designing any type of control or monitoring system This is especially important where economic property loss or human life is involved It is important that the user employ satisfactory overall system design It is agreed between the Buyer and Acromag that this is the Buyer s responsibility Acromag Inc Tel 248 624 1541 30765 Wixom Road P O Box 437 FAX 248 624 9234 Wixom Michigan 48393 7037 USA Copyright 1993 Acromag Inc Printed in USA Data and specifications subject to change without notice Series 450T User s Manual Frequency Input INSTRUCTIONS SERIES 450T Frequency Input AC Powered Transmitters INTR
9. ODUCTION These instructions cover the model types listed in Table 1 below Supplementary sheets are attached for units with special options or features Table 1 A Model Number Format 450T Input Output Power Mtg Certif Calibration B Typical Model Number 450T FQ1 Y 1 DIN NCR C 450T FQI 1 DIN _ 2 Approval VO V5 Notes Table 1 The 1 can be ordered with or without the factory calibration C option other input types automatically include calibration to the customer s specification no C needed Any customer specified calibration information will be included on a separate calibration label on the unit Consult the factory for current information on agency e g Canadian Standards Association etc approvals DESCRIPTION The Series 450T is an AC powered three way isolated DIN rail mounted transmitter family This model accepts a periodic or pulse waveform signal such as those originating from tachometers magnetic transducers and turbine flow meters and converts this signal to a process current or voltage output directly proportional to the signal frequency Other 450T transmitters are available to condition voltage current thermocouple and RTD inputs In addition to three way isolation this model also provides wide range zero and span adjustments Series 450T transmitters are available for 115V or 230V AC power for DC power applications see the Acromag Series 350T transmitter fam
10. Y A PRECISION D 10 OHM RESISTOR IS PLACED IN SERIES WITH THE OUTPUT TERMINAL 17 25ppm A DVM MAY BE CONNECTED BETWEEN THE OUTPUT S AND TERMINAL TO MONITOR THE LOOP CURRENT THUS A DVM MEASUREMENT OF 48mV IS EQUIVALENT 4mA AND 200mV IS EQUIVALENT TO 20mA OF LOOP CURRENT FOR VOLTAGE OUTPUT UNITS Vx THE OUTPUT S TERMINAL IS ELECTRICALLY EQUIVALENT TO THE OUTPUT TERMINAL L v4 Acro ag ROUND UND UNIPOLAR UNIPOLAR UNIPOLAR CONTACT CLOSURE of 1 45 1 356 q N Q 021000 mma INPUT _ 2 209659 BOARD INTERCONNECTION BOARDS FOR ITTT ACCESS TO THE RANGE d CAREFULLY SEPARATE LU IU JI THE TWO SELECTION JUMPER J2 RANGE SELECTION JUMPER J2 RANGE A RANGE B RANGE C RANGE D RANGE E RANGE RANGE RANGE H 25 TO 50 Hz 50 TO 100 Hz 100 TO 200 Hz 200 TO 400 Hz 400 TO 800 Hz 800 TO 1600 Hz 1600 TO 3200 Hz 3200 TO 6400 Hz Exomple Configuration Range 0 TO 12 800 Hz FREQUENCY RANGE RESPONSE TIME SELECTION TO 98x 135 FILTER 1 8 0 SECOND RESPONSE FREQUENCY RANGES A THROUGH J PIN 1 TO 3 AND PIN 2 TO 4 FILTER 2 5 0 SECOND RESPONSE FREQUENCY RANGES C THROUGH J PIN 1 TO 3 AND PIN 4 TO 6 FILTER 3 0 4 SECOND RESPONSE FREQUENCY RANGES D THROUGH J PIN 3 TO 5 AND PIN 4 TO 6 INPUT CONDITIONING UNIPOLAR
11. ed that output power wiring be separated from signal wiring for safety as well as for low noise pickup Series 450T User s Manual Frequency Input l Power Refer to Drawing 4501 356 for power connections The label on the unit specifies the AC power requirements Connect AC power as shown in the connection diagram Drawing 4501 356 Use suitable wire per applicable codes For 115V AC units connect the AC HOT power lead to the L1 terminal and the AC NEUTRAL power lead to the terminal marked W For 230V AC units connect the AC L1 power lead to the L1 terminal and AC L2 power lead to the terminal marked L2 Connect the AC GROUND lead to the G terminal The AC Ground G terminal is not connected internally Grounding The transmitter housing is plastic and does not require an earth ground connection If the alarm is mounted in a metal housing a ground wire connection is required Connect the ground terminal of the metal housing Green Screw to a suitable earth ground using appropriate wire per applicable codes Output Connect output per connection diagram refer to Drawing 4501 356 Load range is a function of the module s output type refer to Output in the preceding SPECIFICATIONS section The output is isolated from the input and power circuits Input Connect input per connection diagram refer to Drawing 4501 356 Be sure to observe proper polarity on unipolar inputs see label for input type If unit is factory cal
12. es 350T DC powered transmitters providing the same input conditioning for AC powered applications The modular approach of this design and companion Acromag flat pack modules allows additional transmitters input modules isolators and alarms to be easily integrated as required The 450T transmitter is EMI and RFI protected operates over a wide temperature range and features excellent temperature coefficients which minimize the effects from harsh plant environments In addition the safe compact rugged and reliable design of this transmitter allow it to be used in control room or field locations Input wiring is inserted in the bottom of the unit while output and power wiring is inserted at the top of the unit Screws to secure the wiring are located on the front panel Connectors are screw clamp type and accept wire size up to 14 AWG SPECIFICATIONS Function This AC powered transmitter accepts a frequency periodic or pulse waveform input signal and converts the input signal to a process current or voltage output The unit provides three way isolation between the input output and power circuits Wide range zero and span adjustments utilize 22 turn potentiometers accessible on front of the unit Optional 115V AC or 230V AC power may be selected The transmitter is DIN rail mounted MODEL SERIES 450T Color coded with a white label INPUT Frequency direct coupled input for span ranges from 25Hz to 25600Hz input impedance is 5
13. ibrated the calibration label indicates range of input Note The input circuit is electrically isolated from the output and power circuits allowing the input to operate up to 250V AC or 354V DC off ground on a continuous basis If your input is from a contact closure or from an open collector transistor the excitation circuit must be activated by placing a short jumper wire between the input and L terminal of the transmitter The input circuit of the transmitter accepts most periodic waveforms and will trigger on the positive edge of the input waveform The input stage of the transmitter has a built in low pass filter R1 C1 to remove any high frequency noise that may be present on the input signal If a digital 5V pulse is used to drive the input stage the width of the pulse should be greater than 10 microseconds NOTE If the input signal amplitude is not adequate to meet the threshold hysteresis requirements the output will go to a value that represents O Hertz Series 450T User s Manual Frequency Input CALIBRATION A TRANSMITTER This section provides information for unit configuration and calibration If the unit was factory calibrated jumpers have been placed in their proper positions and verification of the calibration can be made per the Adjustment Procedure If the calibration of the unit is to be changed first go to the Shunt Block Configuration Procedure before going to the Transmitter Adjustment Procedure 1
14. ication When a failure is suspected a convenient method for identifying a faulty transmitter is to exchange it with a known good unit It is highly recommended that a non functioning transmitter be returned to Acromag for repair since Acromag makes use of tested and burned in parts and in some cases parts that have been selected for characteristics beyond that specified by the manufacturer Further Acromag has automated test equipment that thoroughly checks the performance of each transmitter dade VOLTAGE V V5 AC INPUT POWER OR CURRENT Y OUTPUT AC AC w Ac Lo AC LO 2 SEE NOTE 1 ZERO SPAN s escono c T SPAN NOTE INPUT GROUND TERMINAL IS NOT CONNECTED INTERNALLY Qo OUTPUT S NOTE 1 SEE NOTE 1 SIGNAL OUTPUT AMPLIFIER AMPLIFIER SIGNAL ISOLATION OPTIONAL TRANSMITTER ZERO AND SPAN ADJUSTMENTS GROUND AC POWER FOR INTERNAL TRANSMITTER ISOLATION CONFIGURATION JUMPERS wc AWING 4501 357 INPUT OUTPUT SEE DRAWING 4501 3 POWER POWER 115VAC 230VAC NC SUPPLY SUPPLY w wc ISOLATION Nc Z 6 SERIES 45 T SIMPLIFIED SCHEMATIC FREQUENCY GENERATOR INPUT SEE BELOW SERIES 450T FREQUENCY FREQUENCY TRANSMITTER INPUT CONNECTIONS EXCITATION IS ACTIVATED BY AN TRANSMITTER ELECTRICAL CONN ECTIONS EXTERNAL JUMPER BETWEEN OPEN COLLECTOR INPUT AND L TERMINALS FREQUENCY SOURCE TRANSISTOR NOTE 1 FOR PROCESS CURRENT OUTPUT UNITS
15. ifferent response times Standard unit is shipped configured for a 0 4 second response filter To maintain low output ripple for each frequency range use the recommended filter For a step change in the input frequency the nominal response time for a 9896 change of the output span is specified below Install shunt blocks per Table below refer to Drawing 4501 357 Table Frequency Range Response Time Selection Response Frequency Span Filter Jumpers Time 98 Range Jumper Block J1 shunt A thru J Pins 1 amp 3 Pins2 amp 4 C thru J Pins 3 amp 5 Pins 2 amp 4 D thru J Pins 3 amp 5 Pins 4 amp 6 Noise Rejection Common Mode 115dB 60 Hz 100 ohm unbalance typical Normal Mode Not applicable RFI Resistance Less than 0 5 of output span with RFI field strengths of up to 10V meter at frequencies of 27 151 and 467 MHz EMI Resistance Less than 0 25 of output span effect with switching solenoids or commutator motors Surge Withstand Capability SWC Input Output terminations are rated per ANSI IEEE C37 90 1978 Unit is tested to a standardized test waveform that is representative of surges high frequency transient electrical interference observed in actual installations Construction Printed Circuit Boards Military grade FR 4 epoxy glass circuit board Terminals Compression type wire size 14 AWG maximum Case Self extinguishing NYLON Type 6 6 polyamide thermoplastic UL94 V 2 color black General Purpose
16. ily The versatile DIN rail mount can accommodate a variety of mounting applications See Drawing 4501 356 for a simplified schematic Series 450T User s Manual Frequency Input The input circuit is direct coupled and can accept signal amplitudes from 25mV to 150V RMS Any one of ten input frequency ranges from 25Hz to 25600Hz spans can be selected by changing one jumper shunt block on a digital divider network Additional features of this unit include the following A quartz crystal time base design is used for improved temperature performance Three field selectable filter network time constants are provided to optimize the output response time and ripple characteristics Two field selectable input threshold circuits are provided one for bipolar zero crossing signals and one for unipolar non zero crossing signals In the bipolar mode the transmitter has a zero volt threshold and fixed hysteresis If configured in the unipolar mode the module has a 1 5 volt threshold and fixed hysteresis In addition the unipolar mode provides an excitation or pull up circuit This excitation allows interfacing to passive frequency inputs such as with dry rated contact closures and open collector transistor switches The Series 450T is another member of the Acromag flat pack DIN rail mounted instrument family It provides another functional component for a modular solution to varied field applications The Series 450T complements the Acromag Seri
17. ncy range for the input signal and place the shunt block in the required range position A through J Refer to Drawing 4501 357 for proper jumper shunt block position NOTE for best results select the smallest frequency range that will cover the frequency span being monitored 3 OUTPUT RIPPLE RESPONSE TIME Select the filter for desired results Refer to table 1 on Drawing 4501 357 for proper jumper shunt position Refer to Response Time in the preceding SPECIFICATIONS section which describes the frequency response time combinations that can be achieved while maintaining less than 0 1 output ripple from 10 to 100 of full scale Faster response times may be used when output ripple is not critical Units which have not been factory calibrated have a response time of 0 4 seconds 4 IMPORTANT Mark the transmitter s configuration on the calibration label located on the enclosure For example IN Bipolar Range I 0 to 12 800Hz Filter 3 0 4 seconds Jumper Configuration Example The following is the configuration for the example given below make adjustments to the configuration as required for your application For our example configure the internal jumpers as follows A Unipolar Bipolar Bipolar Shunt Block 11 pins 9 amp 10 B Frequency Range Range I 0 to 12800Hz Shunt Block J2 position I C Ripple Response 0 4 Seconds Shunt Block J1 pins 3 to 5 amp 4 to 6 pes Series 450T User s Manual Frequency Inpu
18. of the alarm While pressing the blade into the seam use a twisting motion to separate the sides slightly Repeat this operation at point B 2 Now that the two pieces have been partially separated use the screw driver blade to work the left side of the package loose by working around the alarm and carefully prying the sides further apart Repeat this action until it is easy to remove the left side from the plastic pins holding the pieces together 3 Repeat this operation for the right side starting at points C and D 10 Series 450T User s Manual Frequency Input CAUTION If the two PC boards become separated while taking the package apart re align the boards making sure that both interconnection headers are aligned with their mating sockets and carefully push the boards back together Jumper Configuration Shunt Blocks Shunt blocks are provided to accommodate in field configuration changes In case of misplacement additional shunt blocks may be ordered from the factory When ordering additional shunt blocks refer to Acromag Part Number 1004 332 1 CONDITIONING SELECTION Determine whether the input signal is a zero crossing or a non zero crossing signal The sinusoidal output from a passive magnetic pickup is a typical zero crossing signal A typical TTL output is a non zero crossing signal type Refer to Drawing 4501 357 for proper jumper shunt position 2 INPUT FREQUENCY RANGE Select the desired freque
19. onfiguration User configured by internal shunt jumper Threshold 1 5V DC Attenuator resistors may be installed on the PC board to further reduce sensitivity by raising the threshold level consult the factory Hysteresis 25mV fixed nominal The switching points are 1 525V and 1 475V nominal or 1 5V 0 025V Input Amplitude 0 to 2V to 150V RMS Unipolar Excitation Supply In the unipolar mode the L terminal provides an excitation supply for contact closure or open collector transistor switching circuits Nominal excitation pull up is 5V DC through 15K ohms 0 333mA nominal NOTE If input leads are long capacitance developed across the input leads could limit use to lower frequencies Minimum Pulse Width The minimum pulse width required is 10uS Series 450T User s Manual Frequency Input OUTPUT Process Current or Voltage output Voltage outputs are designed to provide true voltage output with zero volts included and to be stable with capacitive loads Y 4 to 20mA DC R Load 0 to 600 ohms V0 0 to 10V DC into 10 000 ohms or greater V5 0 to 5V DC into 5 000 ohms or greater NOTE For process current output Y units the loop current may be monitored by placing a DVM between the Output S and Output terminal This connection measures the current drop through a precision 10 ohm resistor placed in series with the Output terminal 0 1 25ppm A DVM measurement of 40mV corresponds to 4m
20. t Transmitter Adjustment Procedure Connect transmitter as shown in the connection diagram refer to Drawing 4501 356 The input signal source must be adjustable over the entire frequency range 0 25600 Hz of the transmitter In addition the frequency source must be adjustable and stable to any specific frequency with an accuracy of 0 196 or better Signal amplitude should be set at a level representative of the actual input signal It is recommended that a frequency counter be used to measure input frequency as most dial markings are not accurate enough The output voltage must be measured to 0 1 accuracy or better for proper results The Zero and Span adjustments are accessible at the front panel of the transmitter see Drawing 4501 356 for their location The screwdriver blade used to adjust the potentiometers should not be more than 0 1 inch 2 54mm wide Transmitter Calibration Example Model 450T FQ1 Y 1 DIN NCR Input 0 12800Hz Bipolar input Filter 0 4 second step response Output 4 20mA DC Power 115V AC 1 The calibration signal amplitude requirements are a function of the Input Conditioning Type selected A Unipolar Threshold 1 5V DC Nominal use a 0 2 0V signal or greater B Bipolar Threshold 0 0V DC Nominal use a 0 2V signal or greater 2 Setthe input frequency to 0 Hz Adjust the Zero Z pot until the output reads 4 000mA If the output cannot be reduced to 4 000mA turn the Span pot counter
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