Potentiometer Alignment - Emerson Fisher 4200 Instruction Manual

4200 Transmitters
March 2011
1. Remove the cover from the field wiring compartment.
2. Bring the transmitter field wiring and/or position switch wiring into the housing through one or both of the ports.
3. Field wiring connections:
Note
On transmitters with position switches, always make the connection between the power supply negative (-) terminal and the (R)
terminal on TB3, even if the position switch outputs are not used.
a . For a 4210, 4215, or 4220 transmitter with position switches, connect a wire from the (-) terminal of the power
supply to the (R) terminal on TB3. Also connect a wire from the (-) terminal on the power supply to the negative
(-) terminal of the receiving device. Connect a wire from the receiving device positive (+) terminal to the (-)
terminal on TB3. Connect a wire from the (+) terminal on the power supply to the (+) terminal on TB3. Provide
wiring for the position switch indicating device to match the application.
b . For 4212 and 4222 position switches without a transmitter, connect a wire from the (+) terminal of the power
supply to the (+) terminal on TB3. Connect a wire from the (-) terminal of the power supply to the (R) terminal on
TB3. Provide wiring for the position switch indicating device to match the application.
c . For a 4211 or 4221 transmitter without position switches. Connect a wire from the (+) terminal of the power
supply to the (+) terminal on the barrier strip (key 11). Connect a wire from the (-) terminal of the power supply
to the negative (-) terminal of the receiving device. Connect a wire from the receiving device positive (+) terminal
to the (-) terminal on the barrier strip.
4. Connect the grounding terminal (key 58) to an earth ground.
5. For a 4210, 4212, 4215, 4220, or 4222 instrument with position switches, perform the following steps to connect
the position switch wiring:
a . Connect the high position switch field wiring from the high indicating device to TB1 on the field circuit printed
wiring board.
b . Connect the low position switch field wiring from the low indicating device to TB2 on the field circuit printed
wiring board.
6. If only one output port is used, screw the pipe plug (supplied with the transmitter) into the unused port.
7. Perform the potentiometer alignment and direct/reverse action procedures for all applications.

Potentiometer Alignment

CAUTION
The following procedure must be performed prior to calibrating the transmitter or position switches. Failure to perform
this procedure may result in erratic performance or unit failure.
This procedure adjusts the potentiometer to the center of its electrical travel when the control valve actuator or other
device is at the center of its mechanical travel.
Refer to the Calibration section for the test equipment required in this section.
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Instruction Manual
D200354X012