Emerson Fisher 4200 Series Instruction Manual page 10

4200 Series Transmitters
determine the power supply requirements. For units
without position switches, the 24 volts dc can be
provided by the receiving device or an external
supply.
For units with position switches, the power supply
provides 24 volt dc power to the position switch
circuit in units without the transmitter, or to both the
position switch circuits and transmitter in units with
the transmitter. A 24 volt dc power supply
independent of the receiving device is
recommended. A separate return is required for the
relays. This prevents relay return currents from
flowing in the transmitter 4 to 20 ma dc current loop.
For the position switch relay wiring, during normal
operating conditions relays K1 and K2 are
energized, which connects the common (C) terminal
to the normally open (NO) terminal (TB1 and TB2,
figure 4). During a tripped (or alarm) condition the
relay is de-energized, which connects the C terminal
to the normally closed (NC) terminal. If power is
removed or lost from the power supply both relays
are de-energized which connects the common (C)
terminals to the normally closed terminals (NC).
CAUTION
Connect the transmitter grounding
terminal (key 58) to an earth ground.
Improper grounding of the position
transmitter can cause erratic
operation.
Before making transmitter or position switch
connections, ensure that the power supply is turned
off. Refer to figure 4 for location of connections.
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:
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 Type 4210, 4215, or 4220 transmitter
with position switches, connect a wire from the
10
Note
(−) 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 Type 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 Type 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 Type 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.
Instruction Manual
Form 5596
July 2005