Electrical Connections; Conduit; Field Wiring - Emerson Fisher 4200 Instruction Manual

4200 Transmitters
March 2011
14. Perform the electrical connections.

Electrical Connections

WARNING
Select wiring and/or cable glands that are rated for the environment of use (such as hazardous area, ingress protection and
temperature). Failure to use properly rated wiring and/or cable glands can result in personal injury or property damage
from fire or explosion.
Wiring connections must be in accordance with local, regional, and national codes for any given hazardous area approval.
Failure to follow the local, regional, and national codes could result in personal injury or property damage from fire or
explosion.
Note
For North American intrinsically safe installations, refer to the loop schematics shown in figures 24 and 25 or to instructions
supplied by the barrier manufacturer for proper wiring and installation. For all other applications install the product per local,
regional, or national code, rules, and regulations.

Conduit

Install conduit using local and national electrical codes which apply to the application.

Field Wiring

Figure 4 shows typical field wiring connections into the field wiring compartment. The transmitter is powered by 24
volts DC. Refer to table 1 to 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 milliamperes 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.
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Instruction Manual
D200354X012