Figure 3 - transmitter wiring, Use of snubbers with inductive loads – Dwyer MPCJR User Manual
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Connect Jumper between terminals 3 and 12
Connect Transmitter Plus (+) to terminal 11
Connect Transmitter
Minus (-) to terminal 5
Level
Transmitter
Figure 3 - Transmitter Wiring
For three or four wire transmitters follow the wiring instructions provided with your
transmitter.
DO NOT wire the 24 Volt Power Supply across the input of the
control. Damage to the control input circuitry will result.
WIRING FOR TRANSMITTER INPUTS USING INTEGRAL
POWER SUPPLY
Wire power and outputs as shown on previous page. Wiring for two-wire
transmitters shown below in Figure 3. All wiring shown in Figure 3 is Class 2.
USE OF SNUBBERS WITH INDUCTIVE LOADS
A snubber is a resistance/capacitance device that is used to reduce or eliminate
high voltage spikes generated from inductive loads. For best effect, the snubber
should be mounted as close to the coil as physically possible. Electrical and typical
physical characteristics are shown above.
Failure to use a snubber on an inductive load may cause erratic
operation and/or premature relay contact wear.
SNUBBER
COIL OF RELAY
OR MOTOR STARTER
SWITCHED AC
(FROM CONTROLLER)
1-1/4
7/8
9/16 THICK
SNUBBER PHYSICAL
CHARACTERISTICS (TYPICAL)
4
3/8
Use of a fuse (1/8W Fast-Blow) in
the loop is recommended to
protect the control input circuitry.