Terminal block and terminal descriptions
For information about the controller’s top terminal blocks, terminals, and wire sizes, see Table 1
and Figure 3. For information about the controller’s bottom terminal blocks, terminals, and wire
sizes, see Table 2 and Figure 3.
Note:
For detailed wiring guidelines and instructions, refer to the
MR5 Series Panel Mount Case
Controller Installation Guide (Part No. 24-07664-03388)
.
Figure 3: Back view of the MR5 terminal block connections
Table 1: Top wiring terminal blocks, terminals, and wire sizes
Terminal
number
Terminal
block
label
Terminal Description, function, and
requirements
Required wire size
1
SN3
SN3 is an optional temperature
sensor. Configure SN3 as a case
averaging sensor with SN1, or as
a defrost averaging sensor with
SN2.
2
SN2
The defrost termination
temperature sensor. Connect
either lead from the sensor to
SN2. Connect the other lead to
the common (C) terminal.
3
SN1
The case temperature sensor.
Connect either lead from the
sensor to SN1. Connect the other
lead to the C terminal.
4
Sensor
inputs
C
Common terminal for the
sensors.
0.30 mm
2
to 1.50 mm
2
(26 AWG to 22 AWG)
stranded wires and twisted-
leads cable
7
MR5 Series Panel Mount Case Controller Technical Bulletin
Discontinued
