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CHAPTER 2: INSTALLATION
CT ROW
239 MOTOR PROTECTION RELAY – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
Table 2–2: External Connections
SIGNAL LOWER ROW
31
Auxiliary NC
32
Service NO
33
Service COM
34
Service NC
V1 polarizing
35
(Mod 509 only)
* Safety Ground terminal. Minimum wire gauge - #12-gauge. Wire insulation must be
Green/Yellow coded, and must be connected to the rack ground or power distribution
ground before the unit is energized. Maximum screw torque for terminals 13 to 58, is 0.5
Nm (4.4 in-lb). Maximum screw torque for terminals 1 to 12, is 2.0 Nm (17 in-lb).
Possible shock hazard from backfeed due to potential multiple energy sources connected
to the unit.
SIGNAL UPPER ROW
54
RTD2 ret
55
RTD3 hot
56
RTD3 comp
57
RTD3 ret
Vcom polarizing
58
(Mod 509 only)
2–19
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