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CHAPTER 2: INSTALLATION
MM200 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
Figure 2-10: CBCT ground CT connection - LO and HI inputs
-
CONTROL
POWER
+
24 VDC
RESET
FIELD START
FIELD STOP
M
LO
The exact placement of a zero-sequence CT to detect only ground fault current is shown
below. If the core balance CT is placed over shielded cable, capacitive coupling of phase
current into the cable shield during motor starts may be detected as ground current unless
the shield wire is also passed through the CT window. Twisted-pair cabling on the zero-
sequence CT is recommended.
Figure 2-11: Core balance ground CT installation, shielded cable
SECONDARY CONNECTION
A10
-
CONTROL
A9
POWER
+
VAC
A8
A7
A6
A5
A4
A3
A2
A1
NOTE: AC power and AC input wiring shown.
CORE BALANCE CT
TO MM200 IED
(TWISTED PAIR)
POWER CABLE
TO MOTOR
BOTTOM OF
MOTOR STARTER
COMPARTMENT
ELECTRICAL INSTALLATION
A10
N
L
RESET
FIELD START
FIELD STOP
M
HI
CABLE LUGS
TO SOURCE
TERMINATION
STRESS CONE
SHIELD GROUND
CONNECTION
SPLIT-BOLT CONNECTOR
IMPORTANT: FOR SHIELDED
CABLE, THE GROUND WIRE
MUST PASS THROUGH THE
CT WINDOW.
50:0.025 CORE BALANCE CT
FOR GROUND SENSING
TO STARTER
GROUND BUS
888712A1.CDR
N
A9
L
A8
NR
RETURN
A6
A5
A4
A3
A2
A1
888742A3.cdr
2–9
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