Delta MM300 Instruction Manual Page 33

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2–14 MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
ELECTRICAL INSTALLATION CHAPTER 2: INSTALLATION
2.2.3.1 Phase current inputs (IO_A module)
Figure 16: Typical phase current input connections
The MM300 has three channels for phase current inputs, each with an isolating
transformer. The phase CTs should be chosen so the FLA is not less than 50% of the rated
phase CT primary. Ideally, the phase CT primary should be chosen such that the FLA is
100% of the phase CT primary or slightly less, never more. This will ensure maximum
accuracy for the current measurements. The maximum phase CT primary current is
1000 A.
CAUTION
CAUTION:
Polarity of the phase CTs is critical for negative-sequence unbalance calculation,
power measurement, and residual ground current detection (if used).
Power flow
D1
D2
D4D3
Phase current inputs
D5
D6 D7
CT1 CT2 CT3
D8
G/F
D1
D2
D4D3
Phase current inputs
D5
D6 D7
CT1 CT2 CT3
D8
G/F
D1
D2 D4D3
Phase current inputs
D5
D6 D7
CT1 CT2 CT3
D8
G/F
Two CT Connection
Direct Connection
Residual Ground Connection
Power flowPower flow
Power flowPower flow
853753A1.cdr
A
C
B
Power flow
+
D1
D2
D4D3
Phase current inputs
MM300
Motor Management System
To switchgear
ground bus
853744A2.CDR
D5
D6 D7
CT1 CT2 CT3
Control power
LN
D8
G/F
Contactor
R
I
CBCT /
50 : 0.025
Core Balance (Zero Sequence)
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