AuCom MVE series - CT Current Measurement (Zero Sequence Method)

INSTALLATION
26 | MVE User Manual (710-17074-00G)
Zero sequence method ground current measurement
NOTE
Zero sequence ground current measurement requires an additional customer-supplied ground current CT. In all
cases, the CT must be 1000:1, 1 VA, minimum protection class rating 5P10.
• Connection diagram: ground current zero sequence CTs
L1
L2
L3
L21
L22
L11
L12
L32
L31
GF2
GF1
2
4
1
17972.C
3
1
Line current transformers (1000:1)
2
Individual phase inputs to Power Interface PCB
3
Zero sequence current transformer (1000:1)
4
Ground current input to Power Interface PCB
• Switch settings for zero sequence method
NOTE
The soft starter will check the switch settings when control power is applied. If the switch settings are changed, control
power must be cycled for the new setting to take effect.
Line CT ratio
Zero sequence CT ratio
Switch setting
500:1 1000:1 1010
1000:1 1000:1 1100
• Example settings for S1
1 1
0 0
= 1100
16533.B
NOTE
Dip switch 1 on S1 is closest to the control terminal connectors. Dip switch 4 is closest to the CT connectors.