AuCom MVE series User Manual page 27

INSTALLATION
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
•
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
500:1
1000:1
Example settings for S1
•
NOTE
Dip switch 1 on S1 is closest to the control terminal connectors. Dip switch 4 is closest to the CT connectors.
26
| MVE User Manual (710-17074-00G)
L1 L2 L3
1
3
Zero sequence CT ratio
1000:1
1000:1
L11
L12
L21
2
L22
L31
L32
GF1
4
GF2
0 0
1 1
= 1100
Switch setting
1010
1100