Ct Current Measurement - AuCom MVE series User Manual

6.13 CT Current Measurement

The MVE supports the summation and zero sequence methods of ground current measurement.
The line current transformers supplied with the soft starter are 1000:1 ratio. The MVE also supports customer-supplied 500:1 CTs
if required. If 500:1 CTs are used, the setting of switch S1 on the power interface board must be changed.
Summation method ground current measurement
Connection diagram: ground current summation CTs
•
1 Line current transformers (1000:1)
2 Ground current input to Power Interface PCB
3 Individual phase inputs to Power Interface PCB
Switch settings for summation 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
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.
L1 L2 L3
1
500:1
1000:1
3
Switch setting
0 0
1 1
= 1100
MVE User Manual (710-17074-00G) |
INSTALLATION
2
0100
1100
25