Product Overview 1-15
Ground Fault
In isolated or high impedance-grounded systems, core-balanced
current sensors are typically used to detect low level ground faults
caused by insulation breakdowns or entry of foreign objects.
Detection of such ground faults can be used to interrupt the system to
prevent further damage, or to alert the appropriate personnel to
perform timely maintenance.
The SMC-Flex’s ground fault detection capabilities consist of
installing a Cat. No. 825-CBCT core balance current transformer for
1…5A core-balanced ground fault protection with the option of
enabling Ground Fault Trip, Ground Fault Alarm, or both.
Figure 1.17
➀ Customer supplied.
➁ Cat. No. 825-CBCT
Ground Fault Trip
The SMC-Flex will trip with a ground fault indication if:
• No other fault currently exists
• Ground fault protection is enabled
• GF Inhibit Time has expired
• GF Current is equal to or greater than the GF Trip Level for a
time period greater than the GF Trip Delay
BLACK
WHITE
SHIELD
SHIELD
BLACK
WHITE
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