Appendix B - Functional Operation
150-388-105-05, Revision 05
62
March 25, 2000
HLU-388 List 5
When the circuit is active, the system is compliant with Class A2 requirements of GR-1089. When the circuit is
not active, the system is compliant with Class A3 requirements of GR-1089.
When the GFD circuit detects a grounded loop, the line power is immediately removed from the spans and a PWR
FEED GND alarm is generated and displayed. The power is reapplied 30 seconds later as part of a new start-up
procedure. If the ground condition persists on the span, the power is removed again once the GFD circuit detects
the grounded loop.
The indication of the location of the ground fault can be obtained by monitoring the voltages on the spans on the
HLU side as it sequentially powers devices in subsequent spans.