Switch Sw1 - Ground Fault Detection - Honeywell HPF-PS6 Instruction Manual

System Overview
Value of the resistance in between any circuit terminal to Earth, which will cause the Ground Fault detection, depends on the ELR chosen for
inputs and output circuits. This resistance will vary from 9.9K down to 0 Ohm.
Table 1.2 lists the open/short trip values and restoral values in standby for the NAC circuits on the FACP.

1.5 Switch SW1 - Ground Fault Detection

The Ground Fault Detection circuit monitors for ground faults. Switch SW1 is located on the lower left section of the power supply circuit
board. Sliding SW1 to the left will disable ground fault detection by the power supply. This should only be done if ground faults are being
monitored by an FACP connected to the HPF-PS power supply or in a cascading application as shown in Section 2.8.1 on page 19.
10
Circuit Fault
NAC 1-5/7 Short
NAC 1-5/7 Open
ZNAC-PS 1-5/7 Short
ZNAC-PS 1-5/7 Open
Table 1.2 NAC Open/Short Trip Values
HPF-PS Series Instruction Manual — P/N LS10227-003HP-E:C 2/2/2022
Trip Resistance (in ohms)
1.6K or lower
55K or higher
1.6K or lower
45K or higher
Switch SW1 - Ground Fault Detection
Restore Value
1.7K or higher
33K or lower
1.7K or higher
21K or lower