Panasonic GPH5D - Manual (Page 34)

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Over-voltage protection (OVP) is provided via pin 6 of connector P16. This
voltage enters pin 4 of IC601 for immediate shutdown of the IC if the Vsus
voltage rises to an undesired level. The OVP feedback is also provided to the
system control circuit via pin 13 of connector P15 for immediate shutdown of the
entire unit.
The P7 (High Voltage Protector) and P8 (Low Voltage Protector) circuit boards
monitor the DC output of all power supply boards. If any of the inputs is higher
than the desired level, a DC level is output via the “SOS IN” line to pin 1 of
connector P16. The operation is the same as the OVP input at pin 6 of the
connector P16.