S&C Instruction Sheet 1041-540 31
Overcurrent Fault Protection
Click on the
Overcurrent Fault
button on any screen to open the
OVERCURRENT
FAULT MENU
screen, and then click the
Power Outages
button.
Ac Power
Outages Log
Figure 7. The
OVERCURRENT FAULT: AC Power Outages
screen.
The
OVERCURRENT FAULT: AC Power Outages
screen shows a chronological listing
of voltage outage events. See Figure 7. The record for each event includes the date, time,
and phase status for each event.
An event is recorded each time:
• Voltage drops below the
Loss of Voltage Threshold
setpoint on any phase.
• Voltage rises above the
Loss of Voltage Threshold
setpoint.
The log can hold information for 16 events. Once the log is full, each new event over-
writes the oldest event in the log. To find the most recent event, look for the message
with a timestamp that is
older
than the time for the message above it.
This screen includes the following fields:
Date/Time……MSec
This is the time (to the nearest 6.25 milliseconds) when the event began. This time is
logged as soon as the event occurs.
Event
This is the phase, and switch if applicable, on which the voltage loss event occurred, for
example, A2, C1, G2, or Control Power.
NOTE:
The switch control records a control power voltage loss event whenever the
Power Supply/Control I/O module detects loss of ac power and switches to battery
backup power.
