Device fault alarm – SATEC SA300 ezPAC Operation Manual User Manual
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Chapter 2 Device Description
Device Diagnostics
26
SA300 Substation Automation Unit
Device Fault Alarm
The SA300 provides a global "DEVICE FAULT" event flag that is asserted all the time
while one of the non-critical diagnostics events exists. It can be checked from a
setpoint (see
in Chapter 7) to give a fault indication via a
relay output. If the alarm relay is programmed for failsafe mode using inverting
polarity, then its normally closed contacts will be open if either the device looses
power or a non-critical device fault occurs. Note that in the event of a critical system
failure, all relay outputs are automatically released.
NOTE
The IRIG-B time faults may not be masked and may not be cleared externally. If the
IRIG-B time code signal is not provided, set the device time synchronization input to
any unused digital input (see
in Chapter 7) to avoid fault alarms
caused by the IRIG-B port.