Hardware maintenance tools 9-3
Meridian SuperNode MSL-100 Intelligent Peripheral Equipment (IPE) Reference Manual MSL14
XSM indicators
System Options 211 are equipped with the Extended System Monitor (XSM,
NT8D22AC). This XSM monitors power supply failures from these sources:
•
Power supply
•
Ringing generator
The XSM also monitors for temperature alarms from these sources:
•
Fan unit or blower unit
•
Column temperature sensors
In multiple-column systems, there is one master XSM and multiple slave
XSMs. A switch setting on each XSM defines the card as the master or as a
slave.
If a fault is detected, the XSM does the following.
•
Displays alarm LED on the top column cabinet
•
Alarms the Power Fail Transfer Unit to activate the system line transfer.
•
Activates the tripping signals for a DC system when the column exceeds
the high temperature threshold
There are two types of module power supplies:
•
Peripheral equipment power supply
•
Ringing generator
The XSM handles complete or partial failures in a module power supply as
follows:
•
If output voltage is higher than the threshold for +5 volts, the affected
power supply shuts down, the column LED lights, and scan points activate
alarms.
•
If output voltage is higher than the threshold for other than +5 volts, power
for only that voltage shuts down in the effected power supply, the column
LED lights, and scan points activate alarms.
•
If output voltage is lower than the threshold for any voltage, power for only
that voltage shuts down in the effected power supply, the column LED
lights, and scan points activate alarms.
•
If input voltage is lower than the threshold, the effected power supply shuts
down then recovers when the input level recovers.
