Specifications

Page 9–4
FOCUS System Manual
The red minor alarm LED is lit for any of these
conditions:
•Any channel module failure in a locked
chassis
• Removal of a channel module from a
locked chassis
• Failure of a single FOCUS power supply in
a dual power supply configuration
• Loss of carrier
•Failure of certain voltage regulator supplies
Whenever a remote user presses the PLOW
signaling pushbutton, the form A contacts labeled
“External Alert” will close. A SONALERT

or
similar audible device may be connected to alert
nearby persons to the incoming call.
To connect an external alert for receipt of order-
wire signaling, attach the wires to the screws in
positions 9 and 10. These positions are labeled
EXTERNAL ALERT.
9.5 Drawings
The schematic for the Power Supply Module is
available upon request.
The Power Supply component location drawing is
at the end of this chapter.
Yes Expansion Main Power Supply Failure
Expansion Chassis Main Power Supply was not detected by MM, and one is present
No Expansion Main Power Supply Failure CLEARED
Returned to normal
YesExpansion Standby Power Supply Failure
Expansion Chassis Standby Power Supply not detected by MM, and one is present
No Expansion Standby Power Supply Failure CLEARED
Returned to normal
YesMain Power Supply Failure
Main Power Supply was not detected by MM, and one is present
No Main Power Supply Failure CLEARED
Returned to normal
YesStandby Power Supply Failure
Standby Power Supply was not detected by MM, and one is present
No Standby Power Supply Failure CLEARED
Returned to normal
Yes Low V
oltage Failure
Bad status on both Main and Standby power supply
No Low Voltage Failure CLEARED
Returned to normal
ALARM, EVENT TEXT
,
CONCERN? EXPLANATION OF EVENT
Table 9–2. Power Supply Alarm Events
Some users have asked what action should be taken when experiencing different alarm conditions. The
following table is offered as a guide for this purpose.