ZETRON 4000 Series, Installation Manual

Page: 103 / 418

103
Wiring to the Alarm Circuit
Wiring to the Alarm Circuit
The alarm circuitry of the CCE can be used to give an external indication of both external
and internal events. Alarm sources include an external contact monitor, a monitor of
circuit card “ERROR” indicators, and a low-voltage monitor for the Model 4048 Power
Supply. When an alarm condition is detected, a relay contact closes and may activate a
lamp and/or beeper to give visual and/or audible indication to operators and/or service
personnel. When enabled, the voltage monitor signal from the Model 4048 Power Supply
will alarm if the voltage drops below a fixed threshold. Table 43 shows the Model 4048
Power Supply voltage alarm thresholds as measured at front panel test points. The Model
4020 Modular Power Supply does not generate a voltage monitor signal.
Table 43: Power Voltage Alarm Thresholds
The external contact monitor is always enabled. However, jumpers are used to enable or
disable monitoring of “ERROR” indicators and low-voltage. Table 44 shows the various
positions of the jumpers. The jumpers are located on the card cage backplane near J16 at
the top left corner.
Table 44: Common Control Alarm Enable/Disable Jumpers
The external alarm input signals and the alarm output signals are located at connector J16
on the top left corner of the back of the console card cage. The connector is a removable
terminal block. Table 45 shows the signal connections of the alarm connector.
Power Supply Alarm Threshold
+12V 11.95
+5V 4.6
-12V -11.00
Battery 11.1
Alarm Status Jumper Position
“ERROR ALARM” enabled JP2-ON
“ERROR ALARM” disabled JP2-OFF*
“VOLTAGE ALARM” enabled JP1-ON
“VOLTAGE ALARM” disabled JP1-OFF*
* factory default