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ULSE
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OWER
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7
Front panel
2.2.1
Front panel, visual indicators
The summary alarm plug-in module has three front panel LEDs for indication of the state of the module. The following table shows the
operation of the front panel LEDs which are dependent on module type.
Colour
Status
LED1
GREEN
Normal
No light
No power
LED2
GREEN
LOAD ON (Any load resistor active)
No light
LOAD OFF
LED3
GREEN
Normal
Solid
RED
ALARM, acknowledged
Flashing
RED
ALARM, active
2.2.2
Front panel, reset switch
The hard reset switch is accessible via a small hole behind the handle. Under all normal operating circumstances it should not be required.
Actuating the hard reset will cause the module to reboot, the rack inventory table will be deleted.
2.2.3
Front panel, buzzer
The summary alarm plug-in module has a front panel mounted buzzer for indication of the modules
state. The following table shows the operation of the buzzer.
Buzzer
Status
OFF
No ALARM or ALARM acknowledged
ON
ALARM active
The buzzer operates with a nominal frequency of 2.4kHz, the tone is modulated.
2.2.4
Front panel, acknowledge switch
The ACKNOWLEDGE switch is housed on the front panel, this is used to acknowledge alarms. It works in a number of different modes after
the alarm is generated depending on the status of the slot module when the acknowledge switch is hit.
After the ACKNOWLEDGE switch is pressed the summary alarm card will continue to monitor for further alarms.
Front panel, acknowledge switch, slot alarm active, with I2C response, fail module
In this state the summary alarm module assumes that a faulty module is fitted in the slot. After pressing the ACKNOWLEDGE switch the
BUZZER is MUTED and the STATUS LED is in ALARM acknowledged state (see section 2.2.1). The status of the relays remains
unchanged.
Front panel, acknowledge switch, slot alarm active, with no I2C response, removed module
In this state the summary alarm module assumes that a faulty module has been removed. After pressing the ACKNOWLEDGE switch the
BUZZER is OFF and the STATUS LED is in normal state (see section 2.2.1). The relay will be in its normal state.
LED1
LED2
LED3
Buzzer
Reset
Switch
Acknowledge
Switch
