The CCR alarm system
A CCR watches its own supply, output and temperature, and the circuit it feeds. It sorts what it finds into warnings and trips and reports them.
1Warnings and trips
A warning reports a condition that needs attention while the lights keep running. A trip shuts the output down because continuing is unsafe, for example an open circuit or over-temperature.
2Where alarms go
Alarms show on the display, can close a relay output and can be sent over a communications link to the ALCMS, where they are logged with a time stamp for the maintenance team.
3Respond in order
Record the alarm and the CCR state first. Before you open the cabinet or touch the circuit, isolate, lock out and prove dead. Then find the cause and fix it before you reset. Tell airfield operations if the lighting is affected. Resetting without finding the cause can hide a hard fault, and a repeating alarm needs fixing, not clearing.
| Element | Detail |
|---|---|
| Warning | Condition needing attention; output continues |
| Trip | Output shut down for safety |
| Common alarms | Supply loss or out of range, over-temperature, output overcurrent, open circuit, circuit insulation or earth leakage on monitored models |
| Reporting | Display, relay contacts, ALCMS link |
| Record | Time-stamped event log where the system provides one |
| Response | Record, then isolate and prove dead before any work, diagnose, fix, then reset; inform airfield operations if lighting is affected |
Frequently Asked Questions
Q1What is the difference between a warning and a trip?
A warning flags a condition while the CCR keeps running. A trip shuts the output down because continuing could be unsafe.
Q2Why should I find the cause before resetting?
A reset clears the alarm, not the fault. On a high-voltage series circuit a hard fault can come straight back and cause damage.
Q3How does the ALCMS learn about CCR alarms?
Through relay contacts or a communications link from the CCR. The ALCMS logs and displays them, depending on the interface.
Q4What if an alarm keeps coming back?
Treat it as a real fault. Look at the event log for a pattern and trace the cause rather than resetting repeatedly.
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