3.TROUBLESHOOTING AND ACTION TROUBLESHOOTING B-65285EN/03
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(2) For a separate serial detector
An alarm is determined from the bits of alarm 7. The table below
indicates the meaning of each bit.
OHA LDA BLA PHA CMA BZA PMA SPH
Alarm description Action
1 Soft phase alarm 2
1 Pulse error alarm
1 Zero battery voltage 1
1 Count error alarm 2
1 Phase alarm 2
Battery voltage decrease
1 LED error alarm
1 Separate detector alarm
An alarm for which no action number is given is
considered to be caused by a detector failure.
Replace the detector.
Action 1: Battery-related alarms
Check if a battery is connected. When the power is turned
on for the first time after a battery is connected, the zero
battery voltage alarm is issued. In such a case, turn off the
power, then turn on the power again. If the alarm is still
issued, check the battery voltage. If the battery voltage
decrease alarm is issued, check the voltage, and replace the
battery as required.
Action 2: Alarms that may be issued for noise
If an alarm is issued intermittently or after emergency stop
cancellation, noise is probably the cause. So, provide noise
protection. If the same alarm is still issued after noise
protection is provided, replace the detector.
Action 3: Alarm condition detected by the separate detector
If the separate detector detects an alarm condition, contact
the manufacturer of the detector for information on