Maintenance and Troubleshooting | 6-77
Decimal Alarm
Bit Value Type Alarm Condition / Description and Suggested Corrective Action
0 1 Fault f: Filter wheel speed out of range
There is no signal from the Chopper (Filter) Wheel opto-interruptor, or the
Chopper Wheel speed is outside the normal range of 240–600 RPM.
Corrective Action:
Take appropriate safety precautions, open the Upper Enclosure, and:
• Check the power (15 V) on the opto-coupler cable to ensure there is power
being supplied to the Chopper Motor.
• Check the power on the Chopper Motor. Contact AMETEK to verify
operation before checking.
• Check the opto-coupler cable to the Chopper Assembly for proper connections
and inspect it for damage (cuts, nicks, burn marks, etc.).
Note: Contact AMETEK to verify operation before checking the following
components in the Chopper Assembly. To check or replace parts in
the Chopper Assembly, refer to “Chopper Assembly Maintenance” in this
section.
• Check the snap ring for the Chopper Shaft and ensure it is snug against
the bushing and/or check the Chopper Bearings (see “Chopper Assembly
Maintenance” in this chapter). Contact AMETEK to verify operation before
checking.
• Replace the Microcontroller board. Contact AMETEK to verify operation
before removing this board.
1 2 Fault f: On-board A/D not responding
One or both of the Microcontroller board’s discrete analog-to-digital converters
(A/D) is not responding.
Corrective Action:
Take appropriate safety precautions, open the Upper Enclosure, and:
• Replace one or both of the A/D converters. Contact AMETEK to verify
operation before removing these components.
• Replace the Microcontroller board. Contact AMETEK to verify operation
before removing this board.
2 4 Fault f: On-chip A/D not responding
The Microcontroller board’s internal analog-to-digital converter (A/D) is not
responding.
Corrective Action:
Take appropriate safety precautions, open the Upper Enclosure, and:
• Replace the Microcontroller board. Contact AMETEK to verify operation
before removing this board.
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