Maintenance and Troubleshooting | 6-67
Alarm Type / Alarm Condition Description and Suggested Corrective Action
Fault Wheel Speed There is no signal from the Filter (Chopper) 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 opto-coupler cable to the Chopper Assembly for proper
connections and inspect it for damage (cuts, nicks, burn marks, etc.).
• Check the power on the Chopper Motor. Contact AMETEK to verify
operation before checking.
• 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.
Fault Board ADC One or both of the Microcontroller board’s discrete analog-to-digital
converters (ADC) 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.
Fault Chip ADC The Microcontroller board’s internal analog-to-digital converter (ADC) 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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