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Basic Precipitator Control Troubleshooting
Precipitator operating and optimizing products
Particulate Collection Within A Precipitator
Basic Precipitator Troubleshooting
“Normal Meter Readings”Electrical Reading are shown on meters for illustrative purposes. Actual readings may be on analog meters, digital displays, or a
combination of both.
Basic Precipitator Troubleshooting
Indication Cause
One “meter” has abnormal reading while others are within normal ranges
Metering problem
Basic Precipitator Troubleshooting
Indication Cause
Under Voltage Trip
Low or no primary and secondary voltage, high or rated primary and secondary current
Electrical ground within precipitator
Electrical ground within TR tank
Electrical ground within precipitator
Basic Precipitator Troubleshooting
Indication Cause
Over Current Trip SCR shorted
Control malfunction
Basic Precipitator Troubleshooting
Indication Cause
SCR Imbalance Trip One or more bad SCRs
Failure of the SCR firing circuit
Basic Precipitator Troubleshooting
Indication Cause
No primary or secondary current, high or rated voltages
No load on TR
Basic Precipitator Troubleshooting
Indication Cause
Breaker trips Short to ground before SCRs
Bad breaker
Basic Precipitator Troubleshooting
Indication CauseLow voltages and low currents
Excessive sparking in precipitator
Electrical noise on return signal (s)
Overloaded Precipitator
Basic Precipitator Troubleshooting
Indication Cause
No power after electrical repairs in control cabinet
Power phasing has been switched
Basic Precipitator Troubleshooting
Indication Cause
Primary volts are normal, while the secondary and primary currents are much lower than normal
Heavy particulate buildup on discharge electrodes causing corona quenching and reduced free electron formation
Basic Precipitator Troubleshooting
Indication CauseNo sparking is occurring and no electrical limit is being reached
Defective control components
Defective or improperly sized CLR
Basic Precipitator Troubleshooting
Indication CauseReadings oscillate on a 2 to 3 second cycle
Broken and swinging discharge electrode
Basic Precipitator Troubleshooting
Indication CauseReadings oscillate on a 10 to 15 second cycle
Swinging discharge electrode lower steadying frame
Basic Precipitator Troubleshooting
Comparing like areas of the precipitator can reveal problems that are not obvious from a glance of the electrical readings
Consistent differences between the chambers indicates possible gas flow or loading problems.
Basic Precipitator Troubleshooting
When electrical levels change on just one TR control the problem is usually within that control or bus section.
When electrical levels change on all the TR controls the problem is usually associated with the process.