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Transcript
Basic Precipitator Control Troubleshooting Particulate Collection Within A Precipitator Precipitator operating and optimizing products 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 Electrical ground within precipitator Low or no primary and secondary voltage, high or rated primary and secondary current 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 Cause Low 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 Primary volts are normal, while the secondary and primary currents are much lower than normal Cause Heavy particulate buildup on discharge electrodes causing corona quenching and reduced free electron formation Basic Precipitator Troubleshooting Indication Cause No sparking is occurring and no electrical limit is being reached Defective control components Defective or improperly sized CLR Basic Precipitator Troubleshooting Indication Cause Readings oscillate on a 2 to 3 second cycle Broken and swinging discharge electrode Basic Precipitator Troubleshooting Indication Cause Readings 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.