RK3000 High Frequency Power Supply
Operating Manual
Page 50 of 73
CHAPTER 8
GAS LOAD ADJUSTMENTS
The following adjustments are to be made with the process gas flowing through the
precipitator. These adjustments are presented as starting points after the air load
adjustments have been completed.
Normal Operation
Starting with the precipitator inlet field transformer-rectifier controls, adjust the
programmable parameters on the keypad as follows (refer to the Programming
Instructions):
Program the Quench Mode for Arc Only Mode
Program the Pedestal Rate to 1 cycle
Program the Ramp Rate to 10 seconds
Program the Phase Back to 15 percent
Program the Process Sense to 30 seconds
Program the precipitator center field transformer-rectifier controls as follows:
Program the Quench Mode for Arc Only Mode
Program the Pedestal Rate to 1 cycle
Program the Ramp Rate to 8 seconds
Program the Phase Back to 20 percent
Program the Process Sense to 20 seconds
Program the precipitator outlet field transformer-rectifier controls as follows:
Program the Quench Mode for Arc Only Mode
Program the Pedestal Rate to 1 cycle
Program the Ramp Rate to 3 seconds
Program the Phase Back to 25 percent
Program the Process Sense to 10 seconds
Program intermediate precipitator field transformer-rectifier controls so they fall between
those outlined above.
High
– Resistivity Ash Operation
As a starting point for precipitators collecting high-resistivity ash-from the burning of low-
sulfur coal (for example), program all the controls for all fields as follows:
Program the Quench Mode for Arc Only Mode
Program the Pedestal Rate to 1 cycle
Program the Ramp Rate to 30 seconds
Program the Phase Back to 15 percent
Program the Process Sense to 90 seconds
Process Upset Operation
If conditions exist where normal operation includes frequent process upsets or fast
process changes (as encountered in the Basic Oxygen Furnace operation, for example)
and a minimum Spark rate is desirable, program all the controls for all fields as follows:
Program the Quench Mode for Arc and Spark Mode
Program the Pedestal Rate to 5 cycles
Program Ramp Rate and Phase Back as listed under Normal Operation
Program the Process Sense to 10 seconds
