RK3000 High Frequency Power Supply
Operating Manual
Page 48 of 73
CHAPTER 6
AIR LOAD INSTRUCTIONS
The following steps must be performed prior to energizing the control in the automatic
mode for the first time. If at all possible, this procedure should be performed without
process gas entering the precipitator and under stack draft condition. This is designed
“Air Load Condition.”
Pre-Operating Checkout
:
1.
Ensure the On-Off switch on the control cabinet is in the off position.
2.
Ensure the control cabinet (or MCC/PDP) circuit breaker is in the off position.
3.
Open the control cabinet door.
4.
Place the AUTOMATIC-MANUAL switch located on the Interface Unit into the
MANUAL position.
5.
Turn the Manual Control potentiometer located on the Interface Unit to its full
counter-clockwise position.
6.
Energize the support insulator heaters at least two hours before performing
air load electrical control adjustments. Energization of the support
insulator heaters removes condensation that might have formed on the
insulator surfaces. Failure to remove condensation may result in electrical
tracking of the insulation surface. This in turn can result in electrically
grounded and/or physically damaged insulators that may have to be
replaced before the precipitator can be re-energized.
7.
Make sure the precipitator high voltage frame(s) is connected to the transformer-
rectifier (T/R). This should be checked at the T/R pipe and guard interface as
well as at the pipe and guard support bushing interface.
8.
Energize the transformer-rectifier control cabinet by placing the main circuit
breaker in the on position.
9.
Enter the code for clearing the memory. This initializes the microprocessor
control.
10.
Program the control for the correct “Max Set Size” and “Limits”. Also, each
Keypad and Display Unit must be programmed for all the Interface Unit IDs
on its communication loop. See Chapter 5, page 25, Programming
Instructions.
The following steps must be performed at each TR control cabinet.
11.
Turn the On-Off switch to on.
12.
Slowly turn the Manual Control potentiometer on the Interface Unit clockwise. As
the Manual Control potentiometer is slowly turned clockwise, the voltage and
current levels should start to increase. Keep slowly turning the Manual Control
until the end of its travel is reached.
As the Manual Control is rotated, observe the spark and arc LEDs on the
Interface Unit. During air load, where no particulate is entering the precipitator,
there should not be any sparking present. If sparking is occurring, allow the
control to sit for five or ten minutes and recheck. If sparks are still present there
is probably a problem inside the precipitator. Ambient air conditions, normal
buildups on collecting plates, or slightly moist or dirty insulators can also cause
this sparking. The cause must be determined and corrected before the
precipitator is placed on line or reduced collection efficiency will result.
13.
Place the On-Off switch on the front of the control cabinet in the off position.
