RK3000 High Frequency Power Supply
Operating Manual
Page 16 of 73
conduction percentage versus the maximum permissible conduction percentage (100%).
The conduction percentage will also be affected by the level of sparking and arcing being
detected.
Secondary Current Limit
The Secondary Current Limit is typically programmed for the nameplate secondary
current rating of the transformer-rectifier being controlled. The Secondary Current Limit
prevents the transformer-rectifier from exceeding the programmed value. This limit can
be used to limit operation of the control below the transformer rated secondary current if
desired.
Secondary Voltage Limit
The Secondary Voltage Limit is typically programmed for the nameplate secondary
current rating of the transformer-rectifier being controlled. The Secondary Current Limit
prevents the transformer-rectifier from exceeding the programmed value. This limit can
be used to limit operation of the control below the transformer rated secondary current if
desired.
Spark and Arc Control Response
The default operating mode is for a spark to initiate a Phase Back, and a second spark
within the Arc Delay time to initiate a Quench. An alternate response of all sparks
initiating a Quench is available.
Spark Rate Control
This mode of operation allows a specific spark rate to be programmed into the control.
The control will then automatically readjust itself to maintain a spark rate equal to the
programmed rate.
Spark Sensitivity
Allows the detection of a spark to be based on a secondary voltage drop rather than a
secondary current increase.
Soft Arc
Where electrical noise, poor electrical grounds, or small signal to noise ratios exist, arc
detection can be performed based on a specific value of secondary voltage increase
simultaneously with a specific value of secondary current decrease.
Software Version
The display can be enabled to show the part number and the version of the software
presently being used in both the Keypad and Display Unit, and the Control Unit.
Physically opening up the control to check these items is no longer necessary.
Under Voltage Trip
– Primary / Secondary
If the primary voltage level drops below the programmed Primary Under Voltage Trip
Level, for longer than the number of seconds programmed into the Under Voltage Timer
(see Preprogrammed Levels And Operating Ranges, page 68) and the Primary Current is
more than 20% of its rated value, the control will automatically de-energize. This feature
reduces clinker formation due to full hoppers, increases discharge electrode life by
eliminating energization of slack wires caused by full hoppers, and reduces the chance of
support insulator failure due to tracking.
The same above control function occurs if the under voltage trip is programmed for
Secondary Under Voltage Trip instead of Primary.
Under Voltage Timer
When an under voltage condition is detected (primary or secondary voltage operating
below their under voltage set point level) a delay time can be set to delay the tripping of
