Author – D. Rehe Feb 2020
On current trip and the controller is disabled and the trip relay energises and latches.
Current Trip can be rest by opening the ENABLE link or by turning off the mains supply
For F330 controllers fitted with CC,CCE option
7.A Bias(Zero) Adjustment
1. Set GAIN & AUX-V potentiometer(POT) fully anti-clockwise
2. Purchase a Current Clamp Meter similar as these Clamp Meters.
300 Amp True
RMS Clamp Meter
. Or for additional power quality features you can use this
1000
Amp True RMS Clamp Power Meter.
We reccommend the standard Current
Clamp for most applications as it comes with a impedance test functions which is
handy to verify failed SCR's or diodes by measuring Anode to Cathode and Gate
to Cathode for short circuits or low impedance.
See our Diode SCR Testing Blog
for the complete test procedure.
Note:
Bias Adjustment can be adjusted from -20% to +20%
7.B Minimum Control Input
1. Input the minimum Control Signal. I.e 0V, 4mA, or 10K POT to 0 position.
depending on the input required. Default is 4mA, for 4-20mA input control.
2. Clamp the DC output wire using the current clamp.
3. Set the BIAS POT to the centre position.
4. Input the minimum control input signal.
5. Gradually turn the AUX-V potentiometer clockwise until the output current is
around 5 Amp then adjust the Bias POT until you get zero current through the
load.
8.A Gain Adjustment
Apply the maximum control signal 10V, 5V, 20mA, or 10K POT position.
8.B Maximum Control Input
1. Turn the GAIN Potentiometer(POT) fully clockwise.
2. Gradually turn the AUX-V potentiometer clockwise until about 5 Amp more than
the maximum desired output current is measured. Be careful not to adjust to
higher over the maximum load or you may cause permanent damage to the SCR
due to overheating.
3. Adjust the GAIN POT until the output current is at the maximum desired level.
4. Recheck the output current at maximum and minimum control input and re-adjust
the Bia and Gain as necessary.
5. AUX-V POT controls the output voltage and can be left as a maximum limit or
adjusted as required taking care not to output overvoltage to the load.
9. Ramp/Soft Start Adjustment
The RAMP potentiometer(POT) sets the step response of the controller for any change
in the control input signal. Setting Range in the standard controller is between 1 and 20
