PEC Miniverter, Manual, Page: 9 / 16

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C. Automatic Current Control with Voltage Limiting
This control will maintain the converter
output current at a value preset by the
operator's control knob. A preset value
of output current will be held constant
within -+ 1% of the converter's full rated
current value over a range of 10% to
100% of output voltage under varying
load conditions during operation. For
example, the output of a 100 amp @ 12
volt converter will be held constant -+ 1
amp from 1.2 volts to 12 volts.
The voltage limit control is designed to
reduce load burning due to overvoltage
and prevent power interruption to the
load. Any increase in load resistance
will result in a decrease of output current
and the converter will be limited at its
rated voltage output.
This automatic current control can be used in operations where thickness must be accurately
controlled. It can eliminate costly overplating, grinding and stripping operations. An automatic
current control can be used in any type of operation where variations in solution, temperature,
thickness and contact area will adversely affect the work being done.
4.3 Automatic Voltage with Current Limit Operation Adjustment Procedure
All converters are shipped in the voltage mode of control unless otherwise specified at time of
order.
1. The "current density adjust" pot must be turned completely counterclockwise for automatic
voltage operation. This pot is located on the front panel of the integral control units or inside the
remote cabinet for remote control units. To adjust, remove the locknut and turn the pot with a
screwdriver completely counterclockwise, then replace and tighten the locknut.
2. The "limit adjust" pot should be turned completely clockwise. At this setting, the converter
current output will be limited at its full rated value. If a lower current limit point is desired, then
turn the pot counterclockwise to the desired setting. For example, setting the pot at midpoint will
limit the current to approximately half the rated output current. This pot is located on the front
panel of integral control units or inside the remote cabinet for remote control units. To adjust,
remove the locknut, turn the pot to the desired setting with a screwdriver, then replace and
tighten the locknut.
3. Turn the "output adjust" knob completely counterclockwise.
4. Energize the converter by pushing the start button.
5. Adjust the "output adjust" knob to the desired voltage level. The converter will hold the desired
voltage level constant for varying load conditions.
NOTE : Desired voltage level setting must be between 10% and 100% of the
full rated output voltage of the converter.
Figure 5 ??