Kikusui PAD-L III Series, Operation Manual

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3-4 Basic Operation PAD-L
3.2 Basic operation
There are two different modes for the unit: constant voltage (CV) mode, and the
constant current (CC) mode. Before starting to use the unit, determine which mode is
to be employed, and select the procedure suitable for the selected operation mode.
CAUTION
• To protect the load, preset the OVP trip point for either operation
mode.
3.2.1 OVP (OverVoltage Protection) trip point presetting
The overvoltage protection (OVP) function protects a load from unexpectedly high
voltage. If the OVP function is activated, the POWER switch is turned off. To turn
on the POWER switch again, wait for at least 60 seconds, then turn on the POWER
switch. In this case, lower the output voltage preset value. Otherwise, the OVP
function is reactivated when the POWER switch is turned on.
CAUTION
• The OVP trip point is factory-preset to approx. 110% of the rated
output voltage of the unit. When using the unit, preset to an OVP
trip point suitable for the load.
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NOTE
• To turn on the POWER switch again after OVP has been activated, wait for at
least 60 seconds after cutting off the output, then turn on the POWER switch.
Otherwise, the output cutoff circuit may remain latched, disabling the output.
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OVP trip point presetting for TYPE III and TYPE IV models
CAUTION
• For TYPE III and TYPE IV models, the OVP trip point voltage is
output to preset the OVP trip point. Remove any load that has
been connected. After presetting the OVP trip point, always check
that the OVP trips at the set voltage.
1. Check that nothing is connected to the unit output terminals.
2. Use a slotted head screwdriver to turn the O.V.P variable resistor to the
extreme clockwise position.
3. Turn the CURRENT setting knob clockwise.
Turning it slightly is sufficient, since no current flows at no load.
4. Turn on the POWER switch.