PAN-A
5-5
Chap
.5
Names and Functions of Controls
1
[10] VOLTAGE
This is used to set output voltage for constant voltage operation
mode. (10 turns)
[11] OVP
This is the OVP (overvoltage protection) control variable resistor, and
used to preset the trip point of the OVP circuit.
[12] Ammeter
Indicates the output current when the OUTPUT switch is turned on.
Indicates the output current limit when the LIMIT switch is pressed.
[13] CC
"CC" (Constant Current) LED is displayed when the unit is in its con-
stant current operation mode.
[14] ALM
"ALM" (alarm) LED lights up if any one of the following protection
circuits is activated.
1) Overvoltage protection circuit (OVP)
2) Overheat protection circuit (protects the semiconductor cooler
from becoming overheated)
3) Voltage detection circuit (protects smoothing capacitors in the
phase control circuit from overvoltage)
4) Overcurrent protection circuit (protects the internal circuit from
overcurrent caused by erroneous operation of external controls)
Circuits other than the overvoltage protection circuit are intended to
protect the internal circuit of the unit; a trip point cannot be set for
them. The overcurrent protection's trip point is set to approx. 110 %
of the rated output current.
In the case of the models 700W and 1000W, the POWER switch is
shut down as soon as the ALM lamp lights up, and all displays on the
panel go off. Except an alarm by the overcurrent protection circuit.
[15] Voltmeter
Indicates output voltage when the OUTPUT switch is turned on. Indi-
cates the output voltage limit when the LIMIT switch is pressed. Indi-
cates the OVP trip voltage when the PRESET OVP switch is pressed.
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