6-10
PAN-A
■
Symptom 2: When you turn on the POWER switch, it is
turned off or the "ALM" LED lights up.
Check item
Cause and remedy
Check that switch S4 on
the control panel has not
been set to on (upper posi-
tion).
•
The overcurrent protection circuit has
been activated.
Switch S4 should be off (lower position) when
output current control using an external resis-
tor is not carried out.
Check that control wires
are secure in controlling
output with external resis-
tor.
• The overcurrent protection circuit has been
activated.
Connect the control wires correctly by refer-
ring to "4.3.3 Controlling output current with
external resistor"
Check that a switch used
for switching the resistor
is not open during switch-
ing in external resistor-
based control.
• The overcurrent protection circuit has been
activated. Replace the switch with a shorting-
type or continuous-type switch.
See the CAUTION note in "4.3.3 Controlling
output current with external resistor"
Check that input voltage is
not distorted into a square
waveform.
• The voltage detection circuit of the phase con-
trol circuit has been activated.
If the crest factor of input voltage is 1.2 or
less, the phase control circuit may malfunc-
tion. In this case, use a regulated AC power
supply as an input source. The capacity of the
regulated AC power supply requires at least
twice the power consumption (VA) of the unit.
Содержание PAN 110-1.5A
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