PAS SERIES Before Using the Unit 2-7
2.4 Alarm
The unit is equipped with the following protection function. When
the protection function is activated, "ALM" on the front panel display
lights, and the OUTPUT is turned off or the POWER switch is shut
down. However, the only action available when OHP is activated is
turning off the OUTPUT. (See Fig.2-8.)
In addition, an ALARM signal is output to pin 20 of the J1 connector
when the protection function is activated. (See Fig.2-9.)
For details on selecting whether to turn off the OUTPUT or shut
down the POWER switch when an alarm is activated, see "3.2.4 Unit
Configuration (CONFIG)".
When POWER switch shutdown is selected, the illumination of
"ALM" and the ALARM signal output is held for approximately 0.5 s.
Recovery from an alarm
• When POWER switch shut down is selected
After clearing the abnormal condition that
caused the alarm, turn
on the PO
WER switch.
• When OUTPUT OFF is selected
Turn off the POWER switch, clear the abnormal condition that
caused the alarm,
and turn on the POWER switch.
■ Prot
ection Function
• O
VP (overvoltage protection)
The overvoltage protection function protects a load from unexpect-
edly
high vo
ltage. The function is activated when the voltage exceeds
a preset voltage (OVP trip point).
Selectable range: 10 % to 110 % of the rated output voltage.
If the OVP function is activated when CONFIG is set to OUTPUT
OFF, the voltage display shows "OVP."
For details, see "3.2.2 Setting the OVP (Overvoltage Protection) Trip
Point".
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