46 PWR-01
Protection functions and Alarms
The PWR-01 protection functions can be divided into those that shut off the output and those
that limit settings.
Output shutoff
• Overvoltage protection (OVP) • Overcurrent protection (OCP)
• Front-panel output terminal overcurrent protection (FOCP)
• Overheat protection (OHP)
• Incorrect sensing connection protection (SENSE)
• Low AC input protection (AC-FAIL)
• Communication monitoring (WATCHDOG) • Shutdown (SD)
• Master-slave parallel operation protection (PRL ALM)
Setting limits
• Voltage setting limit (limited to about 95 % of the OVP trip point)
• Undervoltage limit (UVL)
• Current setting limit (limited to about 95 % of the OCP trip point)
• Power limit (POWER LIMIT)
Alarm occurrence and clearing alarms
Alarm occurrence
When the output is shut off by a protection function, an alarm occurs, and the PWR-01 is set
to the following state.
• Output off
• ALM LED on, indication of the cause of alarm
OUTPUT LED blinking orange if the protection function was activated when the output
was on
When a CONFIG parameter is being displayed, the cause of alarm is not displayed.
• Alarm signal output
Alarm signal generated from pin 14 of the J1 connector if PRL ALM or SD is activated
Alarm signal generated from pin 4 of the J2 connector if OVP, OCP, FOCP, OHP, SENSE,
AC-FAIL, WATCHDOG, or SD is activated
Clearing alarms
There are two methods to clear alarms.
a. Press ALM CLR (SHIFT+SET) or apply a low level signal (0 V to 0.5 V) to or short pin 6 of
the J1 connector to clear the alarm state. If you do not eliminate the cause of the alarm,
an alarm will occur again.
b. Turn off the POWER switch. Fix the problem that caused the alarm, and turn the POWER
switch back on.
For shutdown (SD) and master-slave parallel operation (PRL ALM), use method “b” to clear
the alarm.
If an alarm still occurs even after you have corrected all the causes of alarms, the PWR-01
may be malfunctioning. Stop using it immediately, and contact your Kikusui agent or distribu-
tor.
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