40 User’s Manual PLZ-5W
Basic Functions
Alarm Function
This function detects anomalies and protects the DUT.
Alarm types and operation
There are two types of alarm based on urgency level: alarm 1 (high urgency) and alarm 2 (low urgency).
Alarm 1 (high urgency)
This alarm detects anomalies and automatically turns off the load. The operating conditions of this alarm
are fixed. When alarm 1 occurs, immediately remove the cause(s) of the alarm.
Alarm 2 (low urgency)
This alarm protects the DUT. The operating conditions of this alarm can be set freely within a given range.
Name Display Operating condition When
activated
Overvoltage
detection
OVP Alarm Voltage that is equal to or exceeds 110 % of the maxi-
mum voltage of the range is applied to the load input
terminals.
Load off
Reverse
-connection
detection
Reverse Alarm A reverse voltage (-0.6 V) is applied to the load input
terminals. Or, a reverse current (approx. -1 % of the
range rating) is flowing.
Load off
Overheat detection
*1
*1. Check whether the air inlet on the front panel and the air outlet on the rear panel are being obstructed.
OTP Alarm The temperature of the internal devices exceeds the
standard.
Load off
Alarm input
detection
*2
*2. First clear the signal input to the EXT CONT connector, then clear the alarm of the PLZ-5W.
External Alarm A signal between 1.5 V and 0 V is applied to ALARM
INPUT (pin No. 6) of the EXT CONT connector.
Load off
Front-panel load
input terminal over-
current detection
Front Alarm A current of 80 A or higher is flowing through the front
panel load input terminals.
Load off
Parallel operation
anomaly detection
See the reference. An anomaly occurred during parallel operation (p.109). Load off
Name Display Operating condition When
activated
Overcurrent
protection (OCP)
OCP Alarm Current at or exceeding the OCP setting (0 % to
110 % of rated current) flows (p.42).
Select load
off or limit.
Overpower
protection (OPP)
OPP Alarm Power at or exceeding the OPP setting (0 % to 110 %
of rated current) is applied (p.43).
Select load
off or limit.
Undervoltage
protection (UVP)
*1
*1. UVP can be set to off.
UVP Alarm The voltage becomes equal to or less than the UVP
setting (0 V to 150 V) (p.44).
Load off
Watchdog
Protection (WDP)
Watchdog Alarm SCPI communication is not performed for a length of
time that is equal to or exceeds the watchdog protec-
tion setting (p.45).
Load off
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