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PBZ
Protection Features and Alarms
Protection Feature Types
Overvoltage and overcurrent protection
These protection features are activated when the PBZ detects an output voltage or output
current that is greater than or equal to the protection activation point. You can use both the
overvoltage and overcurrent protection features in three different modes. You can set
different protection activation points in the positive and negative directions. The protection
feature uses the measurement feature’s measured points to perform detection.
Mode What is detected Action
Overvoltage
protection
OVP (OUTPUT-OFF)
A voltage that is
greater than or equal to
the protection
activation point
(voltage).
Output is turned off (the POWER
switch remains on).
OVP (POWER-OFF) After the output is turned off, the
POWER switch is turned off.
V-LIMIT (Voltage limit) The output voltage is limited to a
value just below the protection
activation point.
Overcurrent
protection
OCP (OUTPUT-OFF)
A current that is
greater than or equal to
the protection
activation point
(current).
Output is turned off (the POWER
switch remains on).
OCP (POWER-OFF) After the output is turned off, the
POWER switch is turned off.
I-LIMIT (Current limit) The output current is limited to a
value just below the protection
activation point.
ON OFF
ON ON
ON OFF
ON OFF
ON ON
ON ON
Output
Output
POWER
switch
Output
POWER
switch
Output
Output
POWER
switch
+OVP and +OCP
OVP and OCP
V-LIMIT and I-LIMIT
-OVP and -OCP
+V-LIMIT and +I-LIMIT
-V-LIMIT and -I-LIMIT
OUTPUT-OFF
POWER-OFF
V-LIMIT
I-LIMIT
Protection feature is activated
Protection feature is activated