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Transition of the operating point: overcurrent protection (OCP)
When the overcurrent protection (OCP) setting I
voltage of the constant voltage power supply is V
voltage V
less than V
that the input current (load current) increases, the operating point moves along segment ML
(M
1
When point L is reached, overcurrent protection (OCP) is activated. At this point, one of two
types of operations occurs, depending on the protection action setting for OCP.
If the protection action is set to LOAD OFF, the load turns off.
If the protection action is set to LIMIT, the PLZ-4WH sinks current as a constant-current load
at point L. Even if you attempt to decrease the voltage, the current will not increase beyond
point L. If you increase the voltage, overcurrent protection (OCP) is cleared. The PLZ-4WH
returns to constant voltage (CV) mode, and the operating point moves along segment ML.
PLZ-4WH
LOAD OFF
Point N
LIMIT
Constant current line
Operating area
(OCP setting)
V
M0
M
M
V
1
M
V
M1
M
2
V
M2
V
L
L
Constant voltage line
(constant voltage setting)
I
Logarithmic scale
OCP
Input current [A]
is greater than V
. If the voltage of the PLZ-4WH is decreased so that V
M0
M
, current starts flowing. If the voltage is decreased further (V
M
→M
→L).
2
LOAD OFF
Point L
LIMIT
The load is turned off (no current flows).
The PLZ-4WH stops operating as a load.
The PLZ-4WH switches out of constant voltage (CV) mode.
Overpower protection (OPP) continues, and the PLZ-4WH
operates as a constant-power load.
OCP activation point
N
I
N
is less than current I
OCP
. Current will not flow if the PLZ-4WH
M
The load is turned off (no current flows).
The PLZ-4WH stops operating as a load.
The PLZ-4WH switches out of constant voltage (CV) mode.
Overcurrent protection (OCP) continues, and the PLZ-4WH
operates as a constant-current load.
Operating Area
at point N, the
N
is
M0
→V
→V
) so
M1
M2
L
App.
145
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