PLZ-4WL
125
Operating Area
App.
Transition of the operating point: overcurrent protection (OCP)
When the overcurrent protection (OCP) setting I
OCP
is less than current I
N
at point N, the
voltage of the constant voltage power supply is V
M
. Current will not flow if the PLZ-4WL
voltage V
M0
is greater than V
M
. If the voltage of the PLZ-4WL is decreased so that V
M0
is
less than V
M
, current starts flowing. If the voltage is decreased further (V
M1
V
M2
V
L
) so
that the input current (load current) increases, the operating point moves along segment ML
(M
1
M
2
L).
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-4WL 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-4WL
returns to constant voltage (CV) mode, and the operating point moves along segment ML.
Point N
LOAD OFF
The load is turned off (no current flows).
The PLZ-4WL stops operating as a load.
LIMIT
The PLZ-4WL switches out of constant voltage (CV) mode.
Overpower protection (OPP) continues, and the PLZ-4WL operates
as a constant-power load.
Input current [A]
Input voltage [V]
Logarithmic scale
V
M
V
M0
V
L
V
M2
V
M1
Constant current line
(constant voltage setting)
Constant voltage line
Operating area
OCP activation point
(OCP setting)
M
N
I
N
I
OCP
M
1
M
2
L
Point L
LOAD OFF
The load is turned off (no current flows).
The PLZ-4WL stops operating as a load.
LIMIT
The PLZ-4WL switches out of constant voltage (CV) mode.
Overcurrent protection (OCP) continues, and the PLZ-4WL
operates as a constant-current load.
