PLZ-4WL
129
Operating Area
App.
(OPP) is cleared. The PLZ-4WL returns to constant resistance (CR) mode, and the operating
point moves along segment MN.
If the overpower protection (OPP) setting is P
N
1
, because overpower protection (OPP) is not
activated as resistance is reduced so that the current is increased, the operating point
reaches point S.
At point S, the PLZ-4WL switches to constant voltage (CV) mode. The voltage is fixed at the
user-specified voltage V
Q.
The operating point moves along segment QS. The current is
determined by the voltage and internal resistance of the battery.
Transition of the operating point: overcurrent protection (OCP)
When the overcurrent protection (OCP) setting I
OCP
is lower than the current produced by
the activation of overpower protection (OPP), the voltage of the battery is V
M
. In constant
resistance (CR) mode, if the resistance is decreased (R
M1
R
M2
R
T
) so that the input
current (load current) increases, the operating point moves along segment MT (M
1
M
2
T).
When the overcurrent protection (OCP) setting is I
OCP
, overcurrent protection (OCP) is
activated when point T is reached. 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- 4W sinks current as a constant-current load at
point T. Even if you attempt to decrease the resistance to increase the current, the current will
not increase beyond point T. If you increase the resistance to decrease the current,
overcurrent protection (OCP) is cleared. The PLZ-4WL returns to constant resistance (CR)
mode, and the operating point moves along segment MT.
If the overcurrent protection (OCP) setting is I
OCP1
, because overcurrent protection (OCP) is
not activated as resistance is reduced so that the current is increased, the operating point
reaches point S.
At point S, the PLZ-4WL switches to constant voltage (CV) mode. The voltage is fixed at the
user-specified voltage V
Q
. The operating point moves along segment QS. The current is
determined by the voltage and internal resistance of the battery.
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 resistance (CR) 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
Q
Q
S
Constant current line
(constant voltage setting)
Constant voltage line
Operating area
OCP activation point
(OCP setting)
(OPP setting)
M
I
OCP
I
OCP1
M
1
M
2
R
M1
R
M2
R
T
Constant resistance line
(constant resistance settings: R
M1
, R
M2
, and R
T
)
T
Point T
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 resistance (CR) mode.
Overcurrent protection (OCP) continues, and the PLZ-4WL
operates as a constant-current load.