Kikusui PLZ-4WH Series User Manual page 149

(OPP) is cleared. The PLZ-4WH returns to constant resistance (CR) mode, and the operating
point moves along segment MN.
If the overpower protection (OPP) setting is P
activated as resistance is reduced so that the current is increased, the operating point
reaches point S.
At point S, the PLZ-4WH switches to constant voltage (CV) mode. The voltage is fixed at the
user-specified voltage V
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
the activation of overpower protection (OPP), the voltage of the battery is V
resistance (CR) mode, if the resistance is decreased (R
current (load current) increases, the operating point moves along segment MT (M
When the overcurrent protection (OCP) setting is I
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-4WH returns to constant resistance (CR)
mode, and the operating point moves along segment MT.
If the overcurrent protection (OCP) setting is I
not activated as resistance is reduced so that the current is increased, the operating point
reaches point S.
At point S, the PLZ-4WH switches to constant voltage (CV) mode. The voltage is fixed at the
user-specified voltage V
determined by the voltage and internal resistance of the battery.
PLZ-4WH
The load is turned off (no current flows).
LOAD OFF
The PLZ-4WH stops operating as a load.
Point N
The PLZ-4WH switches out of constant resistance (CR) mode.
LIMIT Overpower protection (OPP) continues, and the PLZ-4WH
operates as a constant-power load.
The operating point moves along segment QS. The current is
Q.
Operating area
R
M1
R
T
R
M2
M
M
1
V
M
M
2
T
S
Q
V
Q
Constant voltage line
(constant voltage setting)
I
Logarithmic scale
OCP
Input current [A]
The load is turned off (no current flows).
LOAD OFF
The PLZ-4WH stops operating as a load.
Point T
The PLZ-4WH switches out of constant resistance (CR) mode.
LIMIT Overcurrent protection (OCP) continues, and the PLZ-4WH
operates as a constant-current load.
. The operating point moves along segment QS. The current is
Q
, because overpower protection (OPP) is not
N1
Constant resistance line
(constant resistance settings: R
OCP activation point
(OPP setting)
Constant current line
(OCP setting)
I
OCP1
is lower than the current produced by
OCP
→R
M1
, overcurrent protection (OCP) is
OCP
, because overcurrent protection (OCP) is
OCP1
Operating Area
, R , and R )
M1 M2 T
. In constant
M
→R
) so that the input
M2 T
→M →T).
1 2
App.
149