Kikusui PLZ-U Series User Manual

A-8 Appendix PLZ-U
If the function for turning off the load when the OCP trips is on, the load is turned
off.
If the function for turning off the load when the OCP trips is off (set to limit), the
PLZ-U supplies current as a constant current load at point L. Even if you attempt to
decrease the voltage, the current is limited at point L. If you increase the voltage,
the OCP is cleared. The PLZ-U returns to CV mode, and the operating point moves
along segment ML.
Table A-5 Action taken when the OCP trips
A.2.4 Operation of the CC+CV Mode
The PLZ-U allows you to add CV mode to CC mode.
■ CC+CV mode operation
When the PLZ-U is used in CC+CV mode, the PLZ-U operates as a constant current
load and a constant voltage load (shunt regulator) as shown in Fig. A-10. When
operating as a constant current load, the PLZ-U supplies the specified current (I)
independent of the output voltage of the constant-voltage power supply (V
M
). When
operating as a constant voltage load and V
M
is greater than V, the input voltage V is
kept constant even when the input current I varies. Current does not flow when V
M
is less than or equal to V.
The switching between the modes is automatic.
Fig. A-10 Equivalent circuit of the CC+CV mode and operation
■ Transition of the operating point: Overpower protection (OPP)
We will consider the case when checking the discharge characteristics of a battery
of Fig. A-10.
Point L
Load-off function
on
Turns off the load (stops the current supply).
The PLZ-U no longer operates as a load.
Load-off function
off (limit)
CV mode ends. OCP continues, and the PLZ-U
supplies current as a constant current load.
Battery
0
I
V
R1
V
Voltage is constant even when
the current changes
Current is constant even when
the voltage changes
VM
I
PLZ-U Series
Input current I
Input voltage V

Kikusui PLZ-U Series Specifications

General

Brand	Kikusui
Model	PLZ-U Series
Category	Control Unit
Language	English