Kikusui PLZ-U Series User Manual

A-4 Appendix PLZ-U
A.2.2 Operation of the CR Mode
In CR mode, the PLZ-U supplies current proportional to the voltage variation.
■ CR mode operation
When the PLZ-U is used in CR mode, the PLZ-U operates as a resistive load as
shown in Fig. A-4. When the voltage (V1) of the constant-voltage power supply is
varied, the PLZ-U supplies current to meet I=V/R according to the specified resis-
tance R.
Fig. A-4 Equivalent circuit of the constant resistance load and operation
■ Transition of the operating point: Overpower protection (OPP)
We will consider the case when checking the load characteristics of the constant-
voltage power supply of Fig. A-4 using CR mode.
Fig. A-5 Transition of the operating point in CR mode (OPP trip point)
If the overcurrent protection (OCP) setting I
OCP
is greater than the current value I
B
at point B, when the PLZ-U resistance is decreased (R
1
→R
2
→R
B
) and the input
current (load current) is increased with the voltage of the constant-voltage power
supply at V1, the operating point moves along segment AB (A
1
→A
2
→B). When
point B is reached, overpower protection (OPP) trips. At this point, two types of
operation are available on the PLZ-U depending on the protection action setting of
the OPP.
I
V
PLZ-U Series
Constant voltage
power supply
Resistance (V/I) is constant
even when the voltage and
current change
Input current I
Input voltage V
0
R
V1
Input current [A]
Input voltage [V]
Logarithmic scale
V1
A
B
Constant power line
(OPP setting)
Operating area
OPP trip point
Constant resistance line
(Constant resistance settings:
R
1, R2, and RB)
I
B
IOCP
A1
A2
R1
R2
RB

Kikusui PLZ-U Series Specifications

General

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