Kikusui PLZ-30F, Инструкции по эксплуатации, Страница: 164 / 192

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 speci
fi ed 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
, R
2
, and R
B
)
I
B
I
OCP
A
1
A
2
R
1
R
2
R
B