148
PLZ-4WH
Operating Area
How constant resistance and constant voltage (CR+CV)
mode works
On the PLZ-4WH, you can add constant voltage (CV) mode to constant resistance (CR)
mode.
Constant resistance and constant voltage mode operation
When the PLZ-4WH is used in constant resistance and constant voltage mode (CR+CV), it
operates as a constant-resistive load and a constant-voltage load (shunt regulator) as shown
in the figure below. When the PLZ-4WH operates as a constant-resistive load and the voltage
V
M
of the constant-voltage power supply varies, the PLZ-4WH sinks current to maintain I = V/
R, with the specified resistance value R fixed. When V
M
is greater than V, the PLZ-4WH
operates as a constant-voltage load and keeps input voltage V constant even when the input
current I varies. Current does not flow when V
M
is less than or equal to V.
The PLZ-4WH switches between the two modes automatically. In the figure below, R
1
is the
internal resistance of the constant-voltage power supply. In constant-voltage (CV) mode, the
PLZ-4WH may operate unstably if R
1
is low.
Transition of the operating point: overpower protection (OPP)
In this example, we will assume that the discharge characteristic of a battery is being
measured.
When the overcurrent protection (OCP) setting I
OCP
is greater than current I
N
at point N, the
voltage of the battery is V
M
. In constant resistance (CR) mode, if the resistance is reduced
(R
M1
→
R
M2
→
R
N
) so that the input current (load current) increases, the operating point
moves along segment MN (M
1
→
M
2
→
N).
When the overpower protection (OPP) setting is P
N
, OPP is activated when point N is
reached.
At this point, one of two types of operations occurs, depending on the protection action
setting for OPP. If the protection action is set to LOAD OFF, the load turns off. If the protection
action is set to LIMIT, the PLZ-4WH sinks current as a constant-power load at point N. Even if
you attempt to decrease the resistance to increase the current, the current will not increase
beyond point N. If you increase the resistance to decrease the current, overpower protection
I
V
PLZ-4WH Series
Battery
V
M
R
1
Current I
Voltage
V
0
CV
Setting
The voltage is constant even
when the current varies.
The resistance is constant even
when the voltage and current vary.
CR operation
CV operation
Input current [A]
Input voltage [V]
Logarithmic scale
V
M
V
Q
Q
S
Constant power line
(constant voltage setting)
Constant voltage line
Operating area
OPP activation point
(OPP setting)
M
N
I
N
I
OCP
M
1
M
2
P
N
P
N1
R
M1
R
M2
R
N
Constant resistance line
(constant resistance settings: R
M1
, R
M2
, and R
N
)
Содержание PLZ1004WH
Страница 13: ...Installation and Preparation This chapter describes how to unpack and prepare this product before you use it 1 ...
Страница 28: ...28 PLZ 4WH Remote Sensing ...
Страница 29: ...Basic Functions This chapter explains the operations for each operation mode and other basic functions 2 ...
Страница 47: ...Advanced Operations This chapter explains ABC preset memory setup memory protection functions and the menu 3 ...
Страница 61: ...Sequences This chapter explains the sequence function Sequences 4 ...
Страница 83: ...External Control and Parallel Operation This chapter explains external control and Parallel Operation 5 ...
Страница 115: ...Maintenance This chapter describes the maintenance procedures including cleaning inspection and calibration 7 ...
Страница 127: ...8 Specifications This chapter contains the specifications and gives the dimensions of the PLZ 4WH ...
Страница 137: ...Appendix A Operating Area B Sequence Program Creation Table C Options ...