140
PLZ-4WH
Operating Area
■
Operation on segment CD
If the voltage of the constant-voltage power supply is set to V2 and the input current (load
current) of the PLZ-4WH is increased, the operating point moves along segment CD. Point D
is the maximum current in the range being used.
How constant resistance (CR) mode works
In constant resistance (CR) mode, the PLZ-4WH sinks current in proportion to the voltage
variation.
Constant resistance mode operation
When the PLZ-4WH is used in constant resistance (CR) mode, it operates as a resistive load
as shown in the figure below. When the voltage (V1) of the constant-voltage power supply
varies, the PLZ-4WH sinks current to maintain I = V/R, with the specified resistance R fixed.
This mode cannot be used with an AC circuit.
Transition of the operating point: overpower protection (OPP)
In this example, we will assume that the PLZ-4WH is being used in constant resistance (CR)
mode to test the load characteristic of a constant-voltage power supply.
If the overcurrent protection (OCP) setting I
OCP
is greater than the current value IB at point B,
when the PLZ-4WH resistance is decreased (R
1
→
R
2
→
R
B
) so that the input current (load
current) increases, 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) is activated.
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.
I
V
PLZ-4WH Series
Constant-voltage
power supply
The resistance (R) is constant even
when the voltage and current vary.
0
V1
Current I
Voltage
V
V
2
V
1
I
1
I
2
V
2
V
1
I
1
I
2
=
=
R
Input current [A]
Input voltage [V]
Logarithmic scale
V1
A
B
(OPP setting)
Constant power line
Operating area
OPP activation point
Constant resistance line
I
B
I
OCP
A
1
A
2
R
1
R
2
R
B
(constant resistance settings: R
1
, R
2
, and R
B
)
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 ...