PLZ-4WH
139
Operating Area
App.
How constant current (CC) mode works
In constant current (CC) mode, the PLZ-4WH maintains the same current even if the voltage
changes.
Constant current mode operation
When the PLZ-4WH is used in constant current (CC) mode, it operates as a constant-current
load as shown in the figure below. The PLZ-4WH sinks the specified current (I) regardless of
the output voltage (V1) of the constant-voltage power supply.
Transition of the operating point: overpower protection (OPP)
In this example, we will assume that the PLZ-4WH is being used in constant current (CC)
mode to test the load characteristic of a constant-voltage power supply.
■
Operation on segment AB
If the voltage of the constant-voltage power supply is set to V1 and the input current (load
current) of the PLZ-4WH is increased, the operating point moves along segment AB.
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.
If the protection action is set to LIMIT, the PLZ- 4W sinks current as a constant-power load at
point B. Even if you attempt to increase the input current, the current will not increase beyond
point B. If you decrease the input current, overpower protection (OPP) is cleared. The PLZ-
4WH returns to constant current (CC) mode, and the operating point moves along segment
AB.
PLZ-4WH Series
I
V
Constant-voltage
power supply
The current is constant
even when the voltage
varies.
Current I
Voltage
V
0
V
1
CC setting
Input current [A]
Input voltage [V]
Logarithmic scale
A
B
C
(OPP setting)
Constant power line
Operating area
OPP activation point
D
V1
V2
Point B
LOAD OFF
The load is turned off (no current flows).
The PLZ-4WH stops operating as a load.
LIMIT
The PLZ-4WH switches out of constant current (CC) mode.
Overpower protection (OPP) continues, and the PLZ-4WH
operates as a constant-power load.
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 ...