PLZ-4W Appendix A-3
Fig. A-3 Transition of the operating point in CC mode (OPP trip point)
Fig. A-3: 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-4W is increased, the operating point moves along segment
AB.
When point B is reached, overpower protection (OPP) trips. At this point, two types
of operation are available on the PLZ-4W depending on the protection action setting
of the OPP.
If Protect Action is set to LOAD OFF, the load is turned off.
If 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 is lim-
ited at point B. If you decrease the input current, the OPP is cleared. The PLZ-4W
returns to CC mode, and the operating point moves along segment AB.
TableA-1 OPP action (protect action)
Fig. A-3: 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-4W is increased, the operating point moves along segment
CD. Point D is the maximum current at the range being used.
Point B
LOAD OFF
Turns off the load (stops the current flow).
The PLZ-4W no longer operates as a load.
LIMIT
CC mode ends. OPP continues, and the PLZ-4W
sinks current as a constant power load.
Input voltage [V]
Logarithmic
scale
A
B
C
(OPP setting)
Constant power line
Operating area
OPP trip point
D
V1
V2
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