PLZ-U 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-U 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-U depending on the protection action setting
of the OPP.
If the function for turning off the load when the OPP trips is on, the load is turned
off.
If the function for turning off the load when the OPP trips is off (set to limit), the
PLZ-U supplies current as a constant power load at point B. Even if you attempt to
increase the input current, the current is limited at point B. If you decrease the input
current, the OPP is cleared. The PLZ-U returns to CC mode, and the operating point
moves along segment AB.
TableA-1 Action taken when the OPP trips
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-U is increased, the operating point moves along segment
CD. Point D is the maximum current at the range being used.
Point B
Load-off function
on
Turns off the load (stops the current supply).
The PLZ-U no longer operates as a load.
Load-off function
off (limit)
CC mode ends. OPP continues, and the PLZ-U
supplies current as a constant power load.
Input voltage [V]
Input current [A]
Logarithmic scale
A
B
C
Constant power line
(OPP setting)
Operating area
OPP trip poin
D
V1
V2
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