Kikusui PLZ164W User Manual page 193

PLZ-4W
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 by decreasing the
resistance, the current is limited at point B. If you decrease the input current by
increasing the resistance, the OPP is cleared. The PLZ-4W returns to CR mode, and
the operating point moves along segment AB.
Table A-2 OPP action (protect action)
LOAD OFF
Point B
■ Transition of the operating point: Overcurrent protection
(OCP)
Operating area
A A A
1 2
V1
R
1
R
2
R
F
Log scale
Input current [A]
Fig. A-6 Transition of the operating point in CR mode (OCP trip point)
If the overcurrent protection (OCP) setting I
point B, when the PLZ-4W resistance is decreased (R
rent (load current) is increased with the voltage of the constant-voltage power sup-
ply at V1, the operating point moves along segment AF (A
is reached, overcurrent protection (OCP) trips.
At this point, two types of operation are available on the PLZ-4W depending on the
protection action setting of the OCP.
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 current
load at point F. Even if you attempt to increase the input current by decreasing the
resistance, the current is limited at point F. If you decrease the input current by
increasing the resistance, the OCP is cleared. The PLZ-4W returns to CR mode, and
the operating point moves along segment AF.
Table A-3 OCP action (protect action)
LOAD OFF
Point F
Turns off the load (stops the current flow).
The PLZ-4W no longer operates as a load.
CR mode ends. OPP continues, and the PLZ-4W
LIMIT
sinks current as a constant power load.
Constant current line
(OCP setting)
F
B
Constant resistance line
(Constant resistance settings: R
I
I
B
OCP
OCP
Turns off the load (stops the current flow).
The PLZ-4W no longer operates as a load.
CR mode ends. OCP continues, and the PLZ-4W
LIMIT
sinks current as a constant current load.
OCP trip point
1
is less than the current value I
R R
) and the input cur-
1 2 F
A F). When point F
1 2
, R , and R )
2 F
at
B
Appendix A-5