Kikusui PLZ164W User Manual page 197

PLZ-4W
When point N is reached, overpower protection (OPP) trips. At this point, two types of oper-
ation 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 N. Even if you attempt to decrease the voltage, the current is limited at
point N. If you increase the voltage, the OPP is cleared. The PLZ-4W returns to CV
mode, and the operating point moves along segment MN.
Table A-5 OPP action (protect action)
LOAD OFF
Point N
■ Transition of the operating point: Overcurrent protection (OCP)
Operating area
V
M0
M
M
V
1
M
V
M
M1
2
V
M2
V
L
Constant voltage line
(Constant voltage setting)
Log scale
Input current [A]
Fig. A-11 Transition of the operating point in CV mode (OCP trip point)
We assume that the overcurrent protection (OCP) setting I
point N and denote the voltage of the constant voltage power supply as V
age of the PLZ-4W is equal to V
the PLZ-4W is decreased to a point in which V
flowing. If the voltage is decreased further (V
(load current), the operating point moves along segment ML (M
When point L is reached, overcurrent protection (OCP) trips. At this point, two types of oper-
ation 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 L. Even if you attempt to decrease the voltage, the current is limited at
point L. If you increase the voltage, the OCP is cleared. The PLZ-4W returns to CV
mode, and the operating point moves along segment ML.
Table A-6 OCP action (protect action)
LOAD OFF
Point L
Turns off the load (stops the current flow).
The PLZ-4W no longer operates as a load.
CV mode ends. OPP continues, and the PLZ-4W
LIMIT
sinks current as a constant power load.
Constant current line
(OCP setting)
N
L
I
I
OCP N
(V > V
MO MO M
V
M1
Turns off the load (stops the current flow).
The PLZ-4W no longer operates as a load.
CV mode ends. OCP continues, and the PLZ-4W
LIMIT
sinks current as a constant current load.
OCP trip point
is less than current I
OCP
M
), no current flows. When the voltage of
is smaller than V , the current starts
MO M
V
) to increase the input current
M2 L
M 
1 2
at
N
. When the volt-
).
L
Appendix A-9