Kikusui PLZ-4W Series, Руководство пользователя

Страница: 201 / 218

PLZ-4W Appendix A-9
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)
■
Transition of the operating point: Overcurrent protection (OCP)
Fig. A-11 Transition of the operating point in CV mode (OCP trip point)
We assume that the overcurrent protection (OCP) setting I
OCP
is less than current I
N
at
point N and denote the voltage of the constant voltage power supply as V
M
. When the volt-
age of the PLZ-4W is equal to V
MO
(V
MO
> V
M
), no current fl ows. When the voltage of
the PLZ-4W is decreased to a point in which V
MO
is smaller than V
M
, the current starts
fl owing. If the voltage is decreased further (V
M1
→ V
M2
→ V
L
) to increase the input current
(load current), the operating point moves along segment ML (M
1
→
M
2
→
L
).
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)
Point N
LOAD OFF
Turns off the load (stops the current fl ow).
The PLZ-4W no longer operates as a load.
LIMIT
CV mode ends. OPP continues, and the PLZ-4W
sinks current as a constant power load.
Point L
LOAD OFF
Turns off the load (stops the current fl ow).
The PLZ-4W no longer operates as a load.
LIMIT
CV mode ends. OCP continues, and the PLZ-4W
sinks current as a constant current load.
Input current [A]
Input
voltage [V]
Log scale
V
M
V
M0
V
L
V
M2
V
M1
Constant current line
(OCP setting)
Constant voltage line
(Constant voltage setting)
Operating area
OCP trip point
M
N
I
N
I
OCP
M
1
M
2
L