12
PWR Series Setup Guide
Load Considerations
Note that the output will become unstable if the following types of loads are connected.
Load current with peaks and pulse-shaped load
current
The PWR indicates mean values. Even when the indicated value
is less than the preset current value, the peak values may actually
exceed the preset current value. If this happens, the PWR is instan-
taneously put into constant-current operation mode, and the output
voltage drops accordingly.
For these types of loads, you must increase the preset current
value or increase the current capacity.
Load current with peaks
Pulse-shaped load current
Preset constant current value
Ammeter reading (average value)
Preset constant current value
Ammeter reading (average value)
Load that generates reverse current to the power
supply
The PWR cannot absorb reverse current from the load. Therefore, if
a regenerative load (such as an inverter, converter, or transformer)
is connected, the output voltage increases and becomes unstable.
For these types of loads, connect a resistor (RD) as shown in figure
below bypass the reverse current. However, the amount of current
to the load decreases by Irp.
CAUTION
Select a resistor with sufficient rated power for RD. If a resis
-
tor with insufficient rated power for the circuit is used, RD may
burn out.
IO
RD
EO
-
＋
0
-IO
+IO
Irp
Equivalent circuit of the PWR
Regenerative load
Reverse current
O
utput cur
ren
t
w
av
ef
or
m
RD: Reverse current bypass dummy load
EO: Output voltage
Irp: Max. reverse current
RD[
Ω
] ≤
E
O
[V]
I
rp
[A]
Load
