Kikusui PWR401ML - Load Considerations

18 PWR-01
Load Considerations
Note that the output will become unstable if the following types of loads are connected.
Loads with peak current or pulse-shaped current
The PWR-01 only indicates mean values. Even when the indicated value is less than or equal
to the set constant current, the peak values may exceed the set constant current. If this hap-
pens, the PWR-01 is instantaneously put into constant-current mode, and the output voltage
drops.
For these types of loads, you must increase the set constant current or increase the current
capacity.
Loads that generate reverse current to the power supply
The PWR-01 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. This can cause a malfunction.
For these types of loads, connect a resistor (RD) as shown in the following figure to bypass
the reverse current. However, the amount of current to the load decreases by Irp.
Load current with peaks Pulse-shaped load current
Constant current setting
Ammeter reading (mean value)
Constant current setting
Ammeter reading (mean value)
I
O
RD
EO
Equivalent circuit of the PWR-01
Regenerative load
í
0
Reverse current
-IO
+IO
+
Irp
RDLQ
RD
: Reverse current bypass dummy load
EO: Output voltage
Irp: Maximum reverse current
(2LQ9
,USLQ$
Load
Output current
CAUTION
Use a resistor with sufficient rated power for RD. If a resistor with insufficient rated power for
the circuit is used, resistor RD will burn out.