Kikusui PWX750ML, User Manual

Page: 15 / 110

PWX
15
1
Inst
allation
and Prep
aratio
n
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 PWX750ML 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
happens, the PWX750ML 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 PWX750ML series cannot absorb reverse current from the load. Therefore, if a regener-
ative 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 (R
D
) 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
Set constant current
Ammeter reading (mean value)
Set constant current
Ammeter reading (mean value)
I
O
R
D
E
O
Equivalent circuit of the PWX750ML Regenerative load
­ ＋
0
Reverse current
-
I
O
+
I
O
I
rp
R
D
(in Ω) ≤
R
D
: Reverse current bypass dummy load
E
O
: Output voltage
Irp: Maximum reverse current
EO (in V)
Irp (in A)
Load
Output current
CAUTION
Use a resistor with sufficient rated power for R
D
. If a resistor with insufficient rated power for
the circuit is used, resistor R
D
will burn out.