Kikusui PAD-L III Series, Operation Manual

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2-4 Precautions and Preparations for Use PAD-L
2.3.2 When a load generates a reverse current to the power
supply
The PAD-L series is unable to absorb a reverse current from a load. Therefore, if a
power-regenerative load, such as an inverter, converter, or transformer that tends to
regenerate power to the power supply, is connected, the output voltage may increase,
resulting in unstable output.
To handle this type of load, connect a resistor (R
D
) to bypass reverse currents, as
illustrated in Fig. 2-3. Note that, if such a resistor is used, the current capacity for the
load decreases by Irp.
CAUTION
• Select R
D
with sufficient rated power. Use of a resistor with
insufficient rated power may burn R
D
.
I
OUT
R
D
E
O
Equivalent circuit
in the power supply
Power-regenerative load
– +
0
Reverse current
-I
O
+I
O
I
rp
R
D
[
Ω
]
≤
E
O
[V]
I
rp
[A]
R
D
: Dummy load for bypassing
reverse currents
E
O
: Output voltage
I
rp
: Maximum value of reverse
current
Load
Output-current
w
av
eform
Fig. 2-3 Countermeasure against a power-regenerative load