No. P6972
P. 17/ 64
6. REQUIREMENT FOR INPUT POWER
6.1 Commercial input power
WARNING
Provide a leakage circuit breaker, when the welding power source is used at a place with
high humidity.
CAUTION
Be sure to provide a switch (with fuse) or the circuit breaker at the input side of each
welding power source.
If a leakage circuit breaker (ground fault circuit breaker) is used, select one that is protected
from high frequency.
Capacity of commercial input power and amperage of fuse or circuit breaker
CPDP-350
CPDP-500
input power voltage and phase
208
230V, 3-phase
Input voltage range
187
229V
207
253V
Input power (KVA)
More than 24kVA
More than 29kVA
Amperage of fuse or circuit breaker
80A
100A
+: DAIHEN recommends the amperage value of fuse or circuit breaker written above.
However, the value that is prescribed by safety regulations in user’s own country and
district takes priority.
6.2 Precautions for use on an engine generator
CAUTION
Observe the following to prevent problems with the welding machine when using the
auxiliary power supply on an engine generator or engine welder.
Set the voltage of the engine generator to208
218V in no-load running.
If output voltage is set too high, the welding machine may fail.
The engine generator’s voltage response is slower than the commercial input power when
the engine generator’s load suddenly changes. Therefore, the output voltage drops
excessively when the load current varies suddenly due to arc start, and that may cause a loss
of arc. However, the welding machine will not be out of order due to such conditions. To
prevent loosing the arc, the engine generator’s capacity must be more than twice the rated
input power (KVA) of the welding machine.
An engine generator with a damper winding is highly recommended. Contact the engine
generator’s manufacturer whether a damper winding is provided or not.
Don’t use more than two welding machines with one engine generator. Loosing the arc may
occur by interference of the other welding machine.
When using an engine welder’s auxiliary power supply, use only the power supply with an
approved voltage waveform. (Contact an engine welder’s manufacturer for details.)
