Miller Electric ProHeat 35 - Manual (Page 43)

OM-222 166 Page 37
6-9. System Operating Characteristics
The power source delivers a high-frequency alternating current output that energizes the coil creating the magnetic field used to heat the workpiece.
The power source output characteristics are a function of the configuration, type and number of coils used as shown in the following table:
Table 6-1. Power Source Output Characteristics
Output Type Maximum Amperage Maximum Voltage Frequency Range
Air Cooled Single and Dual
250 A per output for 15 minutes.
After 15 minutes, power steps
down to limit current to 150 am-
peres per output for continuous
operation.
700 V 5 − 25.7 kHz
See Note 1 700 V 25.7 − 30 kHz
Single Liquid Cooled
350 A 700 V 5 − 20 kHz
Single Liquid Cooled
See Note 2 700 V 20 − 30 kHz
Dual Liquid Cooled
350 A per output/700 A total 700 V 5 − 20 kHz
Dual Liquid Cooled
See Note 2 700 V 20 − 30 kHz
.
Note 1: In the frequency range
of 25.7 to 30 KHz, the maxi-
mum output amperage de-
creases linearly from 250 down
to 175 amperes per output. Re-
gardless of frequency, after 15
minutes the maximum output is
reduced to 150 amperes per
output.
M
ax
Amperage Per Output
Frequency (KHz)
5 25.7 30
0
50
100
150
200
250
300
Air Cooled Output
.
Note 2: In the frequency range
of 20 to 30 KHz, the maximum
output decreases linearly from
350 down to 175 amperes per
output.
M
ax
Amperage Per Output
Frequency (KHz)
5 20 30
0
50
100
150
200
250
300
350
400
Liquid Cooled Output