Miller Electric Bobcat 250 Owner's Manual page 56

13-8. Power Required To Start Motor
Motor Start G
Code
KVA/HP 6.3
13-9. How Much Power Can Generator Supply?
OM-4419 Page 52
Single-Phase Induction Motor Starting Requirements
H J
7.1 8.0
4
AC MOTOR
1
VOLTS 230 AMPS
3
CODE M Hz
HP 1/4 PHASE
1
2
K L M
9.0 10.0 11.2
2
2.5
60
1
N P
12.5 14.0
1 Motor Start Code
2 Running Amperage
3 Motor HP
4 Motor Voltage
To find starting amperage:
Step 1: Find code and use table to
find kVA/HP. If code is not listed,
multiply running amperage by six to
find starting amperage.
Step 2: Find Motor HP and Volts.
Step 3: Determine starting amper-
age (see example).
Welding generator amperage out-
put must be at least twice the
motor's running amperage.
(kVA/HP x HP x 1000) / Volts =
Starting Amperage
Example: Calculate starting amper-
age required for a 230 V, 1/4 HP mo-
tor with a motor start code of M.
Volts = 230, HP = 1/4, kVA/HP =
11.2
(11.2 x 1/4 x 1000) / 230 = 12.2A
Starting the motor requires 12.2
amperes.
S-0624
1 Limit Load To 90% Of
Generator Output
Always start non-resistive (motor)
loads in order from largest to small-
est, and add resistive loads last.
2 5 Second Rule
If motor does not start within 5
seconds, turn off power to prevent
motor damage. Motor requires
more power than generator can
supply.
Ref. ST-800 396-A / S-0625