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12-8. Power Required To Start Motor
Motor Start
G
Code
KVA/HP
6.3
12-9. How Much Power Can Generator Supply?
Single-Phase Induction Motor Starting Requirements
H
J
K
7.1
8.0
9.0
4
AC MOTOR
1
VOLTS
230
AMPS
3
CODE
M
Hz
HP
1/4
PHASE
1
2
L
M
10.0
11.2
1
2
3
4
2
To find starting amperage:
2.5
Step 1: Find code and use table to
60
find kVA/HP. If code is not listed,
1
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 =
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.
1
Always start non-resistive (motor)
loads in order from largest to small-
est, and add resistive loads last.
2
If motor does not start within 5
seconds, turn off power to prevent
motor damage. Motor requires
more power than generator can
supply.
N
P
12.5
14.0
Motor Start Code
Running Amperage
Motor HP
Motor Voltage
Starting Amperage
S-0624
Limit Load To 90% Of
Generator Output
5 Second Rule
Ref. ST-800 396-A / S-0625
OM-250 200 Page 41
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