OM-286504 Page 57
11-8. Power Required To Start Motor
OM-4419 Page 1
VOLTS AMPS
HP
230 2.5
1/4
Hz
PHASE
CODE 60
1
M
AC MOTOR
1
2
3
4
1 Motor Start Code
2 Running Amperage
3 Motor HP
4 Motor Voltage
Step 1: Find code and use table to find kVA/
HP. If code is not listed, multiply running am-
perage by six to find starting amperage.
Step 2: Find Motor HP and Volts.
Step 3: Determine starting amperage (see
example).
Welder/generator amperage output must be
at least twice the motor’s running amperage.
(kVA/HP x HP x 1000) / Volts = Starting
Amperage
Example: Calculate starting amperage re-
quired for a 230 V, 1/4 HP motor 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.
Single-Phase Induction Motor Starting Requirements
Motor Start
Code
G H J K L M N P
KVA/HP 6.3 7.1 8.0 9.0 10.0 11.2 12.5 14.0
11-9. How Much Power Can Generator Supply?
1 Limit Load To 90% Of Generator Output
Always start non-resistive (motor) loads in
order from largest to smallest, and add resis-
tive 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.
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