What is code G on motor?

Indicating locked rotor code letters for electrical motors

NEMA Code Letter	KVA/HP with locked rotor	Approximate Mid-Range Value
G	5.6-6.29	5.9
H	6.3-7.09	6.7
J	7.1-7.99	7.5
K	8.0-8.99	8.5

What does kVA code mean?

A letter code defines the locked rotor current kVA on a per horsepower basis. The letter code consists of letters from A to V. The farther away from the letter code A, the higher the inrush current per horsepower.

How is kVA code calculated?

Here is the tabulation of those code letters and kVA per horsepower values….Locked rotor KVA per Horsepower.

Letter designation	(KVA/HP) Minimum	(KVA/HP) Maximum
A	1	3.14
B	3.15	3.54
C	3.55	3.99
D	4	4.49

What does 1ph mean on a motor?

A single-phase supply connected to an alternating current electric motor does not produce a rotating magnetic field; single-phase motors need additional circuits for starting (capacitor start motor), and such motors are uncommon above 10 kW in rating.

How do I know if my rotor is locked?

Out in the field, the rule of thumb for locked-rotor current is six times the full-load amperes marked on the motor’s nameplate. The result of multiplying the full-load amperes of a motor by six might be close to the actual locked-rotor current or the result might not be anywhere near the actual locked-rotor current.

Is 12615 a standard motor?

This standard specifies the performance requirements and efficiency of three phase squirrel cage energy efficient induction motors. This standard was first published in 1989 and revised in 2004 to include two types of energy efficiency values.

What is NEMA standard for motors?

NEMA is the North American standard for electric motors. NEMA is the publisher of NEMA MG 1-2014, a book that defines the manufacturing standards for alternating-current (AC) and direct-current (DC) motors in North America. The IEC is the standard for electric motors for the rest of the world.

What Locked current?

Locked rotor current is basically the current drawn by the motor at its rated voltage when its rotor is kept stationary or in other words rotor is not spinning or rotating. As the rotor is at rest during starting and voltage is rated voltage, the starting current will be equal to locked rotor current.

How do you calculate kVA lock rotor?

To find LRA and starting kVA enter nominal operation voltage (such as 120 or 240), HP value, code letter from the nameplate label, and hit “Calculate” button. The general equation for single-phase devices is the following: LRA=1000*(kVA/HP)/Voltage. Note that this defines starting current at full nominal voltage.

What causes locked rotor?

*The locked rotor amps will vary based on the compressor size & incoming voltage. *If a compressor with starting components is only drawing 7 amps on the start winding, there is a good chance the start components have failed.