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HVACR317 – Core for Refrigeration. Motor Application Compressor Motors. HERMETIC COMPRESSORS CANNOT BE SERVICED. HERMETIC COMPRESSOR CROSS SECTION. HERMETIC COMPRESSORS MAY HAVE CURRENT RELAYS FOR MOTOR STARTING. CURRENT RELAYS CLOSE ON HIGH AMPS OPEN ON LOW AMPS. MOTOR STARTS.

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hvacr317 core for refrigeration

HVACR317 – Core for Refrigeration

Motor Application

Compressor Motors

current relays close on high amps open on low amps
CURRENT RELAYS

CLOSE ON HIGH AMPS

OPEN ON LOW AMPS

motor current profile

MOTOR STARTS

MOTOR SPEED INCREASE

MOTOR AT SPEED

AMPS

APPLIED

MOTOR CURRENT PROFILE

motor current profile1

MOTOR STARTS

CURRENT RELAY CUT-OUT

MOTOR AT SPEED

CURRENT RELAY CUT-IN

MOTOR CURRENT PROFILE

once the motor is started the amps level off to fla full load amps

AMPS

Locked

Rotor Amps

(LRA)

Full Load

Amps (FLA)

TIME

Once the motor is started, the amps level off to FLA (Full Load Amps).

100%

CURRENT RELAY CUT-IN

CURRENT RELAY CUT-OUT

100%

0%

0%

AMPS

Speed

hard start kits for hart to start motors
HARD START KITS FOR

HART-TO-START

MOTORS

measuring current with a clamp on ammeter

CURRENT RELAY APPLICATION

POTENTIAL RELAY APPLICATION

MEASURING CURRENT with a CLAMP-ON AMMETER

measuring current with a clamp on ammeter1

CURRENT RELAY APPLICATION

MEASURING CURRENT with a CLAMP-ON AMMETER

measuring resistance with a multimeter
MEASURING RESISTANCE with a MULTIMETER

MOTOR WINDING RESISTANCE

CURRENT RELAY COIL RESISTANCE

resistance measurements across motor windings

LEAD POSITIONS

RESISTANCE MEASUREMENT

R to C

LOW RESISTANCE

S to C

MEDIUM RESISTANCE

R to S

HIGH RESISTANCE

RESISTANCE MEASUREMENTS ACROSS MOTOR WINDINGS