Leeson SCR Thyristor Motor Control Manual de usuario descargar pdf (Pagina 59)

53

Troubleshooting

SPEEDMASTER™ OPERATION MANUAL

Symptom Possible

Causes

Suggested

Solutions

Motor pulsates or

surges under load

On non-reversing

drives, motor runs in

the opposite direction

Motor will not stop

when the speed adjust

potentiometer or

reference signal is set

to zero speed.

1. IR COMP is set too high.

2. Control is in current

limit mode.

1. Motor armature leads

are reversed.

1. MIN SPD trimpot is not

adjusted properly.

1. Adjust the IR COMP

setting slightly CCW

until the motor speed

stabilizes (page 38).

2. Check that motor is of

sufficient horsepower

and amperage.

1. Reverse connections to

the motor armature.

1. Slowly rotate the MIN

SPD trimpot until the

motor stops.

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