Technical information

– INTRODUCTION – – INFRANOR V ariable–Speed Drive –
21/04/95
01T00357
18
Page
* LOUD NOISE AND CRACKLING EVEN WHEN OFF
– Shielding fault on resolver wires.
– Motor ground connection fault.
– Ground link fault on logic 0V potential.
* IRREGULAR BUZZING SOUND
– Same causes as above.
– Shielding fault on set point link.
* MOTOR DRIFT ON LOAD IN ONE DIRECTION
– Incorrect logic 0V potential reference.
* IRREGULAR OPERATION, ESPECIALLY AT HIGH SPEED
– Resolver impedance too low.
– Resolver interface faulty.
– Speed dynamic adjustment fault.
– Resolver wiring fault.
*
LOUD NOISE IN THE MOT OR WHEN RUNNING A T HIGH SPEED IN ONE
DIRECTION
– Resolver wiring fault.
*
THE V ARIABLE–SPEED DRIVE CUTS OUT AFTER AN ACCELERA TION
OR BRAKING WITH OVERVOLTAGE
–
Dischar ge on a resistor inef fective (threshold setting fault or fuse blown
on discharge system) – Fault no. 6 displayed on the variable–speed
drive.
* MOTOR WHISTLES AFTER HIGH ACCELERATION AND NOMINAL
SPEED NOT REACHED
– DC voltage too low during accelerations.
* WHISTLING WHEN OFF
– The resolver used has an unsuitable turns ratio.