HOW TO DEBUG OR REPAIR AC DRIVE

WHEN AC DRIVE IS FAULTY THEN NEED TO REPAIR IT

THERE ARE FEW STEPS YOU NEED TO FOLLOW:

(1)FIRST WE CHECK IGBT

FIRST YOU FIND  INPUT TERMINALS R,S,T , OUTPUT TERMINALS U,V,W 
AND IGBT BRAKING TERMINAL P (+) AND PR (-).

PUT NEGATIVE PROB OF METER IN P(+) TERMINAL AND
POSITIVE PROB TO  R,S,T AND U,V,W TERMINAL . IN METER DISPLAY
SHOWS 0.3 TO 0.7.  DRIVES LOWER IGBT IS OK.

THEN
PUT POSITIVE PROB OF METER IN PR(-) TERMINAL AND
NEGITIVE PROB TO R,S,T AND U,V,W  TERMINAL . IN METER DISPLAY
SHOWS 0.3 TO 0.7 . DRIVES UPPER IGBT IS OK.

(2) CHECK  DC BUS 

 GIVE POWER TO  DRIVE AND CHECK OUTPUT VOLTAGE
PUT POSITIVE PROB TO P(+) TERMINAL AND NEGATIVE PROB TO U,V,W
 METER SHOWS 560 TO 700 V DC. 

THEN
PUT NEGATIVE PROB TO PR(-) TERMINAL AND POSITIVE PROB TO U,V,W
 METER SHOWS 560 TO 700 V DC.

(3)CHECK VISUAL INSPECTION

SHOW IN ELECTRIC BOARD AND VISUALIZE ALL COMPONENT
SHOW WHERE IS COMPONENT DAMAGE OR BERNT.
YOU SEE ANY COMPONENT DAMAGE OR BERNT.
REPLACE THE COMPONENT.

(4)CHECK COMPONENT 

WHEN EVER YOU NOT ABLE TO CHECK COMPONENT YOU NOT NEED TO WORRY YOU JUST COMPARE VALUE OF SAME COMPONENT AND YOU FIND DAMAGE COMPONENT.

                                                                                                                
                                                                                                                  AKASH AGHARA

                                                                                                                  TIRUPATI AUTOMATION