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SIMPLE ELECTRIC SYMBOLS OR PROGRAMING SYMBOLS

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

How to cheak DIODE ??????

MANY TIMES WE ARE SO CONFUSED ABOUT DIODE ....

HOW TO TEST A DIODE IN REAL OR PRESENT CERCUIT BORD .

IT'S VERY SIMPLE ,

WHEN DIODE IS NOT CONNECTED   IN ANY CIRCUIT BORD IT'S SHOWS REAL VALUE 

BUT, WHEN DIODE IS CONNECT IN ANY CIRCUIT BORD IT'S ADD SOME RESISTANCE OR CAPACITANCE WITH IT AND WE MADE WRONG DECISION .

SO WHEN DIODE IS FREE  CHECK WITH MULTI METER .   

PUT MULTI METER IN DIODE MODE AND POSITIVE PROBE IN POSITIVE (ANODE ) TERMINAL OR NEGATIVE PROB IN NEGATIVE (CATHODE) TERMINAL . 

IT'S  GIVE VALUE APROX 0.3  TO 0.8 .

AND REVERSE POLARITY MULTI METER SHOWS OL .

WHEN DIODE SHOWS DIFFERENT VALUE OR CONTINUITY  DIODE IS BROKEN.

WHEN DIODE IS CONNECTED ON CIRCUIT BORD  , PULL OUT ONE OF THEM TERMINAL AND CHECK THE VALUE . 

WHEN IT'S SHOWS DIFFERENT THAT MEAN YOUR DIODE IS BROKEN .

AND ITS SHOWS CORRECT VALUE THAT MEAN YOUR DIODE IS OK.

                                                                                                                  AKASH AGHARA

                                                                                                                  TIRUPATI AUTOMATION