User manual

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HOW TO CHECK POWER COMPONENTS
8 - TROUBLESHOOTING & MAINTENANCE
8.7 How to check Power Components
Before checking the power components, be sure to disconnect AC Input Supply and wait until the Main Electrolytic
Capacitor (B+ - B-) discharges.
Figure 36: S4 Drive
Diode Module Check •
DB (Dynamic Braking) IGBT •
IGBT Module Check •
z NOTE: If the drive has been powered-off for more than two years, it is strongly recommended that the drive be sent
back to the factory to recondition the electrolytic capacitors.
Check Module Resistance to be Good
R, S and T to B+ 50K ohms or more
R, S and T to B- 50K ohms or more
Check Module Resistance to be Good
DB to B+ See table on page 39
DB to B- 50K ohms or more
Check Module Resistance to be Good
U, V and W to B+ 50K ohms or more
U, V and W to B- 50K ohms or more