Step 9: Remove The Front Cover From The Drive; Step 10: Disconnect The Power Wiring - ABB ACH400 Series Retrofit Manual

Step 9: Remove the front cover from the drive.

 Insert a screwdriver into the slot and release the retaining lever.
Then swing the cover away from the drive and remove it.
 Use an appropriate meter to verify the absence of AC line voltage
at the drive terminals (U1, V1,W1) and measure the DC voltage at
terminals (Uc+, Uc-) before servicing the unit..

Step 10: Disconnect the Power Wiring.

If wiring is not clearly marked (as shown in the picture at the

right), use tags to identify each wire for later reconnection to the
proper terminals.
 Disconnect ac input leads at terminals U1, V1 and W1. The pic-
ture to the right shows the R1 Frame terminal block. The loca-
tion and layout of power terminals for R2, R3 and R4 frames are
similar.
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