ABB ACH550-UH User Manual page 373

ACH550 E-Clipse Bypass User's Manual 2-27
If the ACH550 Drive and E-Clipse Bypass operate according to these steps, and you
have familiarized yourself with their operation, disconnect and lock out power to
prepare for the next test.
WARNING! Wait at least five minutes after disconnecting power from the drive
before you attempt to service the drive. Bus capacitors in the intermediate DC circuit
must discharge before servicing the drive. Using a meter rated for 1000 VDC, check
for zero volts at:
• Terminals BRK+ to GND and BRK- to GND (frame size R1/R2)
• Terminals UC+ and UC- (frame size R3...R8).
If the drive does not operate according to these steps, refer to the ACH550-UH
User's Manual.
Installation