ABB ACH550 User Manual page 19

E-Bypass Configurations for ACH550 Drives
very specific application requirements make it necessary to use this type of motor
control. Operation using the "Vector: Speed" setting is unnecessary for control of
almost all fan and pump applications. Refer to the ACH550-UH User's Manual for
details on setting parameters.
8. Press the Drive Select key on the bypass keypad. The Drive Select LED should be
illuminated.
9. Press the HAND key on the ACH550 keypad. Note that the bottom line of the display
indicates "HAND" and "RUN" and a Right Arrow. The Drive Run LED on the Bypass
keypad should be illuminated.
10. Press the UP arrow. Note that the reference frequency indication in the top line of
the display increases from "0.0 Hz." The large actual output frequency indication in
the center line of the display should also increase from "0.0 Hz."
11. In the top line of the display, the output current indication should indicate "0.0 A" and
the torque indication should indicate "0%."
12. Press the DOWN arrow until the frequency indications return to "0.0 Hz."
13. Press the OFF key. Note that the bottom line of the display indicates "Off."
If the ACH550 Drive and E-Bypass operate according to these steps, 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+ and BRK- (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.
Test: Motor Connected to the E-Bypass
After successfully testing the drive with the motor disconnected, continue testing the
drive as follows:
1. Disconnect and lock out power to the E-Bypass unit.
2. Connect the motor to the output terminals.
CAUTION: If the Fireman's Override (Override 1) input contact is closed, the
motor will start across the line as soon as power is applied.
If the Safety Interlock and Run Enable input contacts are closed and the
Bypass Override (Override 2) input contact is closed, the motor will start
across the line as soon as power is applied.
If the Start/Stop, Safety Interlock and Run Enable input contacts are closed
and the system is in the Bypass mode and in either Hand or Auto, the motor
will start across the line as soon as power is applied.
17
Installation