ABB ACH 400 User Manual

Chapter 4 – Start-up Procedure
ACH 400 with Electronic Bypass User’s Manual 4-5
9. Press the HAND key on the ACH 400 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 ACH 400 Drive and Electronic 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. Check for
zero volts at Terminals UC+ and UC-. Meter must be rated for 1000 VDC.
If the drive does not operate according to these steps, refer to the ACH 400
User’s Manual.
Motor Connected to the
Electronic Bypass
After successfully testing the drive with the motor disconnected, continue
testing the drive as follows:
1. Disconnect and lock out power to the Electronic Bypass unit.
2. Connect the motor to the output terminals.
Caution: If the Auto Start and Enable input contacts are closed and the
bypass is in the Bypass mode and in either Hand or Auto, the motor will start
across the line as soon as power is applied. If the Enable input contact is
closed and the bypass is in the Drive mode with the drive in the Auto mode,
the motor will start on the drive as soon as power is applied. In order to
prevent the motor from starting, the bypass should be in the Drive mode and
the drive should be OFF when the power is disconnected at the end of the
previous series of tests with the motor disconnected.
In order to prevent the motor from starting without disconnecting the motor,
open the Enable contact or disconnect the wire on bypass control board
terminal X2:1 before applying power. Set the bypass to Drive mode and the
drive to OFF.
3. Apply power to the Electronic Bypass unit.
4. Press the Hand key on the ACH 400 control panel.

ABB ACH 400 Specifications

General

Brand	ABB
Model	ACH 400
Category	Controller
Language	English