ABB ACH 400 User Manual

Also see for ACH400 Series: Retrofit Guide

ABB ACH 400 User Manual Manual pdf 44 page image

Chapter 4 – Start-up ProcedureACH 400 with Electronic Bypass User’s Manual 4-59. Press the HAND key on the ACH 400 keypad. Note that the bottom lineof the display indicates “HAND” and “RUN” and a Right Arrow. TheDrive Run LED on the Bypass keypad should be illuminated.10. Press the UP arrow. Note that the reference frequency indication in thetop line of the display increases from “0.0 Hz.” The large actual outputfrequency indication in the center line of the display should also increasefrom “0.0 Hz.”11. In the top line of the display, the output current indication shouldindicate “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 thedrive before you attempt to service the drive. Bus capacitors in theintermediate DC circuit must discharge before servicing the drive. Check forzero volts at Terminals U C + and U C-. Meter must be rated for 1000 VDC.If the drive does not operate according to these steps, refer to the ACH 400User’s Manual.Motor Connected to theElectronic BypassAfter successfully testing the drive with the motor disconnected, continuetesting 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 thebypass is in the Bypass mode and in either Hand or Auto, the motor will startacross the line as soon as power is applied. If the Enable input contact isclosed 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 toprevent the motor from starting, the bypass should be in the Drive mode andthe drive should be OFF when the power is disconnected at the end of theprevious 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 boardterminal X2:1 before applying power. Set the bypass to Drive mode and thedrive to OFF.3. Apply power to the Electronic Bypass unit.4. Press the Hand key on the ACH 400 control panel.