ABB ACH400 Series User Manual

ABB HVAC Drives
ACH400 Vertical Electronic Bypass to ACH550 E-Bypass,
1 - 25Hp @ 208V, 1 - 50Hp @ 480V (R1 ... R4 Frame Size Drives)
Retrot Guide
PRODUCTS

ABB ACH400 Series Specifications

General

Brand	ABB
Model	ACH400 Series
Category	Controller
Language	English

Summary

ACH400 to ACH550 Drive Replacement Instructions

Step 1: Verify correct replacement drive

Confirm chosen replacement drive and verify catalog numbers.

Steps 2-4: Record settings, deactivate system, and remove power

Record ACH400 parameters, deactivate system, and lockout power.

Step 5: Remove bypass unit cover

Loosen and remove screws to detach the bypass unit cover.

Steps 6-8: Verify voltages, board version, and control panel

Verify voltages, check board version, and remove drive's control panel.

Steps 9-10: Remove drive cover and disconnect power wiring

Remove drive front cover and disconnect power wiring.

Steps 11-12: Disconnect control wiring

Disconnect customer and factory installed control wiring from ACH400.

Step 13: Remove ACH400 drive

Loosen mounting screws and physically remove ACH400 drive.

Steps 14-16: Clean, prepare, and mount ACH550

Clean area, prepare, and mount the new ACH550 drive.

Steps 17-18: Reinstall power and control wiring

Reinstall power wiring and new control cable to ACH550.

Steps 19-20: Reinstall customer wires and covers

Reconnect customer control wires and reinstall ACH550 covers and panel.

Step 21: Reinstall option mounting bracket

Reinstall metal option mounting bracket if it was removed.

Step 22: Reinstall bypass unit cover

Apply gasket and reinstall bypass unit cover, aligning disconnect handle.

Steps 23-25: Power up, verify, and program ACH550

Reapply power, verify status, and program new drive via Start-Up Assistant.

Steps 26-27: Test unit and complete replacement

Test system operation and confirm drive replacement completion.