ABB ACH550-UH HVAC User Manual

ACH550 Installation, Operation and Maintenance Manual 63
ACH550 E-Clipse Bypass
Motor Run LED
The Motor Run LED is illuminated green when the motor is running in either bypass
mode or in drive mode. The Motor Run LED flashes green to indicate the system has
been placed in an Override condition.
Bypass Faulted LED
The Bypass Faulted LED is illuminated or flashes red when the motor or bypass
protection functions have shut down the bypass. The specific nature of the fault is
indicated on the bypass control display. Refer to the Diagnostics section of this
manual for more details.
Drive Selected LED
The Drive Selected LED is illuminated green when the drive has been selected as
the power source for the motor and no drive fault is present.
Bypass Selected LED
The Bypass Selected LED is illuminated or flashes green when the bypass has been
selected as the power source for the motor and no bypass fault is present.
Drive Faulted LED
The Drive Faulted LED is illuminated red when the bypass has lost its
communications link with the drive or when the motor or drive protection functions
have shut down the drive. The specific nature of the fault is indicated on the drive
control panel display. Refer to the Diagnostics section on page 66 of the
ACH550-UH User’s Manual for more details.
Automatic Transfer
The Automatic Transfer indication is provided on the bypass control panel. The
bypass control display will continuously flash an alarm to indicate the system has
automatically transferred to Bypass after a Drive fault. The Bypass Selected LED
flashes green when the system has automatically transferred to bypass operation.
The bypass event log will also record this event.
Auto Indication
The Auto Indication is provided on the bypass control panel default display when the
bypass control panel Auto key is pressed. Normally this indicates that the Auto Start
contact or serial communications has been selected as the means for starting and
stopping the motor in the bypass mode.
Off Indication
The Off Indication is provided on the bypass control panel default display when
bypass control panel Off key is pressed.
Hand Indication
The Hand Indication is provided on the bypass control panel default display when
the motor has been started manually in the bypass mode.
Drive Select Key
The Drive Select Key selects the drive as the power source for the motor.

ABB ACH550-UH HVAC Specifications

General

Brand	ABB
Model	ACH550-UH HVAC
Category	Controller
Language	English