Bypass Control Board Inputs And Outputs - ABB ACH 400 User Manual

Chapter 2 – Overview of ACH 400 with Electronic Bypass
Auto mode
In the Auto mode the bypass start/stop command comes from the input
terminals on the bypass control board. The Auto mode is selected by pressing
the Auto key on the bypass keypad. The Auto LED is illuminated green when
the bypass is in the Auto mode. If the bypass is in the Bypass mode, the motor
will start across the line if the Auto mode is selected, the Auto Start and
Enable contacts are closed and any bypass fault is reset.
Off Mode
If the motor is running in the Bypass mode, the operator can manually stop the
motor by pressing the OFF key. The Hand or Auto LED will go out. The
motor can be restarted by pressing the Hand key or the bypass can be returned
to the Auto mode by pressing the Auto key. If the bypass is in the Drive mode,
pressing the OFF key will take the bypass out of the Auto mode, but the motor
will not stop. If the bypass is switched to the Bypass mode, the motor will
stop.
Bypass/Drive
If the ACH 400 is in the Auto mode and the motor is running in the Drive
mode transfers
mode, the motor will transfer to bypass operation if the bypass is switched to
the Bypass mode and the bypass is in the Auto mode.
If the motor is running in the Bypass mode, the motor will transfer to drive
operation if the bypass is switched to the Drive mode and the drive is in the
Auto mode with the Auto Start contact closed.
Starting the Motor on If the Enable Input contacts are closed and the bypass is in the Bypass mode
Application of Power
and in either the Hand or Auto mode, the motor will start across the line as
soon as power is applied. If 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.
Automatic Transfer option
When the Automatic Transfer option is selected, the motor is automatically
transferred to line power if the drive trips out on a protective trip. If automatic
restart has been enabled in the drive, the drive will attempt to automatically
restart before the motor is transferred to line power. The Automatic Bypass
option is selected by setting a configuration switch on the bypass control
board. See Electronic Bypass Jumper, Switch and Pot Settings in Chapter 4 on
page 4-2. The Automatic Transfer LED is illuminated green when the
Automatic Bypass option is selected.
User Override mode In the unlikely event of failure in the bypass control electronics, the user can
put the motor in the Drive mode using a configuration jumper on the bypass
control board. See Electronic Bypass Jumper, Switch and Pot Settings in
Chapter 4 on page 4-2.
Bypass Control Board
Electronic Bypass control board has three inputs and four outputs that are
Inputs and Outputs
available for connection to external control circuits. The input and output
functions are described below. Refer to Chapter 3 – Installation Instructions
for additional information and connection instructions.
Relay Contact Inputs
The Start/Stop input is connected to a normally open contact that starts and
stops the motor. When the Electronic Bypass is in the Drive mode and the
ACH 400 is in the Auto mode, the Start/Stop input contact controls the motor
by starting and stopping the ACH 400 drive. When the Electronic Bypass is in
the Bypass mode and the Auto LED is illuminated green, the Start/Stop input
contact controls the motor by controlling the bypass contactor.
ACH 400 with Electronic Bypass User's Manual 2-7