Ach 400 Drive Inputs And Outputs - ABB ACH 400 User Manual

Chapter 2 – Overview of ACH 400 with Electronic Bypass
Relay Contact Outputs
ACH 400 Drive
Inputs and Outputs
2-8
The Run Enable input is connected to the series combination of any external
normally closed interlock contacts that must be closed to allow the motor to
run. If any of these external contacts are open, the Enable LED is not
illuminated , the drive output and the bypass contactor are deenergized, and
the motor is prevented from running.
The Mode input can be connected to an external contact that is closed to select
the Bypass mode. If the Mode input contact is closed, the bypass switches to
the Bypass mode and does not respond to the Drive and Bypass keys. When
the Mode input contact is switched from closed to open, the bypass switches
to the Drive mode but can be controlled using the Drive and Bypass keys.
The Electronic Bypass provides four form C relay contacts for external use.
The Inverter Fault relay is energized if the ACH 400 is energized and
deenergized if the ACH 400 is deenergized or if a fault has occurred.
The Inverter Run relay is energized when the ACH 400 is running. The N.O.
contact of this relay is connected in parallel with the N.O. contact of the
Bypass Run relay to provide an output that is closed when the motor is
running whether powered by the ACH 400 drive or the bypass. The Inverter
Run contacts can be disconnected form the Bypass Run contacts and used
separately by cutting jumpers R63 and R64 on the bypass control board. See
Electronic Bypass Jumper, Switch and Pot Settings in Chapter 4 on page 4-2.
The Bypass Run relay is energized when the motor is running on bypass
power. The N.O. contact of this relay is connected in parallel with the N.O.
contact of the Inverter Run relay to provide an output that is closed when the
motor is running whether powered by the ACH 400 drive or the bypass. The
Bypass Run contacts can be disconnected from the Inverter Run contacts and
used separately by cutting jumpers R63 and R64 on the bypass control board.
See Electronic Bypass Jumper, Switch and Pot Settings in Chapter 4 on page
4-2.
The Bypass Fault relay is energized when the bypass is energized and not
faulted. The Bypass Fault relay is deenergized when the bypass is
deenergized, faulted or the bypass motor overload protection has tripped.
Some of the ACH 400 inputs and outputs are pre-wired to the bypass control
board and not available for external use. The inputs and outputs that are not
pre-wired are available for external use by connecting directly to the terminals
in the ACH 400. The pre-wired and available inputs and outputs are described
below. Refer to the ACH 400 User's Manual for additional information about
the inputs and outputs. See also Chapter 3 – Installation Instructions for
additional information and connection instructions.
The ACH 400 has two relay outputs that are pre-wired to the bypass control
board and used to provide the Inverter Run and Inverter Fault outputs that are
described above.
Two of the ACH 400's digital inputs, the Auto Mode Start/Stop input and the
Enable input are also pre-wired to the bypass control board and coordinated
with the Start/Stop and Run Enable inputs that control the motor in both the
Drive and Bypass modes of operation.
ACH 400 with Electronic Bypass User's Manual