Using A Contactor Between The Drive And The Motor; Implementing A Bypass Connection; Example Bypass Connection - ABB ACQ80-04 Series Hardware Manual

Using a contactor between the drive and the motor

Implementing the control of the output contactor depends on how you select the drive to
operate. See also section
When you have selected to use vector control mode and motor ramp stop, open the contactor
as follows:
1. Give a stop command to the drive.
2. Wait until the drive decelerates the motor to zero speed.
3. Open the contactor.
When you have selected to use vector control mode and motor coast stop or scalar control
mode, open the contactor as follows:
1. Give a stop command to the drive.
2. Open the contactor.
WARNING!
When the Vector control mode is in use, never open the output contactor while
the drive controls the motor. The vector control operate extremely fast, much faster
than it takes for the contactor to open its contacts. When the contactor starts
opening while the drive controls the motor, the vector control will try to maintain
the load current by immediately increasing the drive output voltage to the maximum.
This will damage the contactor completely.
￭

Implementing a bypass connection

If bypassing is required, employ mechanically or electrically interlocked contactors between
the motor and the drive and between the motor and the power line. Make sure with
interlocking that the contactors cannot be closed simultaneously. The installation must be
clearly marked as defined in IEC/EN 61800-5-1, subclause 6.5.3, for example, "THIS
MACHINE STARTS AUTOMATICALLY".
WARNING!
Never connect the drive output to the electrical power network. The connection
may damage the drive.
￭

Example bypass connection

An example bypass connection is shown below.
(page 61).
Planning the electrical installation 61