Implementing The Undervoltage Control (Power-Loss Ride-Through); Using A Contactor Between The Drive And The Motor; Implementing A Bypass Connection - ABB ACS560 Hardware Manual

78 Planning the electrical installation
Implementing the undervoltage control (power-loss
ride-through)
See ACS560 standard control program firmware manual (3AXD50000044997
[English].

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
If you 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.
If you 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/UL 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.
Implementing a bypass connection.