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.
Planning the electrical installation 61
Summary of Contents for ACQ80-04 Series
Page 1: ...ABB DRIVES FOR WATER ACQ80 04 drives 0 75 to 160 kW 1 0 to 215 hp Hardware manual...
Page 2: ......
Page 4: ......
Page 18: ...18...
Page 24: ...24...
Page 38: ...38...
Page 50: ...50...
Page 64: ...64...
Page 98: ...98...
Page 110: ...110...
Page 140: ...Frame R3 IP20 140 Dimension drawings...
Page 146: ...146...
Page 162: ...162...
Page 168: ......