ABB ACS880-07LC, Hardware Manual

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Implementing the power loss ride-through function
If the incoming supply voltage is cut off, the drive will continue to operate by utilizing the
kinetic energy of the rotating motor. The drive will be fully operational as long as the motor
rotates and generates energy to the drive.
The main contactor or breaker of the drive opens in a power loss situation. When the power
returns, the main contactor or breaker closes. However, if the power loss lasts so long that
the drive trips on undervoltage, a fault reset and a fresh start command is required to continue
operation. These are also required if the auxiliary power buffer module (C22, if present)
runs out during the break.
Implement the power-loss ride-through function as follows:
1. Enable the power-loss ride-through function of the drive (parameter 30.31 ).
2. If the installation is equipped with a main contactor, prevent its tripping at the input
power break. For example, use a time delay relay (hold) in the contactor control circuit.
3. Enable the automatic restart of the motor after a short power supply break:
• Set the start mode to automatic (parameter 21.01 or 21.19 , depending on the motor
control mode being used).
• Define the automatic restart time (parameter 21.18 ).
WARNING!
Make sure that a flying restart of the motor will not cause any danger. If you are
in doubt, do not implement the power loss ride-through function.
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”.
Bypass connection is available as a factory-installed option for some cabinet-installed drive
types. Consult ABB for more information.
WARNING!
Never connect the drive output to the electrical power network. The connection
may damage the drive.
Supplying power for the auxiliary circuits
Depending on selected drive options, the customer/installer may have to provide the auxiliary
voltage from an external supply to the drive. For details, see the circuit diagrams delivered
with the drive.
The user must supply these options from external power sources:
• +G300/+G301: Cabinet heaters and/or lighting (230 or 115 V AC; external fuse: 16 A gG)
• +G307: Connection for an external uninterruptible power supply (230 or 115 V AC;
external fuse 16 A gG)
• +G313: Power supply connection for a motor space heater output (230 V AC; external
fuse 16 A gG).
78 Guidelines for planning the electrical installation