Parameter Group
-311-
This parameter defines whether the AC drive runs continuously upon instantaneous power failure.
When instantaneous power failure occurs, the AC drive keeps the motor in the power generating state
to keep the bus voltage at a value around the "voltage threshold for enabling power dip ride-
through". This prevents the AC drive from stopping due to undervoltage.
0: Disabled
The power dip ride-through function is disabled.
1: Keep bus voltage constant
When power failure occurs, the bus voltage stays at a value around the "voltage threshold for
enabling power dip ride-through". In this mode, when the line voltage recovers, the AC drive
accelerates to the target frequency based on the acceleration time.
2: Decelerate to stop
When power failure occurs, the AC drive decelerates to stop. In this mode, when the line voltage
recovers, the AC drive decelerates to 0 Hz and stops. The AC drive will start again only when a new
startup command is received.
"Keep bus voltage constant" is recommended for large-inertia applications such as fans, water
pumps, and centrifuges. "Decelerate to stop" is recommended for the textile industry.
F9-64
Threshold for recovering from power dip ride-through
Address:
63808
Min.:
8.0
Unit:
%
Max.: 10.0 Data type: UInt16
Default:
8.5
Change:
At once
Value Range:
8.0% to 10.0%
Description
This parameter defines the voltage threshold for recovering from power dip ride-through. 100%
corresponds to 540 V. This value is slightly lower than the bus voltage before power failure.
Upon power failure, the bus voltage is maintained at about F9-66 (threshold for enabling power dip
ride-through). When the power supply recovers, the bus voltage rises from F9-66 (threshold for
enabling power dip ride-through) to F9-64 (threshold for recovering from power dip ride-through).
During this period, the output frequency of the AC drive keeps decreasing until the bus voltage
reaches F9-64 (threshold for recovering from power dip ride-through).
F9-65
Duration for judging voltage recovery from power dip
Address:
63809
Min.:
0.0
Unit:
s
Max.: 100.0 Data type: UInt16
Default:
0.5
Change:
At once
Value Range:
0.0s to 100.0s
Description
This parameter defines the time required for the bus voltage to rise from F9-64 (threshold for
recovering from power dip ride-through) to the voltage before power failure.
F9-66
Threshold for enabling power dip ride-through
Address:
63810
Min.:
60
Unit:
%
Max.: 100 Data type: UInt16
Default:
80
Change:
At once
To Next Page
Loading...
