Inovance MD800 Series - Page 524

Function Applications
-523-
Related Parameters
Parame
ter No.
Parameter Name
Default
Value
Setting Range Parameter Description
F9-63
Power dip ride-through
function selection
0
0: Disabled
1: Decelerate
2: Decelerate to
stop
The function enables the AC drive to run
continuously at occurrence of instantaneous
power loss. When an instantaneous power
loss occurs, the AC drive keeps the motor in
the power generation state to keep the bus
voltage at a value around the "Threshold of
power dip ride-through function enabled",
preventing the AC drive from stopping due
to undervoltage.
0: Disabled
The power dip ride-through function is
disabled.
1: Bus voltage constant control
When a power loss occurs, the bus voltage is
retained at a value around the "Threshold of
power dip ride-through function enabled".
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 a power loss 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. "Bus voltage constant
control" is applicable to large-inertia
applications such as fan, water pump and
centrifuge. "Decelerate to stop" is applicable
to the textile industry.
F9-64
Threshold of power dip
ride-through function
disabled
8.5% 8.0% to 10.0%
Used to set the threshold of power dip ride-
through function disabled for the AC drive.
100% corresponds to 540 V. This value is
slightly lower than the bus voltage before
power loss.
Upon power loss, the bus voltage is
maintained at about F9-66 (Threshold of
power dip ride-through function enabled).
When the power supply recovers, the bus
voltage rises from F9-66 (Threshold of power
dip ride-through function enabled) to F9-64
(Threshold of power dip ride-through
function disabled). During this period, the
output frequency of the AC drive keeps
decreasing until the bus voltage reaches
F9-64 (Threshold of power dip ride-through
function disabled).
F9-65
Judging time of bus
voltage recovering from
power dip
0.5s 0.0 to 100.0s
Used to set the time required for the bus
voltage to rise from F9-64 (Threshold of
power dip ride-through function disabled) to
the voltage before power loss.