Mitsubishi Electric FATEC FR-A800 Manual page 83

5
BREAKDOWN MAINTENANCE
(3) Setting the power failure time deceleration-to-stop function (A730 (Pr.261) to A735
(Pr.266), A785 (Pr.294))
Change A730 (Pr.261) (Power failure stop selection) from the initial value "0" to "2" (without UV
avoidance, re-accelerate if power is restored) to restart the motor without E.IPF display.
The power failure time deceleration-to-stop function decelerates and stops the motor to prevent
motor coasting when power failure or undervoltage occurs.
This setting is effective to stop the motor when power failure occurs for safety of the machine
tool.
Parameter
Name
number
A730 Power failure stop
(261) selection
A731 Subtracted frequency at
(262) deceleration start
A732 Subtraction starting
(263) frequency
A733 Power failure
(264) deceleration time 1
A734 Power failure
(265) deceleration time 2
Power failure
A735
deceleration time
(266)
switchover frequency
A785 UV avoidance voltage
(294) gain
5.2 Troubleshooting by the demonstration machine
78
Power supply
Motor speed
Deceleration
stop
Initial value
Setting
range
FM CA
Coasts to stop
0 When undervoltage or a power failure occurs, the inverter output is
shut off.
Without
1 undervoltage
avoidance
With undervoltage
11
avoidance
Without
21 undervoltage
0 avoidance
Without
2 undervoltage
avoidance
With undervoltage
12
avoidance
Without
22 undervoltage
avoidance
Normally, the motor runs at the initial value as it is. However, adjust the
3 Hz 0 to 20 Hz value according to the size of the load specification (moment of inertia
and torque).
When output frequency ≥ A732 (Pr.263)
0 to590 Hz
When output frequency < A732 (Pr.263)
60 Hz 50 Hz
9999 Output frequency - deceleration from A731 (Pr.262)
0 to 3600/ Set the slope applicable from the deceleration start to A735 (Pr.266)
5s
360 s set frequency.
0 to 3600/ Set the slope applicable for the frequency range starting at A735
9999 360 s (Pr.266) and downward.
9999 Same as A733 (Pr.264)
Set the frequency at which the slope during deceleration switches from
60 Hz 50 Hz 0 to590 Hz
the A733 (Pr.264) setting value to the A734 (Pr.265) setting value.
Adjust the response at undervoltage avoidance operation. Setting a
100% 0 to 200%
large value improves the response to changes in the bus voltage.
Power failure
Time
Description
When undervoltage or a power failure occurs, the
inverter can be decelerated to a stop.
When undervoltage or a power failure occurs, the
deceleration time is automatically adjusted for a
deceleration stop.
When undervoltage or a power failure occurs, the
inverter can be decelerated to a stop.
The motor re-accelerates if the power is restored
during the deceleration to stop.
When undervoltage or a power failure occurs, the
deceleration time is automatically adjusted for a
deceleration stop.
The motor re-accelerates if the power is restored
during the deceleration to stop.
Output frequency - deceleration from A731 (Pr.262)
Deceleration from the output frequency