Mitsubishi Electric FR-E800, Инструкция по эксплуатации

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15. (A) Application Parameters
15.8 Automatic restart after instantaneous power failure / flying start with a PM motor
15.8
Automatic restart after instantaneous power failure
/ flying start with a PM motor
The inverter can be restarted without stopping the motor operation.
When the automatic restart after instantaneous power failure function is selected, the motor driving is resumed in the following
situations:
• When power comes back ON during inverter driving after an instantaneous power failure
• When the motor is coasting at start

Selection of restart operation (Pr.162)
• At a power restoration, the encoder detects the motor speed by a frequency search so that the inverter can re-start
smoothly.
• The encoder also detects the rotation direction so that the inverter can re-start smoothly even during the reverse rotation.
• When "10 (or 11)" is set in
Pr.162 , a restart operation is performed at each start and automatic restart after instantaneous
power failure. When "0 (or 1)" is set in Pr.162 , a restart operation is performed at the first start after a power-ON, and from
the second power-ON onwards, a start from the starting frequency is performed.
NOTE
• Because a DC injection brake is applied instantaneously at speed detection during a restart, the speed might drop if the
moment of inertia (J) of the load is small.
• Restart operation with reduced voltage is not available for PM sensorless vector control.
• A protective function may be activated for some motor models or at certain running speeds, disabling restarting.
 Restart coasting time (Pr.57)
• Coasting time is the time from the motor speed detection to the restart operation start.
• To enable restart operation, set "0" (no coasting time) in
Pr.57 Restart coasting time . Generally, this setting does not
interfere with inverter operation.
PM PM PM
Pr. Name Initial value Setting range Description
57
A702
Restart coasting time 9999
0 No delay
0.1 to 30 s
Set the delay time for the inverter to perform a restart after restoring
power due to an instantaneous power failure.
9999 No restart
162
A700
Automatic restart after
instantaneous power
failure selection
0
0, 1 Frequency search only performed at the first start
10, 11 Frequency search at every start
611
F003 Acceleration time at a
restart
9999
0 to 3600 s
Set the acceleration time to reach Pr.20 Acceleration/deceleration
reference frequency at restart.
9999
Standard acceleration time (for example, Pr.7 ) is applied as the
acceleration time at restart.
Instantaneous (power failure) time
Power supply
(R/L1,S/L2,T/L3)
Motor
speed N (r/min)
Inverter output
frequency f (Hz)
Inverter output
voltage E (V)
Coasting
time (
Pr.57 )
Speed
detection
time
+
Acceleration time
at a restart
(
Pr.611 setting)
*
The output shut off timing differs
according to the load condition
*