Mitsubishi Electric FR-E800 Series Instruction Manual page 406

 Restart operation without frequency search (Pr.162 = "1 or 11")
• When Pr.162 = "1 or 11" while the encoder feedback control is disabled, reduced voltage start is used for the restart
operation. In this method, the voltage is raised gradually while keeping the output frequency level at the level before an
instantaneous power failure, regardless of the motor's coasting speed.
V/F control, Advanced magnetic flux vector control
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 setting
* The output shut off timing differs according to the load condition.
NOTE
• This restart method uses the output frequency that was active before the instantaneous power failure stored in memory. If the
instantaneous power failure time is 0.2 second or more, the output frequency can no longer be stored and held in memory, so
the restart is performed from Pr.13 Starting frequency (initial value: 0.5 Hz).
• During Real sensorless vector control, the operation is the same as one when Pr.162 = "0 or 10".
 Restart operation with encoder detection frequency search (Pr.162 = "1
or 11")
• When "1 or 11" is set in Pr.162 by encoder feedback control, the inverter is restarted by the motor speed and direction of
rotation that were detected by the encoder at the power restoration.
• The Pr.299 Rotation direction detection selection at restarting setting is invalid by encoder detection frequency
search.
V/F control, Advanced magnetic flux vector control
Instantaneous (power failure) time
Power supply
(R/L1, S/L2, T/L3)
Motor speed N
(r/min)
Inverter output
frequency f(Hz)
Output voltage E(V)
Coasting
time (Pr.57)
The output shut off timing differs according to the load condition.
NOTE
• Under Vector control, encoder detection frequency search is used regardless of the Pr.162 setting. The Pr.58 and Pr.299
settings are invalid at this time.
• For the encoder feedback control, refer to
• During Real sensorless vector control, the operation is the same as one when Pr.162 = "0 or 10".
Restart cushion time
(Pr.58 setting)
Acceleration time
at a restart (Pr.611)
Restart cushion time (Pr.58)
page 450.
15.7 Automatic restart after instantaneous power failure / flying start with an induction motor
15. (A) Application Parameters
11
12
13
14
15
16
17
18
19
20
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