Mitsubishi Electric FR-A800 Series Instruction Manual page 634

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 s 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, Pr.162 is set to "3, 13, 1003, or 1013" (reduced impact restart).
 Restart operation with encoder detection frequency search (Pr.162 = "2,
12, 1002, or 1012")
• When "2, 12, 1002, or 1012" 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.
• By encoder detection frequency search, the Pr.299 Rotation direction detection selection at restarting setting are
invalid.
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
• When "2, 12, 1002, or 1012" are set in Pr.162 when encoder feedback control is invalid, the automatic restart is with a
frequency search (Pr.162 = "0, 10, 1000, or 1010").
• In 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
 Restart at every start (Pr.162 ="10 to 13, or 1010 to 1013")
• When "10 to 13, or 1010 to 1013" is set in Pr.162, a restart operation is performed at each start and automatic restart after
instantaneous power failure (after the time period set in Pr.57 elapsed). When "0 (initial value) to 3, or 1000 to 1003" 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.
 Automatic restart operation of the MRS (X10) signal
• The restart operation after restoration from output shutoff by the MRS (X10) signal is as shown in the following table
according to the Pr.30 setting.
2, 10, 11, 102, 110, 111
Other than the above
NOTE
• When output is shut off using safety stop function (terminals S1 and S2), the inverter restarts in the same way as when output
is shut off by the MRS (X10) signal.
 Adjustment of restart coasting time (Pr.57)
• Restart coasting time is the time period from the occurrence of instantaneous power failure until the operation is restarted
after power is restored.
With frequency search, the motor speed is detected and operation is restarted after the coasting time.
Downloaded from ManualsNet.com
Instantaneous (power failure) time
∗
Acceleration time
at a restart (Pr.611)
Restart cushion time (Pr.58)
Pr.30 setting
search engine
page 736.
Operation after restoration from output shutoff by the MRS (X10) signal
Restart operation (starting from the coasting speed)
Starting from Pr.13 Starting frequency.
5. PARAMETERS
5.14 (A) Application parameters
1
2
3
4
5
6
7
8
9
10
633