Mitsubishi Electric 800 Series Instruction Manual page 521

(A) Application parameters
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.
• To enable restart operation, set "0" to Pr.57 Restart coasting time. If "0" is set to Pr.57, the coasting time is automatically
set to the following value (Unit: s). Generally, this setting does not interfere with inverter operation.
Pr.570 Pr.162
setting setting
00027
Other
0.5
0 (SLD)
than 3, 13
1 (LD)
3, 13 1
Other
0.5
than 3, 13
2 (ND)
3, 13 1
Other
0.5
than 3, 13
3 (HD)
3, 13 1
Interruption > Pr.57 setting
Power supply
(R/L1、S/L2、T/L3)
Inverter output
frequency f (Hz)
• Inverter operation is sometimes hindered by the size of the moment of inertia (J) of the load, output frequency, or the
residual magnetic flux in the motor. Adjust this coasting time within the range 0.1 to 30 seconds to match the load
specification.
NOTE
• Note that the coasting time setting is different from that of the FR-A700 series inverter. (Refer to
Restart cushion time (Pr.58)
• The cushion time is the time taken to raise the voltage to the level required for the specified speed after the motor speed
detection (output frequency before instantaneous power failure when Pr.162 = "1 or 11").
• Normally, the motor runs at the initial value as it is. However, adjust to suit the moment of inertia (J) of the load or the size
of the torque.
• Pr.58 is invalid under Real sensorless vector control or vector control.
520
PARAMETERS
00061 00090
1 1
2 2
1 1
2 2
0.5 1
1 2
Instantaneous power failure
(interruption) time
Coasting time
Pr.57 setting
FR-A860-[]
00170 00320 00450
3 3 3
3 3 3
1 3 3
2 3 3
1 3 3
2 3 3
Interruption ≤ Pr.57 setting
Power supply
(R/L1、S/L2、T/L3)
Inverter output
frequency f (Hz)
Coasting time
Pr.57 setting
00680 01080 01440
3 5 5
3 5 5
3 3 5
3 3 5
3 3 3
3 3 3
Instantaneous power failure
(interruption) time
page 682.)
01670 or
higher
5
5
5
5
5
5