Mitsubishi Electric 800 Series Instruction Manual page 355

• 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 number of seconds. Generally, this setting does not interfere with inverter operation.
Voltage
class
FR-E820-0080(1.5K) or lower
200 V
FR-E820-0110(2.2K) or higher
FR-E840-0040(1.5K) or lower
400 V
FR-E840-0060(2.2K) or higher
FR-E860-0027(1.5K) or lower
575 V
FR-E860-0040(2.2K) or higher
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.
 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 the 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.
NOTE
• Pr.58 is invalid under Real sensorless vector control.
 Adjustment of restart operation (Pr.165, Pr.611)
• The stall prevention operation level at a restart operation can be set in Pr.165.
• Using Pr.611, the acceleration time to reach Pr.20 Acceleration/deceleration reference frequency after a restart
operation can be set. This can be set individually from the normal acceleration time.
NOTE
• Pr.165 is invalid under Real sensorless vector control.
• Changing the Pr.21 setting does not affect the Pr.611 setting increment.
• Changing the terminal assignment using Pr.178 to Pr.189 (Input terminal function selection) may affect the other functions.
Set parameters after confirming the function of each terminal.
• The SU and FU signals are not output during the restart. These signals are output after the restart cushion time passes.
• Restart operation is also performed after the inverter reset is released or after the retry by the retry function occurs.
CAUTION
• When the automatic restart after instantaneous power failure function is selected, the motor suddenly starts
(after reset time passes) when an instantaneous power failure occurs. Stay away from the motor and machinery.
When the automatic restart after instantaneous power failure function has been selected, apply the CAUTION
sticker(s), which are found in the Inverter Safety Guideline enclosed with the inverter, to easily visible places.
Parameters referred to
Pr.7 Acceleration time, Pr.21 Acceleration/deceleration time
Pr.13 Starting frequencypage
Pr.65, Pr.67 to Pr.69 Retry
354
14. (A) Application Parameters
14.7 Automatic restart after instantaneous power failure / flying start with an induction motor
Inverter
ND
Instantaneous power failure
(interruption) time
Coasting time
Pr.57 setting
169, page 170
functionpage 208
LD
FR-E820-0050(0.75K) or lower
FR-E820-0080(1.5K) or higher
FR-E840-0026(0.75K) or lower
FR-E840-0040(1.5K) or higher
FR-E860-0017(0.75K)
FR-E860-0027(1.5K) or higher
Interruption ≤ Pr.57 setting
Power supply
(R/L1、S/L2、T/L3)
Inverter output
frequency f (Hz)
incrementspage 158
Coasting time (s)
1
2
1
2
0.5
1
Instantaneous power failure
(interruption) time
Coasting time
Pr.57 setting