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Operation selection at power failure
and instantaneous power failure
4
PARAMETERS
(4) Restart coasting time (Pr. 57)
⋅ Coasting time is the time from when the motor speed is detected until automatic restart control is started.
⋅ Set Pr. 57 to "0" to perform automatic restart operation. The coasting time is automatically set to the value below.
Generally this setting will pose no problems.
1.5K or lower . . . . . 0.5s, 2.2K to 7.5K. . . . . . 1s, 11K to 55K . . . . . . . . . 3.0s, 75K or higher. . . . . 5.0s
⋅ Operation may not be performed well depending on the magnitude of the moment of inertia (J) of the load or
running frequency. Adjust the coasting time between 0.1s and 5s according to the load specifications.
(5) Restart cushion time (Pr. 58)
⋅ Cushion time is the length of time taken to raise the voltage appropriate to the detected motor speed (output
frequency prior to instantaneous power failure when Pr. 162 = "1" or "11").
⋅ Normally the initial value need not be changed for operation, but adjust it according to the magnitude of the
moment of inertia (J) of the load or torque.
⋅ Pr. 58 is invalid during Real sensorless vector control or vector control.
(6) Automatic restart operation adjustment (Pr. 163 to
Pr. 165, Pr. 611)
⋅ Using Pr. 163 and Pr. 164, you can adjust the voltage rise time at
a restart as shown on the left.
⋅ Using Pr. 165, you can set the stall prevention operation level at
a restart.
⋅ Using Pr. 611, you can set the acceleration time until Pr. 20
Acceleration/deceleration reference frequency is reached when
automatic restart operation is performed besides the normal
acceleration time.
CAUTION
⋅
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.
⋅ When automatic restart operation is selected, undervoltage protection (E.UVT) and instantaneous power failure protection
(E.IPF) among the fault output signals will not be provided at occurrence of an instantaneous power failure.
⋅ The SU and FU signals are not output during a restart. They are output after the restart cushion time has elapsed.
⋅ Automatic restart operation will also be performed after a reset made by an inverter reset is canceled or when a retry is made
by the retry function.
⋅ Automatic restart after instantaneous power failure function is invalid when load torque high speed frequency control (Pr. 270 =
"2, 3 or 13") is set.
CAUTION
Provide mechanical interlocks for MC1 and MC2. The inverter will be damaged if the power supply is input to the
inverter output section.
When automatic restart after instantaneous power failure has been selected, the motor and machine will start
suddenly (after the reset time has elapsed) after occurrence of an instantaneous power failure. Stay away from
the motor and machine. When you have selected automatic restart after instantaneous power failure function,
apply in easily visible places the CAUTION stickers supplied to the instruction manual (basic).
♦ Parameters referred to ♦
Pr. 7 Acceleration time, Pr. 21 Acceleration/deceleration time increments Refer to page 172
Pr. 13 Starting frequency Refer to page 175
Pr. 65, Pr. 67 to Pr. 69 Retry function Refer to page 273
Pr. 78 Reverse rotation prevention selection Refer to page 308
Pr. 178 to Pr. 189 (input terminal function selection) Refer to page 231
Voltage
100%
Pr.164
(Pr.163) Pr.58
Time
REMARKS
⋅ If the setting of Pr. 21 Acceleration/deceleration time increments is
changed, the setting increments of Pr. 611 does not change.