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PARAMETERS
5
Operation selection at power failure and instantaneous power failure
(2) 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 ...1s
2.2K to 7.5K .....2s
11K or higher....3s
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.
(3) Restart cushion time (Pr. 58)
Cushion time is the length of time taken to raise the voltage appropriate to detected motor speed (output frequency prior to
instantaneous power failure when Pr. 162 = "1, 11") from 0V.
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.
(4) Automatic restart operation adjustment (Pr. 165, Pr. 611)
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.
(5) Frequency search gain (Pr. 298), offline auto tuning (Pr. 96)
When automatic restart after instantaneous power failure operation (with frequency search) is valid at V/F control, perform
offline auto tuning.
Perform offline auto tuning during V/F control in the following order to set Pr. 298 Frequency search gain automatically.
(Refer to page 127 during Advanced magnetic flux vector control and General-purpose magnetic flux vector control.)
zBefore performing offline auto tuning
Check the following before performing offline auto tuning.
The inverter is under V/F control
A motor should be connected. Note that the motor should be at a stop at a tuning start.
The motor capacity should be equal to or one rank lower than the inverter capacity. (note that the capacity is 0.1kW or
more)
A high-slip motor, high-speed motor and special motor cannot be tuned. (The maximum frequency is 120Hz.)
Even if tuning is performed without motor running (Pr. 96 Auto tuning setting/status = "21"), the motor may run slightly.
Therefore, fix the motor securely with a mechanical brake, or before tuning, make sure that there will be no problem in
safety if the motor runs (caution is required especially in vertical lift applications). Note that tuning performance is
unaffected even if the motor runs slightly.
Offline auto tuning will not be performed properly if it is performed with a surge voltage suppression filter (FR-ASF-H, FR-
BMF-H) connected between the inverter and motor. Remove it before starting tuning.
REMARKS
If the Pr. 21 Acceleration/deceleration time increments is changed, the setting increments of Pr. 611 remain unchanged.
Voltage
100%
Pr. 58
Time