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Operation selection at power failure and instantaneous power failure
Restart operation at every start
When Pr. 162 = "10 or 11", automatic restart operation is also performed every start, in addition to the automatic restart
after instantaneous power failure. When Pr. 162 = "0", automatic restart operation is performed at the first start after power
supply ON, but not performed at the second time or later.
Automatic restart operation selection of MRS (X10) signal (When Pr. 162 = "0, 1")
Restart operation after turning MRS (X10) signal ON then OFF using Pr. 30 can be selected as in the table below. When
automatic restart after instantaneous power failure is selected while using the high power factor converter (FR-HC2),
normally set "2" in Pr. 30.
Pr. 30 Setting
Operation after MRS and X10 Signal Turns OFF, ON, then OFF.
0, 1
Start at the Pr. 13 Starting frequency.
2
Restart operation (Starts at the coasting speed)
(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 and 15K..... 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 125 during General-purpose magnetic flux vector control.)
Before performing offline auto tuning
Check the following points before performing offline auto tuning.
The inverter is under V/F control
General-purpose motors (three-phase motors) are connected. The motors are in stop status when the tuning starts.
The motor capacity should be equal to or one rank lower than the inverter capacity.
A high-slip motor, high-speed motor and special motor cannot be tuned. (Do not tune an IPM motor.)
The maximum frequency is 120Hz.
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.
Voltage
100%
Pr. 58
Time
4
163
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