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FR-A701 Series
Instruction Manual Supplement
For the FR-A701 series manufactured in January 2015 or later, the following specifications are added.
Check the year and month of manufacture by the SERIAL number printed on the rating plate of the
inverter.
SERIAL number check
Refer to the inverter manual for the location of the rating plate.
In the following sections, indicates the functions that are driven by PM sensorless vector control.
1 PM sensorless vector control
sIPt
Highly efficient motor control and highly accurate motor speed control can be performed by using the inverter with an
IPM (internal permanent magnet) motor, which is more efficient than an induction motor.
The motor speed is calculated based on the output voltage and current from the inverter. It does not require a speed
detector such as an encoder. The inverter drives the IPM motor with the least required current when a load is applied
in order to achieve the highest motor efficiency.
Rating plate example
5 1
Symbol Year Month Control number
SERIAL
The SERIAL consists of one symbol, two characters indicating production
year and month, and six characters indicating control number.
The last digit of the production year is indicated as the Year, and the Month
is indicated by 1 to 9, X (October), Y (November), or Z (December).
Purpose Parameters to be Set Refer to Page
To perform IPM parameter initialization IPM parameter initialization Pr. 998
4
To select the torque characteristic in a
low-speed range
Low-speed range torque
characteristics
Pr. 788
14
To adjust the gain for PM sensorless
vector control
Adjusting the speed control
gain
Pr. 820, Pr. 821
Chapter 4 of the
Instruction Manual
(Applied)
POINT
The following conditions must be met to perform PM sensorless vector control.
· For the motor model, IPM motor must be used.
· The motor capacity must be equal to or one rank lower than the inverter capacity.
· Single-motor operation (one motor run by one inverter) must be performed.
· The overall wiring length with the motor must be 100m or less. (When the wiring length exceeds 30m,
offline auto tuning must be performed.)
CAUTION
· The speed setting range for an MM-CF IPM motor is between 0 and 200Hz.
· The carrier frequency is limited during PM sensorless vector control. (Refer to page 17)
· Constant-speed operation cannot be performed in the low-speed range of 200r/min or less under current
synchronization operation. (Refer to page 14)
· During PM sensorless vector control, the RUN signal is output about 100ms after turning ON the start command (STF,
STR). The delay is due to the magnetic pole detection.
· During PM sensorless vector control, the automatic restart after instantaneous power failure function operates only
when an MM-CF IPM motor is connected. However, the frequency search may not be available at 2200 r/min or
above. The restart operation cannot be performed until the motor speed drops to a frequency where the frequency
search is available.
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