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Easy Start Guide
Mitsubishi D700-SC Series Inverter
8. How to enable Sensorless Vector mode
The standard motor control mode of the D700
SC Inverter is VxF. This simple mode controls
motor speed by varying Volts and Frequency in
a specific ratio to maintain output torque.
The D700 SC can also operate in Sensorless
Vector mode. This can improve motor
performance without requiring a separate
feedback device. Sensorless Vector mode
operates in the same way as VxF but performs
a number of calculations to improve low speed
torque.
8.1 Parameters to change to enable sensorless vector control
Parameter Description
Pr. 71
Applied motor
Pr. 80
Motor capacity (kW)
Pr. 82
Motor excitation current
Pr. 96
Auto tuning setting/status
Pr. 90
Motor constant (R1)
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These calculations require an "auto tuning" run
during which the Inverter operates for approx.
10s to gather the necessary data. The shaft
does not turn.
To enable sensorless vector control first set the
parameter values specified in 8.1 and then
perform the auto tuning run described in 8.2
and 8.3.
The motor shaft does not turn during auto
tuning.
How to set
Default is 0. Set to
3
for "Standard motor".
Default is 9999 (not set). Set to the motor rated power. eg.
Default is 9999 (not set). Set to approx 30% of motor full load current.
Default is 0. Set to
11
for general purpose magnetic flux vector control.
Default is 9999 (not set). Do not change - this value will be set automatically by auto tuning.
8.2 Enable monitoring and start auto tuning.
Once the parameters in 8.1 have been set, check that the
operation mode is set to "PU". If not, use the "PU/EXT"
key to cycle through operation modes.
The display will show 11 to indicate that the Inverter is
ready for tuning. Press "RUN" to begin tuning.
The display will show 12 whilst tuning is in progress.
Note: If "Er. 4" is displayed ensure that the operation
mode is set to PU (see above) then press RUN again.
8.3 Auto tuning is complete.
The tuning process will take approx. 10 seconds during
which excitation noise will be heard from the motor.
When the process is complete, the display will show 13 to
indicate normal completion and the "RUN" indicator will
flash. Press "STOP" to complete.
If the display shows 9 auto tuning completed with errors.
©
The Inverter
0.75
kW
Page 8
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