Optidrive VTC – User Guide
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15
5.7.
Motor Autotuning
Optidrive VTC uses a sophisticated Voltage Vector control method as a factory default setting to ensure best possible motor operation. This control
method requires the Optidrive to carry out an autotune to measure certain motor parameters prior to operation, to ensure this function operates
correctly, and reduce the risk of nuisance tripping.
Whilst the autotune procedure does not rotate the motor shaft, during the autotune procedure, the motor shaft may still turn. It
is not normally necessary to uncouple the load from the motor, however the user should ensure any that no risk arises from the
possible movement of the motor shaft.
Autotune after Factory Reset
Following a factory reset (See section 6.1.3), the correct data from the motor nameplate should be entered in P1-07, P1-08 and P1-09. Providing
that P1-08 is adjusted from the factory default setting, the Optidrive will automatically carry out an autotune on the motor the first time it is
enabled. During the autotune, the display will show
. The test procedure may take several minutes to complete depending on the motor.
Once the autotune is completed, the drive will operate as normal, and no further autotuning will be required unless the motor or drive control
mode is changed (P4-01).
User Selected Autotune
The user can program the drive to carry an autotune if required, as follows:-
Ensure the motor nameplate values are correctly entered in P1-07 (Motor Rated Voltage), P1-08 (Motor Rated Current) and P1-09 (Motor Rated
Frequency)
Set P1-14 = 101 to allow access to Parameter Groups 2, 3 and 4
Set P4-02 = 1
The autotune will begin immediately when P4-02 is set to 1, and no external enable signal is required. During the autotune
procedure, the motor shaft may turn. It is not normally necessary to uncouple the load from the motor, however the user should
ensure any that no risk arises from the possible movement of the motor shaft.
5.8.
Operation of Three Phase drives on Single Phase Supplies
Applies to: -
Optidrive VTC, 230 Volt Supply versions, Size 3 and above
Optidrive VTC, 400 Volt Supply versions, Size 2 and above
It is possible to operate the above drive units from a single phase supply of the same rated voltage. When used in this way, the maximum output
current capacity is reduced by 50%. In order to operate on a single phase supply, the supply MUST be connected to the L1 and L2 terminals of the
drive. The user must then press
+
+
for >2s. The display will show
, and all parameters will be reset to factory default
settings. Press the
button to acknowledge and reset the drive. The maximum motor rated current setting in P1-08 will now be limited to 50%
of its original value, and the Phase Loss and Phase Imbalance Protection features will be disabled.
