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Installation and user guide
Rev: 4.0
NTT 240/460
Operation mode
6.15.3 Sensorless speed control
This control topology is designed only for applications that require medium-low performance where speed and
position accuracy are not strictly necessary.
Operation conditions:
•
control is available with rotary brushless or asynchronous motor type only.
•
main speed reference can be analog, inside or frequency reference and fieldbus reference available for any
operation mode.
•
auxiliary speed reference for I/O and Modbus RTU operation mode only.
•
about regulation, standard speed/current regulators are available and also sensorless regulators for brushless
and asynchronous motors.
•
brake motor management is not available.
•
trapezoidal ramps are available.
The following image shows an example of setting of a speed control working in Modbus RTU mode, then you can set:
•
the reference type, analog mode in case of Input / Output mode and Modbus RTU mode or internal mode in case
of fieldbus (in the case shown in picture, speed and torque reference are analog).
•
full scale for analog analog inputs.
•
optimal standard and sensorless PID regulators for application.
•
desired digital I/O.
!
In order to obtain a correct operation, please ensure to perform Factors calculation procedure: please see
See
“Ch. 5 Wiring and connections” pag. 26
for more details about connectors:
»
J5-6 connector
: for feedback connection, see:
1.
»
J3 and J7-8-9 connector
:
1. provide the main speed reference in the differential input (pins 1-2 of J9) or the frequency reference (pins
1 to 6 of J7) or fill the target speed table-selection. For details about input reference, please see
2. provide the auxiliary reference for second speed reference (pin 3-4 of J9). For details about input reference,
“6.09.2 Auxiliary references” pag. 88
3. for fieldbus operation modes, connect J3 connector and see related fieldbus manuals for information about all
control topology parameters.
4. connect the appropriate input and output signals (please see
).
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