N3 Drive Operations Manual
Control Mode Selection 27
18.0 Control Mode Selection
The N3 inverter series has three control modes:
1. General Vector Control.
2. VT (Variable torque) Vector Control (Special for Fans and Pumps).
3. V/f Control (Factory default).
The user can select one of these control modes by following the flow chart below and setting the parameters as
shown. When vector control is selected the motor HP must match the inverter rating.
Control Mode
Variable Torque
A000=1
Vector Control
Parameters to be Set:
A001 Motor rated voltage
A002 Motor rated current
A003 Motor HP
A004 Motor rated speed
A005 Motor rated frequency
A007 AC line input voltage
Perform auto tuning : A006=1
Parameters that can be Set:
B009 V/f Pattern
A129 Torque boost
A130 Motor no load current
A131 Motor rated slip
A132 Max. output frequency
A133 Max. output voltage
A134 Medium output frequency
A135 Medium output voltage
A136 Min. output frequency
A137 Min. output voltage
Suitable motor current A002
(OL1 reference)
General Vector
A000=0
V/f Control
A000=2
(Factory Default)
END
Select Control Mode
The V/f control mode should be used when the following conditions apply.
(1) Using one inverter to drive several motors simultaneously.
· In this case the rated inverter output current must equal or exceed the sum total of all of the motors
connected.
· The correct V/f pattern must be set by parameters A132 – A137.
(2) The motors’ nameplate information is unknown or the motor ratings are not standard.
· In this case the inverter will set the motor characteristics in accordance with a standard TECO motor.
(3) The specifications of the inverter and motor differ by more than 1 HP.
In V/f control, A001 - A005 max. & min. values are determined by the TECO standard motor specification limit.
When parameter A000 = 2 (V/f control), the keypad will display ‘Err2’ if Auto tuning is performed.
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