Nidec COMMANDER S100 - Page 76

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76 Commander S100 User Guide
P3.05 Motor Control Mode
Range: 0 to 2 Default: 1 (Linear V to F)
Defines the voltage characteristic applied to the motor
The default mode of linear V to F is suitable for most applications. For fan and pump applications the Square V to F mode can be selected which
matches the characteristic of the load. For applications that require good torque performance the Resistance Compensation mode should be used.
For this mode of operation an auto-tune should be carried out to measure the stator resistance of the motor, or the resistance should be set up
manually. An auto-tune can be carried out with Perform Auto-tune (P3.09).
Figure 7-8 Output Voltage Characteristic (Linear V to F)
For Linear V to F, the voltage to frequency characteristic can be adjusted at two points, 0 Hz where the starting boost voltage is set in Motor
Starting Boost (P3.06), and Motor Starting Boost End Frequency (P3.08), Motor Starting Boost End Voltage (P3.07) which is the frequency and
voltage point at which the boost level is tapered to.
From the second adjustable point the voltage rises linearly towards the Motor Rated Voltage (P3.03) at Motor Rated Frequency (P3.15).
Above Motor Rated Frequency (P3.15), the voltage on the motor is constant and the field strength in the motor reduces as the frequency is
increased.
Figure 7-9 Output Voltage Characteristic (Square V to F with boost)
For Square V to F, only the starting boost is adjustable and the voltage output follows a square law from this point until the voltage reaches Motor
Rated Voltage (P3.03) at Motor Rated Frequency (P3.15). At frequencies above this the motor voltage is constant.
Value Motor Control Mode Description
0
Resistance Compensation A linear frequency to voltage characteristic with stator resistance compensation.
1
Linear V to F A fixed linear frequency to voltage characteristic.
2
Square V to F A fixed square frequency to voltage characteristic.