72 FP5/GP5User’s Manual
Chapter 3 - Programming Features
FP5/GP5 Operation
Torque Adjustment (n071, Torq Comp Gain)
Motor torque can be adjusted by changing the V/f pattern (n010) or by
adjusting the torque compensation gain (n071). For details on setting the
V/f pattern, see “V/f Pattern Adjustment”, on page 75.
·Full-range Automatic Torque Boost
The motor torque requirement changes according to load conditions.
Full-range automatic torque boost adjusts the output motor voltage
according to the required torque. The FP5/GP5 automatically
adjusts the voltage during constant-speed operation as well as during
acceleration.
The required torque is calculated by the inverter. The optimum motor
voltage will be output to ensure tripless operation and power savings.
Output voltage ∝ Torque compensation gain × Required torque
Normally, no adjustment is necessary for torque compensation gain
(n071, factory default: “1.0”). When the wiring distance between the
inverter and the motor is long, or when the motor generates vibration,
change the torque compensation gain.
Increasing torque compensation gain increases motor torque, but an
excessive increase may cause the following:
·Inverter trips due to motor overexcitation
·Motor overheat or excessive vibration
If adjustment is necessary, adjust in 0.1 increments.
Required torque ⇒ Increase voltage
Frequency
Voltage
Figure 43 Torque Characteristics
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