8.19.1.3 Optimizing motor starting
Overview
After selection of the U/f characteristic, no further settings are required in most applications.
In the following circumstances, the motor cannot accelerate to its speed setpoint after it has
been switched on:
• Load moment of inertia too high
• Load torque too large
• Ramp-up time p1120 too short
To improve the starting behavior of the motor, a voltage boost can be set for the U/f characteristic
at low speeds.
Requirement
The ramp-up time of the ramp-function generator is, depending on the motor rated power, 1 s
(< 1 kW) … 10 s (> 10 kW).
Function description
Setting the voltage boost for U/f control
The converter boosts the voltage corresponding to the starting currents p1310 … p1312.
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Figure 8-53 The resulting voltage boost using a linear characteristic as example
Increase parameter values p1310 … p1312 in steps of ≤ 5 %. Excessively high values in p1310 ...
p1312 can cause the motor to overheat and switch o (trip) the converter due to overcurrent.
If message A07409 appears, it is not permissible that you further increase the value of any of the
parameters.
Procedure
1. Switch on the motor with a setpoint of a few revolutions per minute.
2. Check whether the motor rotates smoothly.
Advanced commissioning
8.19 Motor control
Distributed converter for SIMOGEAR geared motors
294 Operating Instructions, 10/2020, FW V4.7 SP13, A5E31298649B AL
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