Motor Control; V/F Control With Linear Characteristics - Siemens SINAMICS G110D Operating Instructions Manual

Functions

6.7 Motor control

Rounding does not affect the ramp-down time in the event of a quick stop (OFF3).
Table 6- 28
Parameter
P1130 = ...
P1131 = ...
P1132 = ...
P1133 = ...
P1134 = ...
For more information about this function, see the List Manual (function diagram 5300 and the
parameter list).
6.7 Motor control
6.7.1

V/f control with linear characteristics

Table 6- 29
Parameter
P0003 = 2
P1300 = 0
Optimizing the starting characteristics for a high break loose torque and brief overload
The inverter can provide a higher voltage in the lower speed range and when accelerating.
Examples of applications where this is necessary, include:
● Utilizing the brief overload capability of the motor when accelerating
● Driven machines with a high breakaway torque
● Holding a load
Background information: The linear characteristic of the V/f control assumes an ideal motor
without resistive losses. The resistive losses in the motor stator resistance and in the motor
cable reduce the available torque and must not be neglected in all applications. These
losses play a more significant role the smaller the motor and the lower the motor speed. The
losses can be compensated by the V/f control by increasing the voltage at low speeds. (so-
called 'boost parameters': P1310 and P1311)
Note
Only increase the voltage boost in small steps until satisfactory motor behavior is reached.
Excessively high values in P1310 and P1311 can cause the motor to overhead and switch
off (trip) the inverter due to overcurrent .
102
Rounding parameters
Description
Initial rounding time for ramp up (in seconds)
Final rounding time for ramp up (in seconds)
Initial rounding time for ramp down (in seconds)
Final rounding time for ramp down (in seconds)
Rounding type
Setting the control type
Description
Extended access
Control type: V/f control with linear characteristic
Operating Instructions, 2009-05-15, A5E02385577A AB
SINAMICS G110D