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Page 7.7 - 10 COMBIVERT F5-A, -E, -H © KEB, 2012-10

Speed control

7.7.4.1 Precontrolreciprocalofamplication/ltering

For some applications it is not necessary to pre-control the complete acceleration torque (cS.28 = 100%) see

the following reasons:

- a different torque is required with the same acceleration at motoring or generating (e.g. due to friction)

- the speed setpoint setting (e.g. by external control) is made in steps, so torque jumps can occur

- the (analog) speed setpoint setting is superimposed by a noise, which must be damped for the pre-

control

The inuence of the pre-control can be damped with parameter cS.28 „pretorq. speed fact. %" for these appli-

cations

Torque peaks, which are caused by a speed setpoint setting in steps, can be reduced by means of a low

pass lter. Here also valid: the higher the time in parameter cS.27 „pretorq. speed PT1 time“ the better the

smoothing, the undynamic but also the precontrol.

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KEB COMBIVERT F5-H Specifications

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