6additional open-loop and closed-loop control, 1 chopper frequency – Lenze 8615E User Manual

Page 98

Additional open-loop and closed-loop control

6.1

Chopper frequency

The

of the 8600 series offer the feature to adapt the

chopper frequency of the controller to the noise and smooth
running requirements of the motor. By increasing the chopper
frequency you

generally reduce the motor noises

are

generated by the pulsating output voltage.
By reducing the chopper frequency the smooth running in the low
frequency range is often improved.

CO18 you

select a variable

fixed chopper frequency.

Variable chopper frequency

With a chopper frequency, from 4 to 16 kHz variable, the set

chopper frequency is maintained us long as the switching losses in
the controller

for this. If an overload is recognized, the

chopper frequency is reduced automatically to the extent as it is
necessary to continue Operation. If the motor

is reduced

again, the chopper frequency is increased.

Fixed chopper frequency
When a fixed chopper frequency is set, the chopper frequency is
not reduced in

of overload. A fixed chopper frequency is

useful only when the

of the motor noise is

every operating state if motor noise filters are used. By reducing

the maximum

internally, the overload

is restricted.

Code

Name

CO1

Chopper

frequency

Parameter (Factory setting is printed in bold)

1 kHz (field frequency max. 120 Hz)

(field frequency max. 240 Hz)

v a r i a b l e

variable
v a r i a b l e

-5-

variable

-6-

variable

12kHz fixed (for sine filter)

fixed (for sine filter)

Acceptance

[SH PRG]

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