Phoenix Contact CSS 1.5-1/3-EMC Handleiding (152 Pagina's)

Handleiding

Description of parameter settings

109908_en_02 Phoenix Contact 79 / 150

10.5 Rotary switch in “OPTIONS” position

The following information is relevant for sections 10.5.1, 10.5.2, 10.5.5, 10.5.6 and

10.5.7.

The CONTACTRON Speed Starter controls the motor voltage and frequency in a constant

ratio on the output side. This control function is designated as U/f operation. Frequency

and voltage are kept proportional to each other up to the rated frequency and voltage of

the motor. This is necessary due to the inductive behavior of the motor and leads to a con-

stant torque over wide ranges without overloading the motor in terms of current. To adapt

the rated voltage and the rated frequency of the motor, change the values in

10.5.1 “Motor rated frequency” and 10.5.2 “Motor rated voltage”. The default value is

50 Hz and 230 V (single-phase devices)/400 V (3-phase devices).

At very low speeds, this operating mode results in lower torque due to the ohmic resis-

tance of the winding. To increase the torque, adapt the parameters 10.5.6 “Start boost”

and 10.5.7 “Voltage lift”.

In U/f operation, the speed of the connected motor might vary depending on its load.

10.5.1 Motor rated frequency

Set the rated frequency for the motor as indicated on the motor’s rating plate.

Can be set during operation Clear text display Parameter name Setting range Default setting

- 1. rF - motor rated

frequency

Motor rated frequency 0.0 Hz ... 500.0 Hz 50.0 Hz

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