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

Handleiding

Description of parameter settings

109908_en_02 Phoenix Contact 83 / 150

10.5.5 U/f characteristic curve

Use this parameter to select either a linear U/f characteristic curve or a square

U/f characteristic curve.

When a variable loading torque is applied to the asynchronous motor, the loading torque

is low at low speed. Decrease the input voltage to reduce the magnetic field of the input

current and reduce the flux loss and iron loss to increase efficiency.

If you select the square U/f characteristic curve, it has a lower output torque when the

motor runs in the low speed region. Therefore, rapid acceleration and deceleration is not

recommended.

10.5.6 Start boost

When a heavy load is applied to the asynchronous motor, a large portion of output voltage

is dropped on the stator-winding resistor with an insufficient air gap magnetic field, which

results in excessive output current and insufficient output torque.

In the U/f control application, the output voltage is proportional to the output frequency.

In other words, the output voltage is small when the asynchronous motor runs in the low

speed range. The torque compensation aims to compensate the output torque by

increasing the output voltage.

Use this parameter to generate higher output torque. However, when this parameter is

set too large, it may cause over-fluxing of the motor, generation of large output current,

and overheating.

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

 5. vF - vF wave form U/f characteristic curve LIn: Linear

Sqr: Square

LIn

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

 6. bo - start boost Start boost 0.0% ... 10.0% 2.5%

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