Danfoss VLT 6000 HVAC Manual de Serviço descarregar pdf (Página 120)

VLT

6000 HVAC

120

★ = factory setting. ( ) = display text [ ] = value for use in communication via serial communication port

MG.60.B1.02 - VLT is a registered Danfoss trade mark

427 PID lowpass filter time

(PID FILTER TIME)

Value:

0.01 - 10.00 ★ 0.01

Function:

Oscillations on the feedback signal are dampened by

the lowpass filter in order to reduce their impact on

the process regulation. This can be an advantage e.g.

if there is a lot of noise on the signal.

Used in Closed loop [1] (parameter 100).

Description of choice:

Select the desired time constant (τ). If a time constant

(τ) of 0.1 s is programmed, the break frequency for the

lowpass filter will be 1/0.1 = 10 RAD/sec.,

corresponding to (10/(2 x π)) = 1.6 Hz.

The process regulator will thus

only regulate a feed-

back signal that varies by a frequency lower than 1.6

Hz.

If the feedback signal varies by a higher frequency

than 1.6 Hz, the Process regulator will not react.

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Danfoss VLT 6000 HVAC Manual de Serviço Página 120