Danfoss VLT 6000 HVAC

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.