Danfoss VLT HVAC Drive FC 102, Руководство по программированию, Страница: 161 / 250

3.20 Parameters: 22-** Application
Functions
This group contains parameters used for monitoring HVAC
applications.
22-00 External Interlock Delay
Range: Function:
0 s
*
[0 - 600
s] Only relevant if 1 of the digital inputs in
parameter group
5-1* Digital Inputs has been
programmed for [7] External Interlock . The
external interlock timer introduces a delay after
the signal has been removed from the digital
22-00 External Interlock Delay
Range: Function:
input programmed for external interlock, before
reaction takes place.
22-01 Power Filter Time
Range: Function:
0.50 s
*
[0.02 - 10 s] Sets the time constant for the filtered
power readout. A higher value gives a
more steady readout but a slower system
response to changes.
3.20.1 22-2* No-Flow Detection
Detection
timer
Low speed
detected
Low Power
detected
Warning
Alarm
External
sleep mode
command
Min run
timer
Min sleep
timer
Sleep
mode
Cascade
controller
(destaging
command)
speed detection
Sleep mode
Off
No flow/low
130BA252.15
1
P 22-22
P 22-24
1
P 22-40
P 22-41
P 22-21
P 25-26
P 22-23
Illustration 3.50 No Flow Detection
The frequency converter includes functions for detecting if the load conditions in the system allow the motor to be
stopped:
•
Low power detection.
•
Low speed detection.
One of these 2 signals must be active for a set time ( parameter 22-24 No-Flow Delay ) before selected action takes place.
Possible actions to select ( parameter 22-23 No-Flow Function ):
•
No action
•
Warning
•
Alarm
•
Sleep Mode
Parameter Descriptions Programming Guide
MG11CE02 Danfoss A/S © 03/2015 All rights reserved. 159
3 3