Main Menu - Application Functions - Group 22; No-Flow Detection - Danfoss VLT Programming Manual

®
VLT HVAC Drive Programming Guide
21-62 Ext. 3 Integral Time
Range:
10000.00 [0.01 - 10000.00 s]
s*
21-63 Ext. 3 Differentation Time
Range:
0.00 s* [0.00 - 10.00 s]
21-64 Ext. 3 Dif. Gain Limit
Range:
5.0 N/A* [1.0 - 50.0 N/A]

3.20 Main Menu - Application Functions - Group 22

This group contains parameters used for monitoring VLT HVAC Drive applications.
22-00 External Interlock Delay
Range:
0 s* [0 - 600 s]
22-01 Power Filter Time
Range:
0.50 s* [0.02 - 10.00 s]

3.20.1 22-2* 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 two signals must be active for a set time (par. 22-24
No-Flow Function
(par. 22-23 ): No action, Warning, Alarm, Sleep Mode.
Function:
Ext. 1 Integral Time
See par. 21-22
Function:
Ext. 1 Differentation Time
See par. 21-23
Function:
See par. 21-24 Ext. 1 Dif. Gain Limit
Function:
Only relevant if one of the digital inputs in parameter group 5-1* has been programmed for
Interlock [7]. The External Interlock Timer will introduce a delay after the signal has been removed
from the digital input programmed for External Interlock, before reaction takes place.
Function:
No-Flow Delay
MG.11.C9.02 - VLT ® is a registered Danfoss trademark
3 Parameter Description
for details.
for details.
for details.
) before selected action takes place. Possible actions to select
3
External
201