3.20 Main Menu - Application Functions - FC 100 - Group 22
This group contains parameters used for monitoring VLT HVAC Drive applications.
22-00 External Interlock Delay
Range: Function:
0 s* [0 - 600 s] Only relevant if one of the digital inputs in par. 5-1* has been programmed for
External 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 a reaction takes place.
3.20.1 22-2* No-Flow Detection
The adjustable frequency drive 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 Delay
) before selected action takes place. Possible actions to select (par.
22-23
No-Flow Function
): No action, Warning, Alarm, Sleep Mode.
No Flow Detection:
This function is used for detecting a no flow situation in pump systems where all valves can be closed. Can be used both when controlled by the integrated
PI controller in the adjustable frequency drive or an external PI controller. The actual configuration must be programmed in par.1-00
Configuration
Mode
.
Configuration mode for
- Integrated PI Controller: Closed-loop
- External PI Controller: Open-loop
Carry out No Flow tuning before setting the PI controller parameters!
3 Parameter Description VLT
®
HVAC Drive Programming Guide
3-196
MG.11.C6.22 - VLT
®
is a registered Danfoss trademark
3
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