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 Timer
Range: Function:
0
*
[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 reaction takes place.
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 (No Flow Delay par. 22-24) before selected action takes place. Possible actions to select (par.
22-23): 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 frequency converter or an external PI controller. 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!
VLT
®
HVAC Drive Programming Guide 3. Parameter Description
MG.11.C5.02 - VLT
®
is a registered Danfoss trademark
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