Main Menu - Appl. Functions - Group - Danfoss VLT FC 100 Series Programming Manual

Parameter Description

3.20 Main Menu - Appl. Functions - Group 22

This group contains parameters used for monitoring VLT
HVAC Drive applications.
22-00 External Interlock Delay
Range: Function:
0 s [0 - 600 Only relevant if one of the digital inputs in
*
s] parameter group 5-1* has been programmed for
External Interlock [7]. The external interlock timer
will introduce a delay after the signal has been
3.20.1 22-2* No-Flow Detection
Figure 3.49
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 (22-24 No-Flow Delay) before selected action takes place. Possible
actions to select (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 1-00 Configuration Mode.
Configuration mode for
- Integrated PI Controller: Closed-Loop
- External PI Controller: Open-Loop
®
VLT HVAC Drive Programming Guide
®
22-00 External Interlock Delay
Range:
22-01 Power Filter Time
Range:
0.50 s
MG11CD22 - VLT ® is a registered Danfoss trademark
Function:
removed from the digital input programmed for
External Interlock, before a reaction takes place.
Function:
[0.02 - 10.00 Sets the time constant for the filtered
*
s] power readout. A higher value will give
a more steady readout but a slower
system response to changes.
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