Main Menu - Application Functions - Group - Danfoss VLT Series Programming Manual

Parameter Description

3.20 Main Menu - Application Functions - Group 22

This group contains parameters used for monitoring VLT
HVAC Drive applications.
22-00 External Interlock Delay
3 3
Range:
0 s [0 - 600
*
s]
3.20.1 22-2* No-Flow Detection
No ow/low
speed detection
Low Power
detected
Low speed
detected
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 (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 frequency converter or an external PI controller. Actual configuration
must be programmed in 1-00 Configuration Mode.
Configuration mode for
- Integrated PI Controller: Closed Loop
- External PI Controller: Open Loop
146
VLT
Function:
Only relevant if one of the digital inputs in
parameter group 5-1* has been programmed for
External Interlock [7]. The External Interlock Timer
will introduce a delay after the signal has been
P 22-21
1
Detection
timer
P 22-22
P 22-24
MG.11.CC.02 - VLT
®
HVAC Drive Programming Guide
®
22-00 External Interlock Delay
Range:
22-01 Power Filter Time
Range:
0.50 s [0.02 - 10.00
*
s]
External
sleep mode
command
O
Warning
Alarm
P 22-23
®
is a registered Danfoss trademark
Function:
removed from the digital input programmed for
External Interlock, before reaction takes place.
Function:
Sets the time constant for the filtered
power readout. A higher value will give
a more steady readout but a slower
system response to changes.
Sleep mode
Sleep
Min run
mode
timer
1
Min sleep
timer
P 22-40
P 22-41
Cascade
controller
(destaging
command)
P 25-26