3.17 Main Menu - Application Functions - Group 22
This group contains parameters used for monitoring VLT
Refrigeration
Drive applications.
22-00 External Interlock Delay
Range: Function:
0 s* [0 - 600
s]
Only relevant if one of the digital inputs in
parameter
group 5-1* has been programmed for
[7] External Interlock. The External Interlock Timer
will introduce a delay after the signal has been
22-00 External Interlock Delay
Range: Function:
removed from the digital input programmed for
External
Interlock, before reaction takes place.
3.17.1 22-2* No-Flow Detection
Detection
timer
Low speed
detected
Low Power
detected
Warning
Alarm
External
sleep mode
command
Min run
timer
Min sleep
timer
Sleep
mode
Cascade
controller
(destaging
command)
speed detection
Sleep mode
O
No ow/low
130BA252.15
1
P 22-22
P 22-24
1
P 22-40
P 22-41
P 22-21
P 25-26
P 22-23
Illustration 3.43
The VLT Refrigeration Drive FC 103 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
VLT Refrigeration Drive FC 103 or an external PI controller.
Actual configuration must be programmed in 1-00 Configu-
ration Mode.
Configuration mode for
- Integrated PI Controller: Closed Loop
- External PI Controller: Open Loop
CAUTION
Carry out No Flow tuning before setting the PI controller
parameters!
Illustration 3.44
Parameter Description
VLT
®
Refrigeration Drive Programming Guide
128 MG16H102 - VLT
®
is a registered Danfoss trademark
33
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