Danfoss vlt aqua Programming Guide

2.19. Main Menu - Application Functions - Group 22
This group contains parameters used for monitoring water/ wastewater 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.
2.19.1. 22-2* No-Flow Detection
The VLT AQUA 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 (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 VLT AQUA Drive 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
VLT
®
AQUA Drive Programming Guide 2. Parameter Description
MG.20.O2.02 - VLT
®
is a registered Danfoss trademark 195
2

Danfoss vlt aqua Specifications

General

Brand	Danfoss
Model	vlt aqua
Category	DC Drives
Language	English