NB!
If the drive is equipped with a constant speed bypass with an automatic bypass function that starts the bypass if the drive experiences
a persistent alarm condition, be sure to disable the bypass’s automatic bypass function, if [2] Alarm or [3] Man. Reset Alarm is selected
as the End of Curve Function.
22-51 End of Curve Delay
Range: Function:
10 s* [0 - 600 s] When an End of Curve condition is detected, a timer is activated. When the time set in this parameter
expires, and the End of Curve condition has been steady in the entire period, the function set in
par. 22-50
End of Curve Function
will be activated. If the condition disappears before the timer
expires, the timer will be reset.
3.20.5 22-6* Broken Belt Detection
The Broken Belt Detection can be used in both closed and open loop systems for pumps, fans and compressors. If the estimated motor torque is below
the broken belt torque value (par. 22-61
Broken Belt Torque
) and the frequency converter output frequency is above or equal to 15 Hz, the broken belt
function (par. 22-60
Broken Belt Function
) is performed
22-60 Broken Belt Function
Selects the action to be performed if the Broken Belt condition is detected
Option: Function:
[0] * Off
[1] Warning The drive will continue to run, but activate a Broken Belt Warning [W95]. A drive digital output or
a serial communication bus can communicate a warning to other equipment.
[2] Trip The drive will stop running and activate a Broken Belt alarm [A 95]. A drive digital output or a serial
communication bus can communicate an alarm to other equipment.
NB!
Do not set par. 14-20
Reset Mode
, to [13] Infinite auto reset, when par. 22-60
Broken Belt Function
is set to [2] Trip. Doing so will
cause the drive to continuously cycle between running and stopping when a broken belt condition is detected.
NB!
If the drive is equipped with a constant speed bypass with an automatic bypass function that starts the bypass if the drive experiences
a persistent alarm condition, be sure to disable the bypass’s automatic bypass function, if [2] Trip is selected as the Broken Belt Function.
22-61 Broken Belt Torque
Range: Function:
10 %* [0 - 100 %] Sets the broken belt torque as a percentage of the rated motor torque.
22-62 Broken Belt Delay
Range: Function:
10 s [0 - 600 s] Sets the time for which the Broken Belt conditions must be active before carrying out the action
selected in par. 22-60
Broken Belt Function
.
3.20.6 22-7* Short Cycle Protection
When controlling refrigeration compressors, often there will be a need for limiting the numbers of starts. One way to do this is to ensure a minimum run
time (time between a start and a stop) and a minimum interval between starts.
VLT
®
HVAC Drive Programming Guide 3 Parameter Description
MG.11.C9.02 - VLT
®
is a registered Danfoss trademark
211
3
To Next Page
Loading...
Need help?
General
