Broken Belt Detection - Danfoss VLT HVAC Basic Drive FC 100 Series Programming Manual

Parameters
22-47 Sleep Speed [Hz]
Range: Function:
0 [ 0 - 400.0 ] Set the speed below which the adjustable
*
frequency drive will go into Sleep mode.

3.15.2 22-6* Broken Belt Detection

The broken belt detection can be used in both closed-loop
and open-loop systems for pumps and fans. If the
estimated motor torque (current) is below the broken belt
torque (current) value (22-61 Broken Belt Torque) and the
adjustable frequency drive output frequency is above or
equal to 15 Hz, 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 adjustable frequency drive will continue to run,
but will 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 adjustable frequency 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.
NOTE!
Do not set 14-20 Reset Mode, to [13] Infinite auto reset
when 22-60 Broken Belt Function is set to [2] Trip. Doing so
will cause the adjustable frequency drive to continuously
cycle between running and stopping when a broken belt
condition is detected.
NOTE!
If the adjustable frequency drive is equipped with a
constant speed bypass with an automatic bypass function
that starts the bypass if the adjustable frequency 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:
10 % [5 - 100 %]
*
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
®
VLT HVAC Basic Drive Programming Guide
22-62 Broken Belt Delay
Range:
Function:
®
MG18B222 - VLT is a registered Danfoss trademark
Function:
the action selected in 22-60 Broken Belt
Function.
3 3
3-61