Danfoss VLT HVAC Drive FC 131 Programming Manual page 166

VLT® HVAC Drive FC 131
Programming Guide
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 is steady during the entire period, the function set in parameter 22-50 End of Curve Function is activated. If the condition
disappears before the timer expires, the timer is reset.
Table 395: Range:
Min: 0 s
4.16.6 22-6* Broken Belt Detection
Parameters for setting up broken-belt detection. The function monitors the motor torque.
Use broken-belt detection in both closed-loop systems and open-loop systems for pumps and fans. If the estimated motor torque
(current) is below the broken-belt torque (current) value (parameter 22-61 Broken Belt Torque), and the drive output frequency is
above or equal to 15 Hz, parameter 22-60 Broken Belt Function is performed.
22-60 Broken Belt Function
Default value: [0] Off
Conversion index: -
Select the action to be performed if the broken-belt condition is detected.
Do not set parameter 14-20 Reset Mode to [13] Infinite auto reset, when parameter 22-60 Broken Belt Function is set to [2] Trip. Doing
so causes the drive to continuously cycle between running and stopping when a broken-belt condition is detected.
If the automatic bypass function is enabled, the bypass starts when the drive experiences a persistent alarm condition. In this
case, disable the automatic bypass function if [2] Trip is selected as the broken-belt function.
Table 396: Option:
[0] Off This function is not active.
[1] Warning The drive continues to run, but activates a broken-belt warning (warning 95, Broken Belt). A drive digital output or
a serial communication bus can communicate the warning to other equipment.
[2] Trip
The drive stops running and activates a broken-belt alarm (alarm 95, Broken Belt). A drive digital output or a serial
communication bus can communicate the alarm to other equipment.
22-61 Broken Belt Torque
Default value: 10%
Conversion index: 0
Set the broken-belt torque as a percentage of the rated motor torque.
Table 397: Range:
Min: 5%
22-62 Broken Belt Delay
Default value: 10 s
Conversion index: 0
Set the time for which the broken-belt conditions must be active before carrying out the action selected in parameter 22-60 Broken
Belt Function.
166 | Danfoss A/S © 2022.05
Max: 600 s
Parameter type: Option
Data type: u_int8
N O T I C E
N O T I C E
Parameter type: Range
Data type: u_int8
Max: 100%
Parameter type: Range
Data type: u_int16
Default value: 10 s
2-setup: All setups
Change during operation: True
2-setup: All setups
Change during operation: True
Default value: 10%
2-setup: All setups
Change during operation: True
AU370727746889en-000101 / 130R0994
Parameters