Broken Belt Detection - Danfoss VLT FC 102 Programming Manual

Parameter Descriptions
22-50 End of Curve Function
Option: Function:
NOTICE
Automatic restart resets the
alarm and restarts the system.
NOTICE
Do not set
parameter 14-20 Reset Mode, to
[13] Infinite auto reset, when
parameter 22-50 End of Curve
Function is set to [2] Alarm.
Doing so causes the frequency
converter to continuously cycle
between running and stopping
when an end-of-curve
condition is detected.
NOTICE
If the frequency converter is
equipped with a constant
speed bypass with an
automatic bypass function that
starts the bypass if the
frequency converter
experiences a persistent alarm
condition, be sure to disable
the automatic bypass function,
if [2] Alarm or [3] Man. Reset
Alarm is selected as the end-
of-curve function.
[0] Off End-of-curve monitoring is not
*
active.
[1] Warning The frequency converter continues
to run, but activates an end-of-
curve warning (warning 94, End of
curve). A frequency converter digital
output or a serial communication
bus can communicate a warning to
other equipment.
[2] Alarm The frequency converter stops
running and activates an end-of-
curve alarm (alarm 94, End of curve).
A frequency converter digital
output or a serial communication
bus can communicate an alarm to
other equipment.
[3] Man. Reset The frequency converter stops
Alarm running and activates an end-of-
curve alarm (alarm 94, End of curve).
A frequency converter digital
output or a fieldbus can
M0010001
Programming Guide
22-50 End of Curve Function
Option:
[4]
22-51 End of Curve Delay
Range:
10 s
*

3.20.5 22-6* Broken Belt Detection

The broken-belt detection can be used in both closed-loop
and open-loop systems for pumps, fans, and compressors.
If the estimated motor torque is below the broken-belt
torque value (parameter 22-61 Broken Belt Torque), and the
frequency converter output frequency is above or equal to
15 Hz, the broken-belt function (parameter 22-60 Broken
Belt Function) is performed.
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Function:
communicate an alarm to other
equipment.
Stop and Trip
Function:
[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 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.
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