Danfoss VLT FC 100 Series Programming Manual page 182

3. Parameter Description
22-50 End of Curve Function
Option:
*
Off
[0]
[1] Warning
[2] Alarm
3
NB!
Important: If using the cascade controller, the fixed speed pumps are not affected by the End of Curve function and will keep running.
22-51 End of Curve Delay
Range:
*
10 s [0 to 600 s]
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) and the frequency converter output frequency is above or equal to 15 Hz, the broken belt function (par. 22-60)
is performed
22-60 Broken Belt Function
Option:
* Disabled
[0]
[1] Warning
[2] Trip
22-61 Broken Belt Torque
Range:
*
10% [0 - 100%]
22-62 Broken Belt Delay
Range:
*
10 s [0 - 600 s]
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.
This means that any normal stop command can be overridden by the
Jog/Freeze) can be overridden by the
None of the two functions are active if
to 0, and not start counting until
182
Function:
End of Curve monitoring not active.
A warning is issued in the display [W94].
An alarm is issued and the frequency converter trips. A message [A94] appears in the display.
Function:
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
Function , will be activated. If the condition disappears before the timer expires, the timer will be reset.
Function:
Selects the action to be performed if the Broken Belt condition is detected
Function:
Sets the broken belt torque as a percentage of the rated motor torque.
Function:
Sets the time for which the Broken Belt conditions must be active before carrying out the action selected in par.
Broken Belt Function
22-60 .
Interval Between Starts function (par. 22-76).
Hand On Off
or modes have been activated via the LCP. If selecting
Auto
is pressed and an active start command applied.
MG.11.C5.02 - VLT
®
VLT
Minimum Run Time function (par. 22-77) and any normal start command (Start/
® is a registered Danfoss trademark
HVAC Drive Programming Guide
par. 22-50, End of Curve
Hand On Off
or , the two timers will be reset