22-50 End of Curve Function
Option:
Function:
[0]
*
Off
End of Curve monitoring not active.
[1]
Warning
A warning is issued in the display [W94].
[2]
Alarm
An alarm is issued and the frequency converter trips. A message [A94] appears in the display.
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:
Function:
10 s
*
[0 to 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) 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:
Function:
Selects the action to be performed if the Broken Belt condition is detected
[0]
*
Disabled
[1]
Warning
[2]
Trip
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.
This means that any normal stop command can be overridden by the
Minimum Run Time
function (par. 22-77) and any normal start command (Start/
Jog/Freeze) can be overridden by the
Interval Between Starts
function (par. 22-76).
None of the two functions are active if
Hand On
or
Off
modes have been activated via the LCP. If selecting
Hand On
or
Off
, the two timers will be reset
to 0, and not start counting until
Auto
is pressed and an active start command applied.
3. Parameter Description
VLT
®
HVAC Drive Programming Guide
182
MG.11.C5.02 - VLT
®
is a registered Danfoss trademark
3