Danfoss VLT AQUA Drive FC 200 Programming Manual page 157

Parameter Description
NOTICE!
Automatic restart will reset the alarm and start the system
again.
NOTICE!
Do not set 14-20 Reset Mode, to [13] Infinite auto reset,
when 22-50 End of Curve Function is set to [2] Alarm. Doing
so will cause the adjustable frequency drive to contin-
uously cycle between running and stopping when a End of
Curve condition is detected.
NOTICE!
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] Alarm or [3]
Man. Reset Alarm is selected as the End of Curve Function.
22-51 End of Curve Delay
Range: Function:
10 s [0 - 600 When an end of curve condition is detected, a
*
s] 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 22-50 End of Curve Function
will be activated. If the condition disappears
before the timer expires, the timer will be reset.
3.19.6 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 is below the broken belt torque
value (22-61 Broken Belt Torque) and the adjustable
frequency drive output frequency is above or equal to 15
Hz, the broken belt function (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]. An
adjustable frequency 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]. An
adjustable frequency drive digital output or a serial
®
VLT AQUA Drive Programming Guide
NOTICE!
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.
NOTICE!
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.
10 %
10 s
3.19.7 22-7* Short Cycle Protection
In some applications, there is often 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 22-77 Minimum Run Time and any normal
start command (Start/Jog/Freeze) can be overridden by
22-76 Interval between Starts.
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 On] is pressed and an active start
command applied.
®
MG20O622 - VLT is a registered Danfoss trademark
22-60 Broken Belt Function
Selects the action to be performed if the Broken Belt condition is
detected
Option: Function:
communication bus can communicate an alarm to
other equipment.
22-61 Broken Belt Torque
Range: Function:
[0 - 100 %] Sets the broken belt torque as a percentage
*
of the rated motor torque.
22-62 Broken Belt Delay
Range: Function:
[0 - 600 s] Sets the time for which the broken belt
conditions must be active before carrying out
the action selected in 22-60 Broken Belt
Function.
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