2.19.5. 22-6* Broken Belt Detection
The Broken Belt Detection can be used in both closed and open loop systems for pumps and fans.
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:
[0]
*
Disabled
[1] Warning
[2] Trip Selects the action to be performed if the Broken Belt condition
is detected
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 ac-
tive before carrying out the action selected in
Broken Belt Func-
tion
, par. 22-60.
2.19.6. 22-7* Short Cycle Protection
In some applications, there will often 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.
22-75 Short Cycle Protection
Option: Function:
[0]
*
Disabled
[1] Enabled
Disabled
[0]: Timer set in
Interval Between Starts
, par. 22-76 is
disabled.
Enabled
[1]: Timer set in
Interval between Starts
, par. 22-76 is
enabled.
2. Parameter Description VLT
®
AQUA Drive Programming Guide
206
MG.20.O2.02 - VLT
®
is a registered Danfoss trademark
2
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