2.19.6 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:
Selects the action to be performed if the Broken Belt condition is detected
[0] *
Off
[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
.
2.19.7 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
Timer set in par. 22-76
Interval between Starts
is disabled.
[1]
Enabled
Timer set in par. 22-76
Interval between Starts
is enabled.
22-76 Interval between Starts
Range:
Function:
Application
dependent*
[Application dependant]
22-77 Minimum Run Time
Range:
Function:
0 s*
[Application dependant]
Sets the time desired as minimum run time after a normal start command (Start/Jog/Freeze). Any
normal stop command will be disregarded until the set time has expired. The timer will start counting
following a normal start command (Start/Jog/Freeze).
The timer will be overridden by a Coast (Inverse) or an External Interlock command.
VLT
p
Automation VT Drive FC322
Programming Guide
2 Parameter Description
MG.20.W1.22 - VLT
p
is a registered Danfoss trademark
221
2
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