Danfoss VLT AutomationDrive FC 301 Programming Manual page 109

Parameter Descriptions
3.5.3 4-4* Speed Monitor
4-43 Motor Speed Monitor Function
Option: Function:
NOTICE
This parameter is only
available in the flux control
principle.
Select how the frequency converter
reacts when the motor speed
monitor-function detects overspeed
or wrong rotation direction.
When the motor speed monitor is
active, the frequency converter
detects an error if the following
conditions are true for a time
period specified in
parameter 4-45 Motor Speed Monitor
Timeout:
In speed closed loop, the actual
speed is the feedback from the
encoder measured during the time
defined in parameter 7-06 Speed PID
Lowpass Filter Time. In open loop,
the actual speed is the estimated
motor speed.
Speed
nRef
0rpm
-nRef
Solid
line
Dotted
line
Illustration 3.32 Speed Reference
and Maximum Allowed Speed
Difference
[0] Disabled
[1] Warning The frequency converter reports
warning 101, Speed monitor when
the speed is outside the limit.
M0013101
Programming Guide
•
The actual speed differs
from the reference speed
in parameter 16-48 Speed
Ref. After Ramp [RPM].
•
The difference between
the speeds exceeds the
value in
parameter 4-44 Motor
Speed Monitor Max.
Time
Parameter 16-48 Speed
Ref. After Ramp [RPM]
Parameter 4-44 Motor
Speed Monitor Max
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4-43 Motor Speed Monitor Function
Option: Function:
[2] Trip The frequency converter trips and
reports alarm 101, Speed monitor.
[3] Jog
[4] Freeze Output
[5] Max Speed
[6] Switch to
Open Loop
[7] Select Setup 1
[8] Select Setup 2
[9] Select Setup 3
[10] Select Setup 4
[11] Stop & Trip
[12] Trip/Warning The frequency converter reports
alarm 101, Speed monitor in running
mode and warning 101, Speed
monitor in stop or coast mode. This
option is only available in closed-
loop operation.
[13] Trip/Catch Select when there is a need to
catch a load, for example when
mechanical braking fails. This
option is available in closed loop
only.
The frequency converter trips and
reports alarm 101, Speed monitor in
running mode. In stop mode, the
frequency converter catches the
flying load and reports warning 101,
Speed monitor.
In catch mode, the frequency
converter applies holding torque to
control the 0 speed on a potentially
malfunctioning brake (closed loop).
To exit this mode, send a new start
signal to the frequency converter. A
coast or Safe Torque Off also
terminates the function.
4-44 Motor Speed Monitor Max
Range: Function:
NOTICE
300 RPM [10 - 500
*
RPM]
Only available in flux control
principle.
Enter the maximum allowable
speed deviation between the actual
mechanical shaft speed and the
value in parameter 16-48 Speed Ref.
After Ramp [RPM].
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