Danfoss VLT AutomationDrive FC 301 Programming Manual page 84

Parameter Descriptions
3.5.3 4-4* Speed Monitor
4-43 Motor Speed Monitor Function
Option:
3 3
[0] Disabled
[1] Warning
[2] Trip
[3] Jog
[4] Freeze
Output
[5] Max Speed
82
VLT
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:
•
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.
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 Parameter 16-48 Speed Ref. After
Ramp [RPM]
Dotted Parameter 4-44 Motor Speed
line Monitor Max
Illustration 3.32 Speed Reference and
Maximum Allowed Speed Difference
The frequency converter reports warning 101,
Speed monitor when the speed is outside the
limit.
The frequency converter trips and reports
alarm 101, Speed monitor.
Danfoss A/S © 01/2018 All rights reserved.
®
AutomationDrive FC 301/302
4-43 Motor Speed Monitor Function
Option:
[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
[13] Trip/Catch
4-44 Motor Speed Monitor Max
Time
Range:
300
RPM RPM]
*
4-45 Motor Speed Monitor Timeout
Range:
0.1 s [0 - 60
*
s]
Function:
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.
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.
Function:
NOTICE
[10 - 500
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].
Function:
NOTICE
Only available in flux control principle.
Enter the timeout period during which a
deviation defined in parameter 4-44 Motor Speed
Monitor Max is allowable. The timer for this
parameter is reset if the deviation stops
MG33MO02