Speed Monitor; Motor Feedback Loss Timeout; Tracking Error Ramping; Tracking Error After Ramping Timeout - Danfoss VLT AutomationDrive FC 302 Programming Manual

Parameter Descriptions

4-32 Motor Feedback Loss Timeout

Range: Function:
enabling the function selected in
parameter 4-30 Motor Feedback Loss
Function.
4-34 Tracking Error Function
Option: Function:
This function is used to monitor that the
application follows the expected speed profile. In
closed loop, the speed reference to the PID is
compared to the encoder feedback (filtered). In
open loop, the speed reference to the PID is
compensated for slip and compared to the
frequency that is sent to the motor
(parameter 16-13 Frequency).
The reaction is activated if the measured
difference is more than the value specified in
parameter 4-35 Tracking Error for the time
specified in parameter 4-36 Tracking Error Timeout.
A tracking error in closed loop does not imply
that there is a problem with the feedback signal.
A tracking error can be the result of torque limit
at too heavy loads.
[0] Disable
[1] Warning
[2] Trip
[3] Trip after
stop
Warning/Alarm 78, Tracking Error is related to the tracking
error function.
4-35 Tracking Error
Range: Function:
10 [1 - 600 Enter the maximum allowed speed error
RPM RPM] between the motor speed and the output
*
of the ramp when not ramping. In open
loop, the motor speed is estimated and in
closed loop, it is the feedback from
encoder/resolver.
4-36 Tracking Error Timeout
Range: Function:
1 s [0 - 60 s] Enter the timeout period during which an error
*
greater than the value set in
parameter 4-35 Tracking Error is allowed.

4-37 Tracking Error Ramping

Range: Function:
100 [1 - 600 Enter the maximum allowed speed error
RPM RPM] between the motor speed and the output
*
of the ramp when ramping. In open loop,
the motor speed is estimated and in
closed loop, the encoder measures the
speed.
MG33MP02
Programming Guide
4-38 Tracking Error Ramping Timeout
Range:
1 s [0 - 60 s] Enter the timeout period during which an error
*

4-39 Tracking Error After Ramping Timeout

Range:
5 s [0 - 60 s] Enter the timeout period after ramping where
*

3.5.3 4-4* Speed Monitor

4-43 Motor Speed Monitor Function
Option:
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Function:
greater than the value set in
parameter 4-37 Tracking Error Ramping while
ramping is allowed.
Function:
parameter 4-37 Tracking Error Ramping and
parameter 4-38 Tracking Error Ramping Timeout
are still active.
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.
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