Danfoss VLT AutomationDrive FC 301 Programming Manual page 83

Parameter Descriptions
Speed
[rpm]
P 4-31
Illustration 3.31 Motor Feedback Speed Error
4-32 Motor Feedback Loss Timeout
Range: Function:
0.05 s [0.00 - Set the timeout value allowing the speed
*
60.00 s] error set in parameter 4-31 Motor Feedback
Speed Error to be exceeded before 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.
MG33MO02
Programming Guide
n
calc
n
actual
P 4-32 Time
[sec]
Danfoss A/S © 01/2018 All rights reserved.
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.
4-38 Tracking Error Ramping Timeout
Range: Function:
1 s [0 - 60 s] Enter the timeout period during which an error
*
greater than the value set in
parameter 4-37 Tracking Error Ramping while
ramping is allowed.
4-39 Tracking Error After Ramping Timeout
Range: Function:
5 s [0 - 60 s] Enter the timeout period after ramping where
*
parameter 4-37 Tracking Error Ramping and
parameter 4-38 Tracking Error Ramping Timeout
are still active.
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