Parameter 4-34 Tracking Error Function
Table 241: Parameter 4-34 Tracking Error Function
4-34 Tracking Error Function
Default value: Size related
Parameter type: Option
Setup: All setups
Conversion index: –
Data type: Uint8
Change during operation: True
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 com-
pared 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.
Option
Name
Description
[0]
Disable
[1]
Warning
[2]
Trip
[3]
Trip after stop
Warning/Alarm 78, Tracking Error
is related to the tracking error function.
Parameter 4-35 Tracking Error
Table 242: Parameter 4-35 Tracking Error
4-35 Tracking Error
Default value: 10 RPM
Parameter type: Range, 1 - 600 RPM
Setup: All setups
Conversion index: 67
Data type: Uint16
Change during operation: True
Enter the maximum allowed speed error 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.
Parameter 4-36 Tracking Error Timeout
Table 243: Parameter 4-36 Tracking Error Timeout
4-36 Tracking Error Timeout
Default value: 1 s
Parameter type: Range, 0 - 60 s
Setup: All setups
Conversion index: -2
Data type: Uint16
Change during operation: True
Enter the timeout period during which an error greater than the value set in
parameter 4-35 Tracking Error
is allowed.
Parameter 4-37 Tracking Error Ramping
Table 244: Parameter 4-37 Tracking Error Ramping
4-37 Tracking Error Ramping
Default value: 100 RPM
Parameter type: Range, 1 - 600 RPM
Setup: All setups
Conversion index: 67
Data type: Uint16
Change during operation: True
Enter the maximum allowed speed error 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.
AU373327181955en-000101 / 130R1208
130 | Danfoss A/S © 2021.08
Parameter Descriptions
VLT® AutomationDrive EZ FC 321
Programming Guide
