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Diagnostics
7 Diagnostics
7.1 Troubleshooting
Problem
When a PID tracking error too big error (19-93 Error Status) occurs,
the inverter also trips on ALARM 13 (overcurrent)
Parameter 32-80 Maximum Velocity (Encoder) needs adjusting.
The frequency converter frequently trips on ALARM 7 (DC
Overvoltage) while ramping down.
The frequency converter frequently trips on ALARM 13 (overcurrent)
while ramping up.
The correct target position is reached, but the PID tracking error
(parameter 34-56 Track Error) is too big while the motor is turning.
The option sometimes forgets changes to trajectory data after a
power cycle.
Table 7.1 Troubleshooting
MG33R302
Operating Instructions
Solution
•
Check the velocity setting.
•
Check encoder for correct rotation direction.
•
Check encoder wiring and parameter configuration.
•
Check for correct brake handling.
•
Check velocity limits.
•
The time set in parameter 3-81 Quick Stop Ramp Time is too
short. Increase the setting.
Increase the setting in parameter 3-03 Maximum Reference. Doing
this also affects the performance of the parameters 32-60 Propor-
tional Factor to 32-66 Acceleration Feed-Forward.
Smaller changes to parameter 3-03 Maximum Reference may not
have any noticeable effect on most of these parameters but 32-65
Velocity Feed-Forward should always be recalculated using the auto-
calculation function 19-19 FFVEL Auto-calculation.
•
Use a higher ramp time setting in parameter 19-17 Jog Ramp
Time for jogging and parameter 19-26 Index Ramp Down Time for
positioning.
•
Check PCD [6] Quickbus Target Deceleration.
•
If a lower ramp time is required, install a brake resistor.
•
The ramp settings require too much torque. Determine which
operation (manual move or positioning) caused the trip, and
then set the corresponding ramp time (parameter 19-17 Jog
Ramp Time for jogging and parameter 19-25 Index Ramp Up Time
for positioning) with a higher ramp time setting.
•
Check PCD [5] Quickbus Target Acceleration.
•
The PID controller may be unstable – optimise the PID controller
parameters.
•
Harder settings of the PID controller may be required – optimise
the PID controller parameters.
Changes to trajectory data values are not saved after power-down
unless parameter 19-29 Parameter Save is activated before power-
down.
Danfoss A/S © 04/2014 All rights reserved.
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