SD710 Series Servo Drive User Manal Chapter 10 Troubleshooting
2
10.1.2 Operating exceptions in position mode
After troubleshooting the above 10.1.1 Unable to enable problem, the Servo panel displays "On" when the following
phenomenon appears for the corresponding problem.
Table 10-1 Fault phenomenon and analysis when servo display "on" 1
Failure phenomena
Reasons
Confirmation method
Servo motor axis in
free running condition
Motor power cable not
connected
◆
Check that the motor side and side power cables U, V
and W are well connected.
The upper unit sends
a position command
and the Servo motor
does not rotate.
The pulse command
counter (Un006) is 0.
◆
Check if the control mode is position control mode
(Pn000.X=0).
◆
The pulse port is incorrectly wired.
Determine the power connection according to the interface
requirements when Pn200.XSet up is 0 or 1.
Whether the road meets the relevant specifications.
◆
Wrong type of pulse
Check that the external pulse type set by Pn201 is related to
the upper unit
Whether the position commands sent are consistent.
◆
No position command entered
Check if the pulse command disable function is used.
Use an oscilloscope to see if there is a pulse input (high or low
pulse) to the pulse interface.
Upper unit sends
position command,
Servo motor reverses
The pulse command
counter
(Un006)
counts the opposite of
actual.
◆
Check the command logic of the external pulse
Pn202ParametersSet up with the actual
Whether the input pulses correspond, if they do not, adjust the
logic direction corresponding to Pn202.
Normal operation
Positioning does not
turn, producing non-
conforming position
deviations.
◆
Confirmation of the upper unit position command
sending counter, Servo bit
Set the command counter, the motor feedback pulse counter
and the mechanical stop position. See "Steps for checking the
cause of faults in mis-positioning during normal operation".
Checking method for the cause of failure of inaccurate positioning during normal operation
Fig.
10.5 Block diagram of the position control principle
