SD710 Series Servo Drive User Manal Chapter 10 Troubleshooting
3
The main causes of misalignment are.
(1) The number of pulses A sent by the upper unit is not the same as 's pulse counter B (Un006), caused by.
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Incorrect input position command count due to noise in the wiring of the upper unit command output device (PLC,
motion controller, etc.) and Servo . The following checks can be carried out to deal with this:
A.
Check that the pulse input terminals are twisted shielded.
B.
Check if it is the open collector input method in the low speed pulse input, if so change to differential input.
C.
Check if it is a low speed pulse input, if so, turn on the pulse command hardware filter (Pn200.Y).
D.
Depending on the maximum pulse frequency, the appropriate software filter time for the pulse command is
selected (Pn200.Y).
E.
Be sure to wire the pulse input terminals separately from l1c, l2c, l1, l2 and l3.
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The pulse command filtering time (Pn004.Z) on the servo r side is not set correctly, resulting in a loss of the
normal pulse signal or abnormalities. If so, select the appropriate pulse command software filter time based on the
maximum pulse frequency.
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Ifduring normal operation of the motor, the signal output to the from the upper computer command output
device (PLC, motion controller, etc.) is interrupted, check whether there is an open pulse command forbidden to receive
or a pulse deviation clear signal on the side.
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Whether the motor encounters a forward/reverse overtravel limit switch during operation.
(2) 's pulse counter B (Un006) and motor feedback pulse counter C (Un007) are not the same, caused by
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If the motor is equipped with an incremental Coder, it is possible that the motor Coder is affected by noise and
the Coder feedback signal counts incorrectly.
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If the motor is equipped with an incremental Code device, the pulse reception count may be abnormal due to poor
wiring contact caused by the cable not being tightened at both ends.
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Check whether a fault or failure of the enable signal has occurred during operation, resulting in the command not
being fully executed.
If, despite checking that the signal counts in (1) and (2) above are normal, there is still an inaccurate
positioning, then.
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Check that there is no relative slippage in the connection between the motor and the load, and if there is, deal
with it accordingly.
If, despite checking all of the above, there is still misalignment, then.
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Check that the electronic gear ratio setting in is reasonable and correct.
If, despite checking all of the above, there is still misalignment, then.
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Machining tolerances exist for mechanical loads, try using a fully closed loop.
