15-B Maintenance Mnl, GFZ-62075E/03 - Automation Service Srl

3. TROUBLESHOOTING AND ACTION TO BE TAKEN
B–62075E/03
(3) The deviation of the return position is very small.
Item
1
2
Possible cause of the
problem
Momentary cable disconnection
Improper connection
of connectors
The Main CPU board, sub
CPU board, or additional
axis board is defective, or
servo amplifier is defective.
How to check the cause
Check that the cable connectors are
clamped and fixed securely.
Check the soldering of each connector
again.
Check the cables are not disconnected,
particularly at the bent portions.
Specify 0 for bit 7 of parameter No. 1800
to suppress drift compensation, and
check the positional deviation using the
diagnosis function (DGN data in parameter
Nos. 3000 and thereafter). The variation
of the offset results in positional
deviation and variation when the machine
stops moving.
Replace the main CPU or sub board, or
the printed circuit board of the servo amplifier.
Action to take
Correct any improper
cable connection.
Replace the axis control
printed circuit board or the
printed circuit board of the
servo amplifier.
How to check the reference position return motion and the position of the deceleration dog
(1) Set each parameter according to the table below.
For parameter No. 1850, set the grid deviation to 0 at the beginning.
Parameter No.
Description
1400 A
Sets whether manual rapid traverse is effective without returning the machine to
the reference position.
1006 A Direction of reference position return
1816 A Sets the capacity of the reference counter for the X and Z axes in that order.
1005 A
Sets whether the reference position return function is effective, and sets how the
machine is returned.
1850 A Sets the grid deviation for the X and Z axes in that order.
1425 A Sets the low feedrate (FL) in the reference position return motion.
1240 A
Sets the coordinates of the reference position in the machine coordinate system.
1024 A Sets the FM feedrate for reference position return with the magnetic switch.
(2) Return the machine to the reference position and check that the motion is normal.
If the reference position needs to be adjusted, follow the procedure below.
(i) For the grid method: The reference position can be adjusted by changing the grid deviation
(parameter No. 1580). If the reference position needs to be moved by the
distance moved by one rotation of the position detector (pulse coder or
Resolver), also move the deceleration dog.
(ii) For the magnetic switch method: Adjust the position of the proximity switch.
(3) Check the position of the deceleration dog. (Only when the grid method is used)
(i) Return the machine to the reference position.
(ii) Note down the displayed position of the machine when at the reference position.
(iii) While checking the deceleration dog signal (*DECX or *DECZ) using the diagnosis function, move the
machine at low speed from the reference position toward the dog until this signal turns on.
(iv) From the results obtained in (ii) and (iii) above, calculate the distance from the reference position to
the position at which the deceleration dog signal turns on. Adjust the position of the deceleration dog
so that this distance is about half the distance moved by one rotation of the position detector.
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