Mitsubishi MELDAS MDS-C1 Instruction Manual page 234

(4) Troubleshooting
1) Orientation does not take place (motor keeps rotating)
Cause
1 Parameter setting
values are incorrect
2 The specification are
not correct
3 Incorrect wiring
2) The motor overtravels and stops. (The motor sways when stopping.)
Cause
1 Parameter setting
values are incorrect
3) The stopping position deviates.
Cause
1 Mechanical cause
2 Noise
3 The magnetic sensor
installation direction is
incorrect
5. Spindle Adjustment
Investigation item
The orientation detector and
parameter do not match.
SP037 (SFNC5)
Motor PLG.............................. 4
Spindle encoder ..................... 1
Magnetic sensor..................... 2
Motor PLG orientation is attempted
with standard motor instead of motor
with Z phase.
The connector pin numbers are
incorrect,
The inserted connector number is
incorrect.
The cable is disconnected.
Investigation item
The gear ratio parameters:
SP025 (GRA1) to SP032 (GRB4) are
incorrect.
The phenomenon is improved when
the deceleration rate for orientation
parameter SP006 (CSP) is halved.
The phenomenon is improved when
the position loop gain parameters
SP001 (PGM) and SP002 (PGE) are
halved.
The orientation stop direction is set to
one direction (CCW or CW).
Investigation item
The stopping position is not deviated
with the encoder axis.
The position detector's cable is
relayed with a terminal block
(connector), etc.
The position detector cable's shield is
not treated properly.
The peeled section of signal wire at
the position detector cable's connector
section is large. (A large section is not
covered by the shield.)
Check the relation of the magnet and
sensor installation.
5 - 24
Remedy
Correctly set SP037 (SFNC5).
Change to a motor having a
PLG-built-in motor with Z phase.
Correct the wiring.
Replace the cable.
Remedy
Correctly set SP025 (GRA1) to
SP032 (GRB4).
Readjust SP006 (CSP)
Readjust SP001 (PGM), SP002
(PGE).
Set the SP097 (SPECO) bit 0, 1 to
"0".
Remedy
There is backlash or slipping, etc.,
between the spindle and encoder.
The gear ratio between the
spindle and encoder is not 1:1 or
1:2.
There is backlash or slipping
between the spindle and motor.
The gear ratio between the
spindle and motor is not 1:1.
Do not relay the cable.
Properly treat the shield.
Keep the peeled section to 3cm or
less when possible. Keep the
peeled section as far away from
the power cable as possible.
Correct the relation of the magnet
and sensor installation.
Remarks
For motor PLG
orientation
Remarks
This also applies to:
SP107 (CSP2)
SP108 (CSP3)
SP109 (CSP4)
SP121 (MPCSH)
SP122 (MPCSL)
This also applies to:
SP119 (MPGH)
SP120 (MPGL)
Remarks
For spindle encoder
orientation
For motor PLG
orientation
For magnetic sensor
orientation.