bnp-b2365(eng)b.pdf - 第292页

5. Spindle Adjustment 5 - 47 (4) Setting orientation positioning accuracy check The positioning accuracy at ori entation control is checked by the param eters shown below. An error is detected if the positioning pul se e…

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5. Spindle Adjustment
5 - 46
[3] Speed loop delay compensation adjustment
This adjustment selects the delay compensation control used at normal orientation stops for
tool changes, etc. Becau se the full-clo sed loop cont rol use d by the spin dle end d etector, etc., is
prone to overshooting at stops, the speed loop gain delay advance term (SP100) value is
adjusted upward.
SP100 value that is too high, however, will result in stop position inconsistency, particularly on
high-friction machines. In cases where stop position accuracy is required on spindles with high
frictional torques, set SP100=0, and select PI control.
<Examples of using PI control>
•
Positioning a workpiece with a lathe
• A machine that indexes a 5-plane machining atta chment
No. Abbr. Parameter name Details
Setting
range
Standard
SP100 VGOD* Orientation control
mode speed loop
gain delay advance
term
Set a loop gain delay advance gain in orientation control mode.
When this parameter is set to "0", PI control is applied.
0 to 1000 15
POINT
When forward and reverse run stop posi t ions differ even with PI control, machine's
backlash may be large. In such cases, accuracy can be improved by setting
orientation po sitioning direction as one direction only (unidirectional). (Refer to
spindle parameter SP097/bit0, 1)
[4] Torque limit adjustment
The torque during post-orientation stops is limited by the parameter shown below. In case of
performing a mechanical lock at orientation stops, be sure to lower the torque limit value to
avoid interference between the spindle motor and the machine.
If a torque limit is commanded by a spindle control input 1 even during an orientation stop,
however, the torque limit will be applied.
No. Abbr. Parameter name Details
Setting
range
Standard
SP104 TLOR* Torque limit value
after orientation
completed l
Set the torque limit value after orientation completed.
If the external torque limit signal is input, the torque limit value
set by this parameter is made invalid.
0 to 120
(%)
100
CAUTION
In case of locking the spindle mechanically at orientation stop s, be sure to enter a
torque limit to restrict the motor's output torqu e. (Reco mmended torque limit:
10% or less)
5. Spindle Adjustment
5 - 47
(4) Setting orientation positioning accuracy check
The positioning accuracy at orientation control is checked by the parameters shown below. An
error is detected if the positioning pulse error amount from the reference position (Z-phase)
exceeds the orientation control pulse miss check value (SP114). When an error is detected, the
spindle continues rotating until the next reference position is detected, and a positioning retry then
occurs. The "A9" warning is activated during the posi tioning retry, and the "5C" alarm is a ctivated if
the number of retries exce eds the number of orientation retry times (SP118).
No. Abbr. Parameter name Details
Setting
range
Standard
SP114 OPER Orientation control
pulse miss check
value
An alarm "5C" will occur if the pulse miss value at the
orientation stop exceeds this setting value. (Note that this is
invalid when set to "0".)
In this parameter, set the value to fulfill the following conditions.
SP114 setting value > 1.5 × SP004
(orientation in-position width)
0 to 32767
(360deg
/4096)
0
SP118 ORCT Orientation control
number of retry times
Set the number of times to retry when an orientation or
feedback error occurs.
The warning (A9) is issued while retrying orientation, and an
alarm (5C) is issued when the set number of times is exceeded.
0 to 100
(time)
0
5. Spindle Adjustment
5 - 48
(5) Troubleshooting
[1] Orientation does not take place (motor keeps rotating)
Cause Investigation item Remedy Remarks
1 Parameter setting
values are incorrect
The orientation detector and
parameter do not match.
SP037 (SFNC5)
Motor PLG.............................. 4
Spindle end detector .............. 1
Magnetic sensor..................... 2
Correctly set SP037 (SFNC5).
2 The specification are
not correct
Motor PLG orientation is attempted
with standard motor instead of motor
with Z phase.
Change to a motor having a
PLG-built-in motor with Z phase.
For motor PLG
orientation
3 Incorrect wiring The connector pin numbers are
incorrect,
The inserted connector number is
incorrect.
The cable is disconnected.
Correct the wiring.
Replace the cable.
[2] The motor overtravels and stops. (The motor sways when stopping.)
Cause Investigation item Remedy Remarks
1 Parameter setting
values are incorrect
The gear ratio parameters:
SP025 (GRA1) to SP032 (GRB4) are
incorrect.
Correctly set SP025 (GRA1) to
SP032 (GRB4).
The phenomenon is improved when
the deceleration rate for orientation
parameter SP006 (CSP) is halved.
Readjust SP006 (CSP) This also applies to:
SP107 (CSP2)
SP108 (CSP3)
SP109 (CSP4)
SP121 (MPCSH)
SP122 (MPCSL)
The phenomenon is improved when
the position loop gain parameters
SP001 (PGM) and SP002 (PGE) are
halved.
Readjust SP001 (PGM), SP002
(PGE).
This also applies to:
SP119 (MPGH)
SP120 (MPGL)
The orientation stop direction is set to
one direction (CCW or CW).
Set the SP097 (SPECO) /bit 0, 1
to "0".
[3] The stopping position deviates.
Cause Investigation item Remedy Remarks
1 Mechanical cause The stopping position is not deviated
with the encoder axis.
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.
For spindle end
detector orientation
There is backlash or slipping
between the spindle and motor.
The gear ratio between the
spindle and motor is not 1:1.
For motor PLG
orientation
2 Noise The position detector's cable is
relayed with a terminal block
(connector), etc.
Do not relay the cable.
The position detector cable's shield is
not treated properly.
Properly treat the shield.
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.)
Keep the peeled section to 3cm or
less when possible. Keep the
peeled section as far away from
the power cable as possible.
3 The magnetic sensor
installation direction is
incorrect
Check the relation of the magnet and
sensor installation.
Correct the relation of the magnet
and sensor installation.
For magnetic sensor
orientation.