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TB233 Rev1 Fanuc Yellow Cap Motor/Velocity Control Drive Setup for CNC11
Systems
The Fanuc Velocity Control Unit is a servo drive that is used to drive the Fanuc Yellow Cap and Black Cap motors This document
describes how an MPU11 system is setup to use the drive and motor Due to the requirements of the Fanuc drive an Optic4 must in
most cases be used to run them GPIO4D is the PLC and can be the drive if in rare cases there is an encoder on the ballscrew and a
tach on the motor In this case the GPIO4D can be used because no tach output is needed
Jumpers on the Fanuc Drive
 The drive has many jumpers in several locations and 5 potentiometers The configuration of the jumpers and potentiometers on the
reference system built by Centroid is detailed in the following table The Fanuc documentation name is listed as well It is best not to
change these jumpers from the settings they were at on the running system as there may be other optional accessories on the drives
that require different jumper settings Centroid cannot make recommendations about modifications to the jumper settings at this time
Jumper Installed Description
S1 Yes Tacho Gene Setting
S2 No Tacho Gene Setting
S3 No Compressor Enable
S4 No Gain Attenuator
S5 Yes High Frequency Gain
S6 Yes High Frequency Gain
S7 Yes Ripple Filter
S8 Yes High Gain C K T Enable
S9 No Capacitor for compensation C K T
S10 Yes Capacitor for compensation C K T
S11 No Capacitor for compensation C K T
S12 Yes DC Gain
S13 No DC Gain
S14 No Capacitor for High Gain
S15 No Set same as S15
S16 Yes Chopping Frequency Selector
S20 No Thermostat for xformer and Dischare unit enable
S21 No Brake Alarm Enable
S22 No DCAL Alarm Enable
S23 No TGLS Alarm Enable
S24 Yes OVC Alarm operating time selector
S25 No TGLS Alarm sensing level
S26 Yes Discharge Unit Selector
SL126 No Motor Selector for Armature Voltage Feedback
*Note The spare jumpers are numbered high to low starting closest to RV4 Their function is unknown at this time and it is
reccommended to leave them as they are set
Potentiometers on the Fanuc Drive
The Potentiometers RV1 RV2 and RV4 should be set to 50% before applying power to the drive RV3 and RV5 should be left alone
RV2 may need to be adjusted to remove an offset to the analog command input though only if there is a significant offset present It
should be checked on the smallest DC scale available with a multimeter while slowly turning RV2
Optic4 Hardware Setup
There is a jumper J13 that needs to be installed on the Optic4 for the Active High outputs to match the polarity that the Fanuc drive
expects The AC voltage for the E Stop contactor coil should go through the E Stop Relay 1 and 2 on H2 and the E Stop button so
that the Fanuc drive cannot become enabled until CNC11 is up and running the PLC program
PLC Logic
There are several things in the PLC program that need to be added for a Fanuc system There are two different enable signals to the
Fanuc Drive PRDY and ENB serve two different functions PRDY turns on the contactor in the drive and should be set when E Stop is
released ENB should be turned on when the specific axis is enabled and commanded to hold The fault signal from the Fanuc drive
also needs to be read so that proper notification is given to the user There is not a reset input on the Fanuc drive so any error from the
drive is fatal and should not be cleared A message should be given to indicate the system needs to be powered off and back on
Following is a snippet for checking the fault input and setting enable signals
Set PRDY input on the Fanuc drive
;set the 14th bit of word 5 to 1 if there are no faults
IF !SV_STOP && SV_MASTER_ENABLE THEN BITSET w5 14
IF SV_STOP || !SV_MASTER_ENABLE THEN BITRST w5 14
;set the Aux output on the Optic4 high or low
IF true THEN SV_DRIVE_CONTROL_2 = w5
Set ENB input on the Fanuc Drive
;enable the first axis if CNC11 says it should turn on
;later fault checking will cause a fault if it exists
IF SV_PC_POWER_AXIS_1 THEN SV_ENABLE_AXIS_1
Check for Drive Fault from Fanuc Drive
;read the status word containing the Optic4 fault input
;the fault input is bit 15 in the word so divide by 2^15 = 32768 to get one or zero
w7 = SV_DRIVE_STATUS_3 / 32768
;set the drive fault status if there is an error on any axis
IF w7 == 1 THEN SET SV_DRIVE_FAULT
CNC11 Configuration
Fanuc Yellow Cap systems take a tachometer input rather than encoder feedback CNC11 parameters 200 207 set the Tach output
on the Optic4 and should be set according to the type of Fanuc drives are in the system The values entered are Tach volts/1000RPM
and determine the way the Tach speed is reported to the Drive on the Tach output pin on the Optic4 The following table shows what
value should be enetered in each parameter
Drive Type Tach Volts / 1000 RPM
H00 H0 H5 3
H10 H20 H30 6
CNC11 parameters 300 315 setup the drive and encoder map for the system A standard 4 axis mill setup should be configured
according to the following table This table assumes using the four encoder inputs on the Optic4 for the 4 drives' feedback It also
assumes a spindle encoder coming into the first MPU11 onboard encoder Parameter 35 would be set to 4 in this case For a typical
lathe setup only the first two axes need to be entered but setting the parameters will not have adverse effects
Parameter Value
300 1
301 2
302 3
303 4
304 0
305 0
306 0
307 0
308 7
309 8
310 9
311 10
312 1
313 0
314 0
315 0
 PID Settings
 Initial PID Settings for tuning are in the following table
Parameter Value
Kp 0 02
Ki 0 0004
Kd 0 02
Kv1 65
Accel 0 25
Optic4 to Fanuc DC Drive
This is for the typical wiring of Fanuc DC systems where the encoder is on the motor Click here to see the full size drawing
GPIO4D to Fanuc DC Drive
This is for the atypical Fanuc system that is wired with the encoder on the ballscrew and a resolver on the motor Click here to see the
full size drawing
Document History
Rev1 Created on 2010 02 23
by #297