haas SL 96-8710J Service Manual

Haas Technical Publications

Manual_Archive_Cover_Page Rev A

any other party automatically voids the factory warranty.

June 6, 2013

HAAS SERVICE AND OPERATOR MANUAL ARCHIVE

SL Series Service Manual 96-8710J RevJ English June 2004

• This content is for illustrative purposes.

• Historic machine Service Manuals are posted here to provide information for Haas machine owners.

• Publications are intended for use only with machines built at the time of original publication.

• As machine designs change the content of these publications can become obsolete.

• You should not do mechanical or electrical machine repairs or service procedures unless you are qualied
and knowledgeable about the processes.

• Only authorized personnel with the proper training and certication should do many repair procedures.

WARNING: Some mechanical and electrical service procedures can be

extremely dangerous or life-threatening.
Know your skill level and abilities.

All information herein is provided as a courtesy for Haas machine owners
for reference and illustrative purposes only. Haas Automation cannot be held
responsible for repairs you perform. Only those services and repairs that are
provided by authorized Haas Factory Outlet distributors are guaranteed.

Only an authorized Haas Factory Outlet distributor should service or repair a
Haas machine that is protected by the original factory warranty. Servicing by

Back

COMMON ABBREVIATIONS USED IN HAAS MACHINES

AC Alternating Current
AMP Ampere
APC Automatic Pallet Changer
APL Automatic Parts Loader
ASCII American St andard Code for Information Interchange
A T C Automatic T ool Changer
A TC FWD Automatic T ool Changer Forward
A TC REV Automatic T ool Changer Reverse
AWG American Wire Gauge
BHCS Button Head Cap Screw
B T British T ooling (Common usage)
CA D Computer Assisted Design
CAM Computer Assisted Manufacturing (Assisted Machining)
CAT - 5 Category 5 Cable
CB Circuit Breaker
C C Cubic Centimeter
CC W Counter Clock Wise
CF M Cubic Feet per Minute
CN C Computerized Numeric Control
CNCR SPINDLE Concurrent Spindle with axis motion
C R C Cyclic Redundancy Check digit
C R T Cathode Ray Tube
C T Caterpillar T ooling
CT S Clear T o Send
CW Clock Wise
DB Draw Bar
D C Direct Current
DGNOS Diagnostic
DHCP Dynamic Host Configuration Protocol
DIR Directory
DN C Direct Numerical Control
DO S Disk Operating System
DT E Data T erminal Equipment
ENA CNVR Enable Conveyor
EOB End Of Block
EOF End Of File
EPROM Erasable Programmable Read Only Memory
E-STOP Emergency S top
FHCS Flat Head Cap Screw
F T Foot
FU Fuse
FWD Forward
GA Gauge
HH B Hex Head Bolts
HP Horse Power
HS Horizontal Series of Machining Centers
I D Inside Diameter
IGBT Isolated Gate Bipolar Transistor
I N Inch
IOPCB Input Output Printed Circuit Board
LAN Local Area Network
LB Pound
LE D Light Emitting Diode
LO CLNT Low Coolant

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LOW AIR PR Low Air Pressure
L VPS Low Voltage Power Supply
MB Megabyte (1 million)
MCD RL Y BRD M -Code Relay Board
MD I Manual Data Input
MEM Memory
M- FI N M -code Finished
MM MilliMeter
MO CON Motor Control
MO TI F Motor Interface
MSG Message
MSHCP Metric Socket Head Cap Screw
N C Numerical Control
N C Normally Closed
NO Normally Open
O D Outside Diameter
OPER Operator
P Pocket
P ARAM Parameter
PCB Printed Circuit Board
PGM Program
PO R Power On Reset
POSIT Positions
PROG Program
PSI Pounds per Square Inch
PS T Pallet Schedule T able
PWM Pulse Width Modulation
RAM Random Access Memory
RET Return
REV CNVR Reverse Conveyor
RJ H Remote Jog Handle
RPDBDN Rotary Pallet Draw Bar Down
RPDBUP Rotary Pallet Draw Bar Up
RPM Revolutions Per Minute
RT S Request To Send
R X D Receive Data
S Spindle S peed
SD IS T Servo Distribution PCB
SFM Surface Feet per Minute
SHCS Socket Head Cap Screw
SI O Serial Input/Output
SKBIF Serial Key Board Inter Face PCB
SMTC Side Mount T ool Changer
SP Spindle
T T ool Number
T C T ool Changer
T I R Total Indicated Runout
T N C T ool Nose Compensation
TR P Tool Release Piston
TS Tail Stock
TS C Thru the Spindle Coolant
T XD Transmit Data
VD I Verein Deutscher Ingenieure
VMC Vertical Machining Center
WAN Wide Area Network

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1. TROUBLESHOOTING

This section is intended for use in determining the solution to a known problem. Solutions given are intended to
give the individual servicing the CNC a pattern to follow in, first, determining the problem’s source and second,
solving the problem.

The troubleshooting tips are organized in this section according to the area of the CNC that may be giving sign
of a problem. (Ex.: Out-of round circles in drilling will be found under the heading General Machine Operation ­Accuracy).

If the problem you are experiencing cannot be found under the heading you expect, please try several other
possible headings. If the problem is still not found, contact Haas Automation for further details.

BEFORE YOU BEGIN:

USE COMMON SENSE

Many problems are easily overcome by correctly evaluating the situation. All machine operations are composed
of a program, tools, and tooling. Y ou must look at all three before blaming one as the fault area. If a bored hole
is chattering because of an overextended boring bar, don’t expect the machine to correct the fault. Don’t
suspect machine accuracy if the vise bends the part. Don’t claim hole mis-positioning if you don’t first center­drill the hole.

FIND THE PROBLEM FIRST

Many mechanics tear into things before they understand the problem, hoping that it will appear as they go. We
know this from the fact that more than half of all warranty returned parts are in good working order . If the
spindle doesn’t turn, remember that the spindle is connected to the gear box, which is connected to the
spindle motor, which is driven by the spindle drive, which is connected to the I/O BOARD, which is driven by
the MOCON, which is driven by the processor. The moral here is don’t replace the spindle drive if the belt is
broken. Find the problem first; don’t just replace the easiest part to get to.

DON’T TINKER WITH THE MACHINE

There are hundreds of parameters, wires, switches, etc., that you can change in this machine. Don’t start
randomly changing parts and parameters. Remember , there is a good chance that if you change something,
you will incorrectly install it or break something else in the process. Consider for a moment changing the
processor’s board. First, you have to download all parameters, remove a dozen connectors, replace the board,
reconnect and reload, and if you make one mistake or bend one tiny pin it WON’T WORK. You always need to
consider the risk of accidentally damaging the machine anytime you work on it. It is cheap insurance to
double-check a suspect part before physically changing it. The less work you do on the machine the better .

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1.1 GENERAL M ACHINE O PERATION

MACHINE N OT R UNNING

Machine cannot be powered on.

• Check input voltage to machine (see "Electrical Service").

• Check main circuit breaker at top right of electrical cabinet; switch must be at the on position.

• Check overvoltage fuses (see "Electrical Service").

• Check wiring to POWER OFF button on front control panel.

• Check wiring to AUT O OFF relay to IOPCB.

• Check connection between 24V transformer and K1 contactor

• Check IOPCB (see "Electrical Service").

• Check POWER PCB (see "Electrical Service").

Machine can be powered on, but turns off by itself.

• Check settings #1 and #2 for Auto Of f T imer or Of f at M30.

• Check alarm history for OVERVOL T AGE or OVERHEA T shut down.

• Check AC power supply lines for intermittent supply.

• Check wiring to POWER OFF button on front control panel.

• Check connection between 24V transformer and K1 contactor.

• Check IOPCB (see "Electrical Service").

• Check Parameter 57 for Power Off at E-STOP.

• Check MOTIF or MOCON PCB (see "Electrical Service").

Machine turns on, keyboard beeps, but no CRT display.

• Check for power connections to CRT from IOPCB. Check for green POWER LED at front of CRT.

• Close doors and Zero Return machine (possible bad monitor).

• Check video cable (760) from VIDEO PCB to CRT .

• Check for lights on the processor.

Machine turns on, CRT works, but no keyboard keys work.

• Check keyboard cable (700B) from VIDEO to KBIF PCB.

• Check keypad (see "Electrical Service").

• Check KBIF PCB (see "Electrical Service").

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VIBRATION

Vibration is a subjective evaluation with perceptions varying among individuals, making it difficult to determine in
mild cases if there is an actual problem. In obvious cases, it is a matter of determining the source - which is
not easy , since all parts rot ate together and sound can be transferred readily . V ibrations also need to be
distinguished from noise such as a bad bearing. We will assume that vibrations would be something that could
be felt by putting your hand on the spindle ring. One crude method of measurement would be to take an
indicator on a magnetic base extended 10 inches between the turret and spindle housing and observe the
reading of the indicator. A reading of more than .001 would indicate excessive vibration. The two common
sources of noise are the spindle and axis drives. Most complaints about vibration, accuracy , and finish can be
attributed to incorrect machining practices such as poor quality or damaged tooling, incorrect speeds or feeds,
or poor fixturing. Before concluding that the machine is not working properly , ensure that good machining
practices are being observed. These symptoms will not occur individually (Ex. A machine with backlash may
vibrate heavily, yielding a bad finish). Put all of the symptoms together to arrive at an accurate picture of the
problem.

Machine vibrates while spindle is on and is not cutting. Sometimes only at specific RPM.

• If the spindle alone causes vibration of the machine this is usually caused by the belt/pulley drive system

or the chuck jaws are not centered correctly.

Machine vibrates while jogging the axis with the jog handle.

• The HAAS control uses very high gain accelerations curves. This vibration as you jog is simply the

servos quickly trying to follow the handle divisions. If this is a problem, try using a smaller division on
the handle. Y ou will notice the vibration more at individual clicks than when you are turning the handle
faster. This is normal.

The machine vibrates excessively in a cut.

• This is a tough one to call because machining practices come into play . Generally speaking, the least

rigid element of a cut is the tool because it is the smallest part. Any cutter will vibrate if pushed beyond
its tensile strength. In order to eliminate the machine as the source of the problem, you need to check
the spindle and the backlash of the axes as described in the following sections. Once machining
practices have been eliminated as the source of vibration, observe the machine in both operation and
“cutting air.” Move the axes (individually) without the spindle turning and then turn the spindle without
moving the axes. Isolate whether the vibration comes from the spindle head or from an axis.

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ACCURACY

Before you complain of an accuracy problem, please make sure you follow these simple do’s and don’ts:

• Ensure that the machine has been sufficiently warmed up before cutting parts. This will eliminate

mispositioning errors caused by thermal growth of the ballscrews (see "Thermal Growth" section).

• Don’t ever use a wiggler test indicator for linear dimensions. They measure in an arc and have sine/cosine

errors over larger distances.

• Don’t use magnetic bases as accurate test stops. The high accel/decel of the axis can cause them to

move.

• Don’t attach test points to the sheet metal of the spindle head.

• Don’t check for accuracy/repeatability using an indicator with a long extension.

• Ensure that test indicators and stops are absolutely rigid and mounted to machined casting surfaces

• Check a suspected error with another indicator or method for verification.

• Ensure that the indicator is parallel to the axis being checked to avoid tangential reading errors.

• Center drill holes before using jobber length drills if accuracy is questioned.

• Once machining practices have been eliminated as the source of the problem, determine specifically what

the machine is doing wrong.

Diameters are out of round

• Check that tooling and machining practices are correct. Bores will be out of round due to tool deflection

much more frequently than due to spindle bearing problems.

Drill

Diameters are incorrect in X-axis

• Ensure the tool probe is set up correctly (settings, etc.)

• Ensure tool offsets are coorect. Note that the coordinate system (F ANUC, YASNAC, HAAS) must be

selected before setting tools.

• Ensure Parameter 254, Spindle Center , is set correctly.

• Check for thermal growth of the X-axis ballscrew (see “Thermal Growth” section).

Center holes are malformed

• Ensure tooling is tight.

• Ensure Parameter 254, Spindle Center , is set correctly.

• Check spindle to turret pocket alignment. It may be out of alignment due to a crash or misadjustment.

• Check for thermal growth of the X-axis ballscrew (see “Thermal Growth” section).

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Part faces are conical

• Wedge may be out of alignment due to a crash.

• Check tooling setup. Turning long, unsupported parts may cause conical part faces.

• Check for thermal growth of the ballscrews (see Thermal Growth” section).

SL-Series

C

L

Part/Tooling Problem Geometry Problem

C

L

C

L

Bores are tapered

• Check that tooling and machining practices are correct. Bores will be tapered if the tooling is inappropriate,

the speeds and feeds are incorrect, or coolant is not getting to the cutting tool when required.

• Although it is rare, the spindle may be out of alignment due to a crash

• Check that the turret face is parallel with x-axis.

C

L

Outside diameter (O.D.) is tapered

• Check tooling setup. Turning long, unsupported parts can cause a tapered O.D.

• Check tailstock setup. Excessive hold pressure on the tailstock can distort parts.

• Spindle to Z-axis may be out of alignment (not parallel).

• Program around it. Reduce depth of final rough cut and finish pass to reduce part deflection.

C

L

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L

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C

L

C

L

Poor Technique

C

L

Material left after facing a part

• Ensure tooling is correct.

• Ensure turret is aligned to X-axis travel.

• Ensure Parameter 254, Spindle Center , is set correctly.

Material LeftAfter Facing Part

FINISH

Machining yields a poor finish

• Check the condition of the tooling and the spindle.

• Ensure turret is clamped.

• Ensure tooling is tight.

• Check tooling for chatter or lack of rigidity .

• Check the balance of the chuck, part, and fixture.

• Check for backlash.

• Check turret alignment.

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THERMAL G ROWTH

A possible source of accuracy and positioning errors is thermal growth of the ballscrews. As the machine
warms up, the ballscrews expand in both linear axes (X and Z), causing accuracy and positioning errors. This
is especially critical in jobs that require high accuracy .

NOTE: Thermal growth will be more noticeable in the X-axis, since errors will be

doubled when cutting a diameter.

Verify Thermal Growth

There are a number of ways to verify the problem. The following procedure will verify thermal growth of the X­axis reversed-anchored ballscrew in a machine that has not been warmed up:

1. Home the machine. In MDI mode, press POSIT and P AGE DOWN to the OPER p age.

2. Jog to an offset location. Select the X-axis and press the ORIGIN key to zero it.

3. Press the OFSET key, then scroll down to G110 (or any unused offset). Cursor to X and press the
P AR T ZERO SET key. This will set X) at this position.

4. Enter a program that will start at the new zero position, rapid a certain distance in the X direction,
feed the final .25 inches slowly , and then repeat the X movement.

5. In order to set up the indicator , run the program in SINGLE BLOCK mode, and stop it when X is at
the end of its set travel. Set the magnetic base on the spindle retainer ring or other rigid surface,
with the indicator tip touching the turret in the X-axis, and zero it.

6. Exit SINGLE BLOCK mode, and run the program for a few minutes. Enter SINGLE BLOCK mode
again, stop the program when X is at the beginning of its travel, and take a final reading on the
indicator. If the problem is thermal growth, the indicator will show a dif ference in the X position.

NOTE: Ensure the indicator setup is correct as described in “Accuracy” section. Error

in setup are common, and often incorrectly appear to be thermal growth.

7. A similar program can be written to test for thermal growth in the Z-axis.

Solutions

Since there are many variables that affect thermal growth, such as the ambient temperature of the shop and
program feed rates, it is difficult to give one solution for all problems.

Thermal growth problems can generally be eliminated by running a warm-up program for approximately 20
minutes before machining parts. The most effective warm-up is to run the current program, at an offset Z
position before the part. This will allow the ballscrews to warm up to the correct temperature and stabilize.
Once the machine is at temperature, the ballscrews won't expand any further , unless they are allowed to cool
down. A warm-up program should be run after each time the machine is lef t idle.

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1.2 SPINDLE

NOT T URNING

Spindle not turning

• If there are any alarms, see “Alarms” section.

• Check that the spindle turns freely when machine is off.

• If spindle is still not turning, replace MOCON PCB.

• Disconnect the drive belt. If the spindle will not turn, it is seized and must be replaced.

For Brush machines only:

• If spindle drive does not light the RUN LED, check forward/reverse commands from IOPCB.

Check that the drawtube piston is not bound against the spindle shaft on the air cylinder style.

• Check the wiring of analog speed command from MOTIF PCB to spindle drive (cable 720).

• Disconnect the drive belt. If the spindle will not turn, it is seized and must be replaced.

NOTE: Before using the replacement spindle, the cause of the previous failure must

be determined.

NOISE

Most noise attributed to the spindle actually lie in the motor or drive belt of the machine. Isolate the sources of
noise as follows:

Excessive noise coming from the spindle head area.

• Remove the left end covers and check the machine’s drive belt tension.

• Run the motor with the drive belt disconnected. If the noise persists, the problem lies with the motor . If it

disappears, go on to the next step.

• Check for the correct amount of lubrication to the spindle bearings (1cc per hour) in an air mist lubricated

spindle.

VECTOR D RIVE

T o properly troubleshoot the V ector Drive, use the following questions as a guide:

• What alarms are generated?

• When does the alarm occur?

• Is the Vector Drive top fault light on?

• Is there a fault light on any of the servo amplifiers?

• Does the alarm reset?

• Does the spindle motor turn at all?

• Does the spindle turn freely by hand?

• Have the C-axis parameters been confirmed?

• What is the input voltage to the vector drive unit?

• What does the DC Bus voltage measure? (320 VDC to 345 VDC)

• Does the DC Bus voltage displayed on the diagnostic page match the measured DC Bus voltage?

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All of the questions above must be answered. The DC Bus voltage should be between 320 VDC to 345 VDC
with the machine powered up but not running. If the voltage is not in this range, adjust the taps on the main
line transformer until this voltage range is achieved. There is a possibility the drive is faulty , but low Bus
voltage can also be caused by a shorted REGEN load or a shorted amplifier .

If the DC Bus voltage is below 50 VDC and never goes any higher, perform Steps 1-6.

1. With the machine powered up, is the green “POWER-ON” L.E.D. lit? If not, replace the Vector
Drive unit.

2. Power down the machine. Disconnect the REGEN load (terminals 1 and 2 on the V ector Drive
unit) and measure the resistance from each wire-to-chassis ground (open) and between the wire
leads. The resistance should be 8.6 ohms for machines with 20/15 V ector drives and HT10K
lathes equipped with 40/30 drives. All other machines with 40/30 drives should measure 6 ohms.
If not, replace the REGEN load or cabling.

3. Disconnect cable 490 at terminals 2 and 3 of the V ector Drive and from the servo amplifiers. With
a multimeter in the diode mode, place the red meter lead to the +HV terminal and the black meter
lead to the -HV terminal of each amplifier. The meter should read open.

4. Reverse the leads: Place the red meter lead on the -HV terminal and the black lead on the +HV
terminal. The meter should read .7 ohms in both instances. If not, replace the faulty amplifier .

5. Measure the resist ance between terminals 1 and 3 of the Vector Drive. The meter should read
greater than 100K ohms. If not, the Vector Drive is faulty.

6. If the green “POWER-ON” L.E.D. was lit (from S tep 2), leave both 490 cables (2 and 3) discon­nected from the drive and power up the machine.

a. Does the DC Bus voltage come up? If not, the Vector Drive is faulty .
b. Measure the voltage between terminals 1 and 3. The voltage should be 300

VDC or more. If not, the Vector Drive is faulty.

If both ‘a’ and ‘b’ check out okay, there is a problem with either the amplifiers or the REGEN load.

If the fault occurs upon acceleration -or- the spindle accelerates slowly -or- the spindle
makes noise, do the following:

7. Disconnect the output cables to the spindle motor. T urn on the machine and press <RESET>. Do
not command the spindle to turn. With a volt meter, measure the DC voltage between each output
phase (terminals 9, 10, and 11) to the 320V R TN (terminal 3). The meter should read 165 VDC in
each case, else one phase is faulty .

8. Measure the resistance across the motor wires from phase to phase and from each phase to
chassis. The meter should read .1 ohms phase-to-phase and open phase-to-chassis.

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If the fault occurs upon deceleration or acceleration just as the spindle reaches its speci­fied speed, or if an overvoltage alarm (119) occurred, do the following:

9. Disconnect the REGEN load resistors (terminals 1 and 2) and measure the resistance from each
wire lead-to-chassis ground and between the wire leads. The meter should read open lead-to­ground, and 6 ohms between the leads for machines with 40/30 Vector drives and 8.6 ohms
between the leads on machines with 20/15 Vector drives and HT10K mills.

10. Measure the resistance from terminal 1 to terminal 3. If the resistance is less than 100K, the drive
is faulty.

1 1. With the REGEN load left disconnected, power-up the machine and command a spindle speed of

700 RPM (300 RPM for lathes in high gear). Press <RESET> while monitoring the DC voltage
between terminal 1 and terminal 3. The voltage should read 330 VDC and then drop to less than
50 VDC momentarily . If not, that drive is faulty . If the volt age at RESET was okay and the alarm
was resettable, the REGEN load should be replaced even if the resistance appears to be

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1.3 TRANSMISSION (SL 30 AND 40)

The transmission cannot be serviced in the field and must be replaced as a unit. Never remove the motor from
the transmission, as this will damage the transmission and void the warranty .

NOISE

Excessive or unusual noise coming from transmission.

Operate the machine in both high and low gears. Monitor for noise in both gear positions, and determine if the
noise varies with the motor or output shaft speed.

• If the noise only occurs in one gear throughout the entire RPM range of that gear position, the problem lies

with the transmission, and it must be replaced.

• If the noise occurs in both gear positions, disconnect the drive belts (see “Transmission” section, Mechani-

cal Service) and repeat the previous step. If the noise persists, the transmission is damaged and must be
replaced.

• Disconnect the drive belts (see “Transmission” section, Mechanical Service) and run the machine in high

gear. Command a change of direction and listen for a banging noise in the transmission as the machine
slows down to zero RPM and speeds back up in reverse. If the noise occurs, the motor has failed and the
transmission must be replaced.

GEARS W ILL N OT C HANGE

Machine will not execute a gear change.

• Check the voltage to the gear shifter motor . The voltage between pins 2 and 3 should be approximately

+28V when high gear is commanded and -28V when low gear is commanded. If these voltages are correct,
the gear shifter motor has failed and the transmission must be replaced. If these voltages are incorrect, the
cabling or transmission power supply is at fault.

INCORRECT G EAR S ELECTED OR S ENSED

Spindle speed is not consistent with selected gear.

• Monitor the discrete inputs and outputs SP HIG and SP LOW on the diagnostics display while command-

ing high and low gear. The output SP HIG should be 1 when high gear is selected, and SP LOW should be
1 when low gear is selected. The inputs SP HIG and SP LOW should be 0 when that gear is engaged, and
should both be 1 when the transmission is between gears. These inputs should never read 0 at the same
time.

If any of these inputs/outputs are incorrect, either the gear change limit switches or the wiring to the I/O PCB is
at fault. The limit switches are located inside the transmission, and cannot be replaced.

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1.4 SERVO M OTORS / BALLSCREWS

NOT O PERATING

All problems that are caused by servo motor failures should also register an alarm. Check the alarm history to
determine the cause of the problem before any action is taken.

Servo motor is not functioning.

• Check the power cable from rear electrical cabinet to ensure connection is tight.

• Encoder is faulty or contaminated (Alarms 139-142, 153-156, 165-168, 182-185). Replace motor

assembly on brushless machines

• Open circuit in motor (Alarms 139-142, 153-156, 182-185). Replace motor assembly ("Axis Motor

Removal / Installation").

• Motor has overheated, resulting in damage to the interior components (Alarms 135-138, 176).

Replace motor assembly ("Axis Motor Removal/Installation").

• Wiring is broken, shorted, or missing shield (Alarms 153-156, 175, 182-185).

• Motor has overheated; no damage to the interior components. OVERHEA T alarm has been

triggered. Af ter thorough check of motor (DO NOT DISASSEMBLE!), take necessary steps to
eliminate the problem and alarm to resume operation. If motor is still inoperable, replace motor
assembly ("Axis Motor Removal/Installation").

• Check for broken or loose coupling between the servo motor and the ball screw. Replace or rep air

the coupling ("Axis Motor Removal/Installation")

• Check for a damaged ball screw, and replace if necessary ("Ball Screw Removal and Inst allation"

section).

NOTE: If a ball screw fails, it is most often due to a failed bearing sleeve. When

replacing the ball screw in an older machine, always replace the bearing
sleeve with the current angular contact bearing sleeve ("Bearing Sleeve
Removal and Installation" section).

NOISE

Ball screw noise is usually caused by a lack of lubrication and is usually accompanied by heating. Other
causes are misalignment, bearing sleeve damage, or ball nut damage. Check the alarm history of the machine
and look for axis overcurrent and following error alarms.

NOTE: Do not replace ball screws or bearing sleeves without due consideration; they

are extremely durable and reliable. Verify that customer complaints are not due
to tooling, programming, or fixturing problems.

Servo motor noise.

•Disconnect the servo motor from the ball screw and rotate by hand. If the noise persists, replace

the motor assembly ("Axis Motor Removal/Installation" section).

•If motor noise is caused by motor bearings, replace motor.

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Ball screw noise.

• Ensure oil is getting to the ball screw through the lubrication system. Look for a plugged metering

valve.

• Check for damage to the bearing sleeve.

SL-Series

NOTE: The current angular contact design sleeve has a fixed pre-load; it cannot be

adjusted.

• Run the axis back and forth. The motor will get very hot if the bearing sleeve is damaged. If so, turn

the axis by hand and feel for roughness in the ball screw. Loosen the clamp nut s at both ends of
the ball screw. If the symptom disappears, replace the bearing sleeve. Be cert ain to check for
damage to the ball screw shaft where the bearing sleeve is mounted. If the noise persists, the ball
screw is damaged and must be replaced. When replacing the ball screw in an older machine,
always replace the bearing sleeve with the current angular contact design bearing sleeve.

• Misalignment in the ball screw itself will tend to cause the ball screw to tighten up and make

excessive noise at both ends of the travel. The ballnut may get hot. Misalignment radially at the
yoke where the ball screw ball nut mounts is indicated by heating up of the ball nut on the ball
screw, and noise and tightness throughout the travel of the ball screw . Misalignment at the yoke
where the ball nut mounts is indicated by noise and tightness at both ends of the travel of the ball
screw. The ball nut may get hot.

NOTE: Customer complaints of Ball Screw noise may not indicate a bad screw.

Screws from different manufacturers produce varying levels of noise. Often
machines are built with two or more different brands of screws in the same
machine. If complaints are generated about one axis screw in comparison to
another, it is possible that the screws are simply sourced from different
manufacturers.

ACCURACY / BACKLASH

Accuracy complaints are usually related to tooling, programming, or fixturing problems. Eliminate these
possibilities before working on the machine.

Poor Z-axis accuracy .

• Check for a loose encoder on the servo motor. Also, ensure the key in the motor or the ball screw is in

place and the coupling is tight (Brush motors only).

• Check parameters for that axis.

• Check for backlash in the ball screw as outlined below.

Initial Preparation-

Turn the lathe ON. ZERO RET the machine and move the carriage to the approximate center of its travel in the
Z-axis. Move the turret to the approximate center of the X-axis travel.

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X-Axis:

1. Place a dial indicator and base on the spindle retaining ring with the tip of the indicator positioned
on the outside diameter of the turret, as shown in Fig. 1.4-1

Fig. 1.4-1 Dial indicator in position to check X-axis.

2. Set dial indicator and the “Distance to go” display in HANDLE JOG mode to zero as follows:

• Zero the dial indicator.

• Press the MDI button on the control panel.

• Press the HANDLE JOG button on the control panel.

The “Distance to go” display on the lower right hand corner should read: X=0 Z=0

3. Set the rate of travel to .001 on the control panel and jog the machine .010 in the positive (+) X
direction. Jog back to zero (0) on the display. The dial indicator should read zero (0) ± .0001.

4. Repeat step 3 in the negative (-) direction.

TOTAL DEVIATION BETWEEN THE DIAL INDICATOR AND THE CONTROL PANEL DISPLAY
SHOULD NOT EXCEED .0002.

An alternate method for checking backlash is to place the dial indicator as shown in Fig. 4-1 and manually
push on the turret in both directions. The dial indicator should return to zero after releasing the turret.

NOTE: The servos must be on to check backlash by this method.

Z-Axis:

1. Place a dial indicator and base on the spindle retaining ring with the indicator tip positioned on the
face of the turret as shown in Fig. 1.4-2.

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Fig. 1.4-2 Dial indicator in position to check Z-axis

2. Set dial indicator and the “Distance to go” display in the HANDLE JOG mode to zero as follows:

• Zero the dial indicator.

• Press the MDI button on the control panel.

• Press the HANDLE JOG button on the control panel. The “Distance to go: display on the lower

right hand corner should read: X=0, Z=0

3. Set the rate of travel to .001 on the control panel and jog the machine .010 in the positive (+) Z
direction. Jog back to zero (0) on the display . The dial indicator should read (0) ± .001.

4. Repeat S tep 3 in the negative (-) direction.

TOTAL DEVIATION BETWEEN THE DIAL INDICATOR AND THE CONTROL PANEL DISPLAY
SHOULD NOT EXCEED .0002.

An alternate method for checking backlash is to place the dial indicator as shown in Fig. 4-2 and manually
push on the turret in both directions. The dial indicator should return to zero after releasing the turret.

NOTE: The servos must be on to check backlash by this method.

VIBRATION

Excessive servo motor vibration.

• Check all Parameters of the suspected axis against the Parameters as shipped with the machine. If

there are any differences, correct those and determine how the Parameters were changed.

• A bad motor can cause vibration if there is an open or short in the motor . A short would normally

cause a GROUND FAUL T or OVERCURRENT alarm; check the ALARMS. An ohmmeter applied to the
motor leads should show between 1 and 3 ohms between leads, and over 1 megohm from leads to
chassis. If the motor is open or shorted, replace.

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OVERHEATING

Servo motor overheating.

• If a motor OVERHEA T alarm occurs (ALARMS 135-138), check the Parameters for an incorrect

setting. Axis flags in Parameters 1, 15, or 29 can invert the overheat switch (OVER TEMP NC).

• If the motor is actually getting hot to the touch, there is excessive load on the motor. Check the user’s

application for excessive load or high duty cycle. Check the ball screw for binding ("Accuracy/
Backlash" section). If the motor is binding by itself, replace in accordance with "Axis Motor Removal/
Installation".

SERVO E RROR

“Servo Error Too Large” alarms occur on one or more axes sporadically.

• Check motor wiring for shorts.

• Driver card may need replacement.

• Servo motor may need replacement.

• Check for binding in motion of ball screw.

BALL S CREWS - VISUAL I NSPECTION

The three main causes of Ball Screw failure are:

Loss of Lubrication
Contamination

Machine Crash
Wear of the nut balls and the screw threads is generally not an issue under proper operating conditions.
Each type of suspect cause will leave telltale signs on the Ball Screw itself.

Loss of Lubrication:

The lubrication system of the machine provides a layer of oil for the Ball Screw components to operate on,
eliminating metal-to-metal contact. Should a problem with the lubrication system develop, that failure will
accelerate all wear issues.

1. Dry metal-to-metal contact following lube breakdown will create intense heat at the contact points.
The nut balls will weld to the nut races due to the heat and pressure of the preload. When move­ment of the Ball Screw continues, the welds will be broken, ripping off particles of both the balls
and the races. This loss of diameter will reduce the preload, reducing machine accuracy .
Ball Screws with this type of wear, but no screw surface marring, can be rep aired by the factory .

2. A second cause of wear of the Ball Screws is material fatigue. Material fatigue typically occurs at
the end of the Ball Screw service life. Signs of material fatigue include black, contaminated
coolant, pitting of the screw surface, loss of preload, and metal flakes on the Ball Screw .
Ball Screws suffering from material fatigue are not repairable and are considered scrap.

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Contamination:

Contamination of the lubrication and/or coolant systems of the machine will produce problems with the Ball
Screws.

Check the condition of the lube on the Ball Screw threads.

1. If the lube is wet and clean, this indicates a properly functioning lube system.

2. If the lube is thick and dark, but free of metal chips, the lube itself is old and must be changed out.
The entire system should be cleaned of the old lube.

3. If the lube is wet and black, the lube system has been contaminated by metal particles. Inspect
the Ball Screws for wear.

Contamination of the lube and/or coolant systems can be caused by a wearing Ball Screw , or by metal chips
entering the systems through open or loose way covers. Check all way covers and seals for excessive clear­ances.

Machine Crash:

A hard machine crash can cause a Ball Screw to lock up. The static overload created during a machine crash
can break apart the Nut balls, denting the thread surfaces. Turning the Nut by hand will result in an obvious
grinding feeling and/or sound.

1. Check the screw for straightness.

2. Look for ball dents at the ends of the screw length. These indents will be a sure sign of a hard
machine crash. The inertia of the table is transferred, due to the sudden stop, directly to the balls
inside the Nut, creating impressions on the screw surface.

CLEANING

In most cases, a thorough cleaning of the suspect Ball Screw will resolve “bad screw” issues, including noise
complaints.

1. Manually jog the Nut to one end of the screw.

2. Visually inspect the screw threads. Look for metal flakes, dark or thick lube, or contaminated
coolant: See Visual Inspection - Contamination above.

3. Use alcohol, or other approved cleaning agent s, to wash the screw.

CAUTION! Do not use detergents, degreasers, or solvents to clean Ball Screws

or their components. Do not use water-based cleaners to avoid rust.

4. Jog the Nut to the other end of its travel. If metal flakes are now present on the screw threads, you
may have wear issues.

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5. Re-lubricate screw threads before returning the machine to service.

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1.5 TURRET C LAMP / UNLCAMP

Alarm 113 and 1 14

1) Check the tool changer solenoid.
A) Does the solenoid appear to be activating.?

I) If no, check power to the solenoid during a tool change. If there is voltage replace the solenoid.
II) If yes, go on.

B) Are the exhaust mufflers dirty?

I) If yes, remove the muffler and do a tool change. If the alarm goes away then replace the muffler
II) If no, proceed to the next step.

C) Is there water in the airlines?

I) If yes, insure that the air is now dry and replace the solenoid.
II) If no, proceed to the next step.

2) Check air pressure.
A) Is the main regulator set to a minimum 85 psi?
B) Does the air pressure drop more than 10 psi during a tool change?

I) If no, go to the next check.
II) If yes, the lathe has an insufficient volume of air . Must have a supply of 100 psi at 4 sfm at the
regulator. A small diameter air supply hose, hose length, and fitting size may restrict the volume
of air going to the machine.

3) Remove the top toolchanger cover. Confirm that the air cylinder is fully clamping (1 14 alarm) or fully

unclamping (1 13 alarm).

A) If yes, go to the next check,.
B) If no, try to push the air cylinder into position.

I) If the air cylinder will not fully clamp or unclamp disconnect the air cylinder from the cam lever
and retry . If the air cylinder still does not fully clamp or unclamp, replace the air cylinder.
II) If the air cylinder fully clamps and unclamps then:

1) Cam balls fell out of time with each other. This would be more common on the original
style cams. This design does not have a cage. Fully clamping the air cylinder by hand
should position the 3 balls correctly.

2) If this problem persists then the cams might be damaged. Replace with part numbers
93-8138 “cam upgrade kit”. This is a cam assembly with the cage. It is compatible with
all lathes.

4) Clamp switch or unclamp switch is failing or is out of adjustment. (Reed style or telemecanique switches).
A) Switch identification and adjustment.

I) Reed style switches- these types of clamp/unclamp switches are mounted on the air cylinder to
detect the clamp and unclamp position of the turret. The air cylinder has a magnetic piston,
which activates the switch when the magnetic piston is under it. This style detects the move­ ment of the piston, not the turret shaft.

1) Adjust the switch by first confirming that the air cylinder is fully clamped. While observ­ ing the diagnostic data for the control, slide the switch in one direction until the bit
changes from a “1” to a “0”. Mark the position with a pen then do the same while sliding
the switch in the other direction. Position the switch between the two markings and
tighten the clamp.

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2) If the alarm still persists then the switch might be failing. Change the clamp switch with
the unclamp switch at the air cylinder and at the lube panel. If the problem goes away
or changes to an unclamp alarm then replace the switch.

II) T elemecanique clamp/unclamp switches at the rear of the turret shaf t- these
types of switches detect the position of the turret shaft during a tool change,
these switches are installed on the same bracket which supports the turret
home switch, also called the a-axis home switch.
The amount of shaft movement or turret pop out is very important with this style
of switch. The switches are a direct indication of the position of the shaft. If the
turret in/out travel is not adjusted correctly or the switch bracket is holding the
switches too far apart then alarms during a tool change will occur .

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1.6 HYDRAULIC S YSTEM

HYDRAULIC P RESSURE

“Low hydraulic pressure” alarm (143).

• Check for any leaks.

• Check that the oil level is above the black line.

• Check that the oil pressure is within 50-500 psi. If the hydraulic unit needs to be replaced, see “Hydraulic

Unit Removal/Installation” section.

• Check that the temperature is less than 150 degrees. If the hydraulic unit needs to be replaced, see “Hydrau-

lic Unit Removal/Installation” section.

• Phasing changes cause the hydraulic unit to change directions resulting in alarm 134.

• Make sure the filter has been replaced within the last 6 months.

• If pressure drops below 40 PSI during activation of chuck or tailstock, an alarm will occur .

HYDRAULIC C HUCK

Chuck won’t clamp/unclamp.

• Check for alarm condition.

• Check display for “Low Hydraulic Pressure” alarm (134).

• Check that the oil pressure gauge is within 50-500 psi.

• Use a voltage meter to check the solenoid circuit breaker . Replace solenoid valve if faulty .

NOISE IN H YDRAULIC P OWER UNIT

Hydraulic power unit noise

NOTE: Noise in hydraulic unit should decrease a few minutes after start up

• Check for leaks in hose.

• Check that the oil level is above the black line.

• Check for loose pieces/hardware.

• Check for debris in motor/cooling fins.

• Remove, clean, and reinstall adjustment valves.

HYDRAULIC T AILSTOCK

Tailstock pulsates as it moves

Check operating pressure (Minimum operating pressure is 120 psi.).
Check for leaks at hydraulic cylinder.
Check for leaks at hose fittings.

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1.7 ELECTRICAL T ROUBLESHOOTING

SL-Series

CAUTION! Before working on any electrical components, power off the machine

ELECTRICAL A LARMS

and wait approximately 10 minutes. This will allow the highvoltage
power on the brushless amplifiers to be discharged.

Axis Drive Fault Alarm

• Blown amplifier - indicated by a light at bottom of amplifier when power is on. Replace amplifier.

• Amplifier or MOCON is noise sensitive. If this is the case, the alarm can be cleared and the axis

will run normally for a while.
T o check an amplifier , switch the motor leads and control cables between the amplifier and the one
next to it. If the same problem occurs with the other axis, the amplifier must be replaced. If the
problem stays on the same axis, It is either the MOCON or control cable. The problem could also
be the axis motor itself, with leads either shorted to each other or to ground, which is very rare.

• Amplifier faulting out for valid reason, such as overtemp, overvoltage, or +/-12 volt undervoltage

condition. This usually results from running a servo intensive program, or unadjusted 12 volt power
supply. Adjust voltage to correct specifications or replace the power supply.
Overvoltage could occur if regen load is not coming on, but this does not usually happen. The
problem could also be the axis motor itself, with leads either shorted to each other or to ground,
which is very rare.

Axis Overload

• The fuse function built into the MOCON has been overloaded, due to a lot of motor accel/decels, or

hitting a hard stop with the axis. This safety function protects the amplifier and motor , so find the
cause and correct it. If the current program is the cause, change the program. If the axis hits a
hard stop, the travel limits may be set wrong.

Phasing Error

• The MOCON did not receive the proper phasing information from the motors. DO NOT RESET the

machine if this alarm occurs. Power the machine down and back up. If the problem persists, it is
probably a broken wire or faulty MOCON connectors. This problem could also be related to the
Low Volt age Power Supply. Check to see if the L VPS is functioning properly.

Servo Error Too Large

• This alarms occurs when the difference between the commanded axis position and the actual

position becomes larger than the maximum that is set in the parameter .
This condition occurs when the amplifier is blown, is not receiving the commands, or the 320 volt
power source is dead. If the MOCON is not sending the correct commands to the amplifier, it is
probably due to a broken wire, or a PHASING ERROR that was generated.

Axis Z Fault or Z Channel Missing

• During a self-test, the number of encoder counts was found to be incorrect. This is usually caused

by a noisy environment, and not a bad encoder. Check all shields and grounds on the encoder
cables and the motor leads that come into the amplifiers. An alarm for one axis can be caused by
a bad grounding on the motor leads of another axis.

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Axis Cable Fault

• During a self-test, the encoder cable signals were found to be invalid. This alarm is usually caused

by a bad cable, or a bad connection on the motor encoder connectors. Check the cable for any
breaks, and the encoder connectors at the motor controller board. Machine noise can also cause
this alarm, although it is less common.

Alarm 101, "MOCON Comm. Failure"

• During a self-test of communications between the MOCON and main processor, the main

processor does not respond, and is suspected to be dead. This alarm is generated and the servos
are stopped. Check all ribbon cable connections, and all grounding. Machine noise can also
cause this alarm, although it is less common.

Alarm 157, "MOCON Watchdog Fault"

• The self-test of the MOCON has failed. Replace the MOCON.

Alarm 354 - Aux Axis Disconnected

When this alarm is generated, do not press RESET. Turn Setting 7 OFF. Enter DEBUG mode, then view the
Alarms/Messages page. On the Messages page, a code will appear similar to WO1. The list of codes and
their descriptions appears below:

WO1 Power was just turned on or failed. Check the ribbon cables from the Aux Axis PCB to the proces-

sor for correct routing. Check for communication problems between the processor and the Aux
Axis PCB.

WO2 Servo following error too large. Check the encoder for contamination or dirt. Check for an intermit-

tent connection at both ends of the motor cable.

WO3 Emergency Stop. The E-STOP button was pressed, or an E-ST OP condition occurred.
WO4 High load. Check for binding in the tool changer gearbox and motor. Rotate the carousel by hand

and feel for any binding. Make sure the tool holders are the correct weight.

WO5 Remote RS-232 commanded off. Check the ribbon cable and the voltage to the Aux Axis PCB.

Check for 1 15V AC (minimum) to the Aux Axis PCB from the main transformer. Check the fuse
holder and the fuse that is protecting this circuit.

WO6 Air or limit switch or motor overheat. Check that the motor is not hot. Check for any binding in the

motor. Check for overweight tooling.

WO7 Z channel fault. Either the encoder or the cable is bad. Change the encoder first, as it is easier to

change than the cable. If the problem persists, change the cable.

WO8 Over-current limit, stalled or PCB fault. Check for binding in the tool changer gearbox. Make sure

the belt is not too tight. Ohm out the motor cable, checking pins G to F (should be open), G to H
(should be open), and F to H (should read between 2.5 and 5 ohms). Check all the connections on
the Aux Axis PCB and motor cable.

WO9 Encode ES. Z channel is missing. Bad encoder or cable. See WO7.
WOA High voltage. Check the incoming voltage to the Aux Axis PCB. Incoming voltage must be 115

VAC. See WO5.

WOB Cable fault. Check the cable from the motor to the Aux Axis PCB. Check for loose connections at

each end.

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KEYBOARD D IAGNOSTIC

SL-Series

NOTE: Refer to the "Cable Locations" section of this manual for a drawing of the

Keyboard Interface PCB.

NOTE: This Keyboard Grid is for machines with a Keyboard Interface only. This

Keyboard Grid is not for machines with a Serial Keyboard Interface.

The following is an example of how to troubleshoot the keypad:

NOTE: Keypad Diodes 1-24 correspond to chart numbers 1-24.

Example

1. Pressing the RESET button will cause diodes 1 and 17 to conduct.

• With the POWER OFF read across diode 1.

• A typical reading is between .400-.700 ohms, note your reading.

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2. Press and hold the RESET button. If the diode is conducting, the reading should drop about .03 ohms.

• (If your reading was .486 and it dropped to .460, for a difference of .026; the diode is

good).

• The same will hold true for diode 17 in this example. If the reading stays the same or there

is no change, the diode is not conducting. Pull P2 and read between pins 1 and 17.

• Press and hold <RESET>. The meter should read a short (0 ohms) if not the keypad is

bad.

CRT TEST P ATTERN

This is current commands page displays a grid of 6 x 9 blocks which allows technicians to align the display on
the CRT and make sure the display is centered and ‘square’. The page is accessed by entering DEBUG mode
from the alarms screen, pressing CURNT COMDS, and then pressing P AGE UP.

SAVING THE M ACHINE I NFORMATION

T o review a machine’ s set-up save the parameters, settings, offsets, variables and G-code programs and alarm
history to a floppy disk. To do this, insert a blank diskette, press LISTPROG, POSIT, enter the machine's serial
number and press F2. The new file suffix will be “.HIS”.

1.8 BARFEEDER T ROUBLESHOOTING

Push finger works but the pushrod will not load (during initial installation), ensure there are relays installed in
the top two tool changer locations on the IOPCB. (K9 and K10). This can occur when installing a barfeeder on
an older machine.

Problem with accuracy or incorrect pushes: Try doing a new set up as G105 Q2, Q4 or Q5 may have inadvert­ently been changed. Once the barfeeder is installed and running the set up procedures should not have to be
repeated unless the bar feeder is moved or the the collet or chuck is is changed.

The End of Bar switch at the right of the transfer tray has a switch paddle that can stick in the down position.
This will cause erroneous bar lengths and other problems. The switch paddle can be formed slightly to assure
clearance in the opening in the transfer tray.

There is a small ampount of play in between the ball screw and the ball nut. This can set up a small amount of
vibration when very fast spindle speeds are used. This is normal operation and will not affect finished part.

Any time the transport assembly on the bar feeder is disassembled or changed, parameters 240, 1st Aux Max
Travel, and 244, 1st Aux Min T ravel, may be affected. If these parameters are not correctly set, malfunctioning
of the pushrod can occur and in some instances the barfeeder can crash. These parameters can be checked
by the following procedure:

1. Zero the bar feeder .

2. In handle jog mode, jog in the minus direction, until the V position on the screen
matches parameter 244.

26

3. Push down on the control arm positioner on the right side of the pushrod to ensure the rotation
control arm moves smoothly in and out of the notch on the left end. Loosen the two screws on the
fork activator and adjust if necessary.

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4. On the left end of the pushrod control arm is a pin that drops onto a notch when the pushrod is
loaded. This pin shopuld be just far enough to the left to clear the lobe in the notch. If this pin is
not in the correct position, use the jog handle to adjust it and enter the new number from the
screen into parameter 244.

5. To adjust p arameter 240 ensure the pushrod is unloaded and jog the push finger all the way to the
right. Paramter 240 should be set such that the carriage comes within about 3/8” of the ball screw
support end without hitting it. If not, adjust it using the jog handle and enter the V position from the
CRT into parameter 240.

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2. ALARMS

Any time an alarm is present, the lower right hand corner of the screen will have a blinking "ALARM". Push the
ALARM display key to view the current alarm. All alarms are displayed with a reference number and a com­plete description. If the RESET key is pressed, one alarm will be removed from the list of alarms. If there are
more than 18 alarms, only the last 18 are displayed and the RESET must be used to see the rest. The pres­ence of any alarm will prevent the operator from starting a program.

The ALARMS DISPLAY can be selected at any time by pressing the ALARM MESGS button. When there are
no alarms, the display will show NO ALARM. If there are any alarms, they will be listed with the most recent
alarm at the bottom of the list. The CURSOR and P AGE UP and P AGE DOWN buttons can be used to move
through a large number of alarms. The CURSOR right and left buttons can be used to turn on and off the
ALARM history display .

Note that tool changer alarms can be easily corrected by first correcting any mechanical problem, pressing
RESET until the alarms are clear , selecting ZERO RET mode, and selecting AUTO ALL AXES. Some mes­sages are displayed while editing to tell the operator what is wrong but these are not alarms. See the editing
topic for those errors.

The following alarm list shows the alarm numbers, the text displayed along with the alarm, and a detailed
description of the alarm, what can cause it, when it can happen, and how to correct it.

101 COMM. FAILURE WITH MOCON/MOCON MEMOR Y F AULT During a self-test of communications between the
MOCON and main processor the main processor does not respond, and one of them is possibly bad. Check cable
connections and boards. This alarm could also be caused by a memory fault which was detected on the MOCON.

102 SERVOS OFF Indicates that the servo motors are off, the tool changer is disabled, the coolant pump is off, and
the spindle motor is stopped. Caused by EMERGENCY STOP, motor fault, or power failure.

103 X SERVO ERROR TOO LARGE Too much load or speed on X-axis motor. The difference between the motor
position and the commanded position has exceeded Parameter 9. The motor may also be stalled, disconnected, or
the driver failed. The servos will be turned off and a RESET must be done to restart. This alarm can be caused by
problems with the driver, motor, or the slide being run into the mechanical stops.

104 Y SERVO ERROR TOO LARGE Too much load or speed on Y-axis motor. The difference between the motor
position and the commanded position has exceeded Parameter 23. The motor may also be stalled, disconnected, or
the driver failed. The servos will be turned off and a RESET must be done to restart. This alarm can be caused by
problems with the driver, motor, or the slide being run into the mechanical stops.

105 Z SERVO ERROR TOO LARGE Too much load or speed on Z-axis motor. The difference between the motor
position and the commanded position has exceeded Parameter 37. The motor may also be stalled, disconnected, or
the driver failed. The servos will be turned off and a RESET must be done to restart. This alarm can be caused by
problems with the driver, motor, or the slide being run into the mechanical stops.

106 A SERVO ERROR TOO LARGE Too much load or speed on A-axis motor. The difference between the motor
position and the commanded position has exceeded Parameter 51. The motor may also be stalled, disconnected, or
the driver failed. The servos will be turned off and a RESET must be done to restart. This alarm can be caused by
problems with the driver, motor, or the slide being run into the mechanical stops.

107 EMERGENCY OFF EMERGENCY STOP button was pressed. Servos are also turned of f. Af ter the E-STOP is
released, the RESET button must be pressed at least twice to correct this; once to clear the E-STOP alarm and once
to clear the Servo Off alarm. This alarm will also be generated if there is a low pressure condition in the hydraulic
counterbalance system. In this case, the alarm will not reset until the condition has been corrected.

108 X SERVO OVERLOAD Excessive load on X-axis motor. This can occur if the load on the motor over a period of
several seconds or even minutes is large enough to exceed the continuous rating of the motor. The servos will be
turned off when this occurs. This can be caused by running into the mechanical stops but not much past them. It can
also be caused by anything that causes a very high load on the motors.

109 Y SERVO OVERLOAD Excessive load on Y-axis motor. This can occur if the load on the motor over a period of
several seconds or even minutes is large enough to exceed the continuous rating of the motor. The servos will be
turned off when this occurs. This can be caused by running into the mechanical stops but not much past them. It can
also be caused by anything that causes a very high load on the motors.

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