Tag Archives: fanuc cnc

FANUC Controls Alarms

Fanuc AC Spindle Amp Alarms

fanuc cnc

FANUC AC Spindle Amp Alarms

Recently we had a customer running a FANUC A06B-6044-H030 spindle unit which was throwing an alarm code. With these FANUC Spindle Amps, the alarming diagnosis is slightly convoluted, so we wanted to do a post explaining how to read the Fanuc AC spindle amp alarms on the top of these units along with the corresponding faults that the alarms relate to.

On these AC spindle units that start with A06B-6044 the fault is shown through the four red LED lights on the top of the spindle card that has a part number similar to A20B-1000-0690. Above the LED lights there are the numbers 8, 4, 2, and 1. If you have a fault in your spindle amp, one or more of the lights will go on, and you just need to add the corresponding numbers to get your alarm code. If only the light under the 4 is on that means an alarm 4, and if the 8 and 1 lights are on it is an alarm 9. This alarm will help to diagnose where the problem in your system is.

Here is a list of the alarm codes and what the possible causes/solutions for the alarms would be.

Alarm 01 (AL-01) Motor Overheat
Causes:
Damaged motor fan, overload, motor cooler is dirty, loose connection.
Solution:
Replace parts, clean cooler, check connections, review cutting conditions.

Alarm 02 (AL-02) Excessive Speed Deviation
Causes:
Overload, transistor module is damaged, loose connections, error with speed feedback signal, blown fuse.
Solution:
Replace parts, check connections, review cutting conditions.

Alarm 03 (AL-03) Blown Fuse in DC Link Section
Causes:
Indicates that the fuse F7 in DC link is blown
Solution:
Check power transistors and replace the fuse.

Alarm 04 (AL-04) Input fuse blown / Input power open phase
Causes:
Defective transistor module, blown fuse.
Solution:
Replace parts, replace the fuse.

Alarm 05 (AL-05) Control Fanuc Power Supply Fuse Blown. AF2 or AF3
Causes:
Defective PCB, Abnormal power supply voltage.
Solution:
Check power supply, replace Fanuc Board, replace the fuse.

Alarm 07 (AL-07) Excessive Speed
Causes:
Incorrect parameter setting.
Solution:
Reset parameter value.

MRO Electric supplies and repairs FANUC Spindle Amps. For more information or to request a price quote, please call 800-691-8511 or email sales@mroelectric.com.

Alarm 08 (AL-08) High Input Voltage
Causes:
AC power supply too high, incorrect setting of the toggle switch for voltage setting.
Solution:
Change the setting from 200V to 230V.

Alarm 09 (AL-09) Heatsink is overheated
Causes:
The cooling fan is defective, overload, dust and dirty.
Solution:
Replace fan, review cutting conditions, clean parts.

Alarm 10 (AL-10) +15V power voltage is low
Causes:
Drop in input power, momentary power failure.
Solution:
Correct case and reset the alarm.

Alarm 11 (AL-11) Overvoltage of DC Link Circuit
Causes:
High power impedance, PCB or transistor module are defective.
Solution:
Check AC power, replace damaged Fanuc part.

Alarm 12 (AL-12) Overcurrent flows to DC Link Circuit
Causes:
Output terminals or internal motor of the motor is shorted, defective PCB or transistor module.
Solution:
Check connections, replace damaged parts.

Alarm 13 (AL-13) CPU Inter Data Memory Alarm
Replace PCB

Alarm 14 (AL-14) ROM Is Defective
Cause:
ROM is not mounted, not mounted correctly or fault
Solution:
Check EPROM.

Troubleshooting Faults of Fanuc Alpha Servo Drives

fanuc cnc

Troubleshooting Faults of FANUC Alpha Servo Drives

This troubleshooting guide is in reference to Fanuc drives that begin with part number A06B-6079, A06B-6080, and A06B-6096 and is meant to help troubleshoot Fanuc alpha drive faults. If a drive status alarm appears on the 7 segment display, where the “-” refers to drive not ready (Waiting for an Emergency Stop signal to power up) and “0” refers to drive powering up correctly. Any other number or letter on this status display is an alarm code. One of the more common faults is an Alarm 8.i Here are some tips to check to see what the issue may be when an alarm comes up on your drive.

MRO Electric and Supply supplies and repairs a large number of FANUC Servo Drives. To request a quote, please call 800-691-8511 or email sales@mroelectric.com.

1 – Check the link: (A06B-6079 drives only). An A06B-6079 drive can give a fault if the S1 Link is in the wrong position, so check the S1 – JV Connections (Type A Interface) and S2 – JS Connections (Type B Interface). An incorrect setting will cause an Alarm “8”.

2 – Check the wiring: A L motor is wired in the lower terminals and an M motor is wired in the upper terminals, both as U/V/W/E. JV1B connected from the L command plug of the axis card, JV2B from the M command plug. JX1A connected from previous drive, JX1B connected to the next drive in the line. The last drive in the line has a terminator in JX1B. 24v/0v/ESP connected into CX1A from the previous drive, out of CX1B to the next drive in the line.

3 – Disconnect motor cable: Meggar the motor to check the readings.

4 – Power machine on Do this while it is in an emergency stop. The drive is faulty if an alarm occurs, expect a “-” reading.

5 – Release Emergency Stop: Power the machine up after releasing the stop. If an alarm occurs, power the machine off and remove motor wires U/V/W/E (Note – this is dangerous on a vertical axis, brake release, slide drops etc). Release Emergency Stop and power the machine up. The drive is faulty if the alarm occurs, expect “0” reading.

6 – An additional test can be performed for equally sized 6079/6080 amplifiers H201 SVM2-12/12          H301 SVM2-12/12/12 H203 SVM2-20/20          H302 SVM3-12/12/20 (L&M) H206 SVM2-40/40          H303 SVM3-12/20/20 (M&N) H208 SVM2-80/80          H304 SVM3-20/20/20 (L/M&N) The suspect axis can be run from the other amplifier in the drive ie X drives M amplifier, Y drives L amplifier. To do this swap round a – X & Y Motor cables U/V/W/E (at the drive) and b – X & Y Command cables (at the drive) (6096 requires parameters changing to swap X & Y round).

The drive is faulty if the alarm remains the same as before the test. For example Alarm “8” is reported on a 6079-H201 drive using JV connections Steps 1~5 above, have been performed and still alarm “8”. Remove the servo motor wires from the lower terminals and reconnect into the upper terminals, upper into lower. Remove JV1B and insert into JV2B, JV2B into JV1B. Retest the machine.

The drive is faulty if the same alarm occurs, ie alarm “8” The fault lies elsewhere on the machine if another alarm occurs, ie alarm “9”. In this example the drive has detected an overcurrent from the L axis, alarm “8” Swapping the cables over allowed a different amplifier to control the axis. An “8” alarm would remain if the same drive circuitry detected the overcurrent. A “9” would occur if the overcurrent was detected using the other drive circuitry in the amplifier and the fault would be caused externally from the drive.

Fanuc Spindle Alarms for Troubleshooting

fanuc troubleshooting

Alarm # Led Display Content of FANUC SPINDLE Alarms
8 4 2 1

1

o

Motor Overheat

2

o

Speed deviates from commanded speed

3

o

o

Regenerative fault

6

o

o

Excess Motor Speed Analog

7

o

o

o

Excess Motor Speed Digital

8

o

Voltage higher than specified

9

o

o

Radiator for power semiconductor overheat

10

o

o

+15Volt Supply is low

11

o

o

o

DC Link voltage is high

12

o

o

DC Link current is high

13

o

o

o

CPU and peripheral parts are defective

14

o

o

o

ROM is defective

Alarm List for A06B-6044-Hxxx

Alarm List for the following Drives:

Alarm # Led Display Content of Alarms
8 4 2 1

1

o

Motor Overheat

2

o

Speed deviates from commanded speed

3

o

o

Fuse F7in DC link is blown out.

4

o

Fuses F1,F2,F3 for AC input blown out.

5

o

o

Fuses AF2 or AF3 on PCB are blown out.

6

o

o

Excess Motor Speed Analog

7

o

o

o

Excess Motor Speed Digital

8

o

Voltage higher than specified (24v)

9

o

o

Radiator for power semiconductor overheat

10

o

o

+15Volt Supply is low

11

o

o

o

DC Link voltage is high

12

o

o

DC Link current is high

13

o

o

o

CPU and peripheral parts are defective

14

o

o

o

ROM is defective

15

o

o

o

o

Option circuit fault.

Digital AC Spindle Drive

Alarm List for A06B-6055-Hxxx

Alarm List for the following drives:

  • Model 3 thru 22    A06B-6055-Hxxx

 

Alarm Display Alarm Content

AL-01

Motor Overheated

AL-02

Speed deviates from commanded speed

AL-03

Fuse F7in DC link is blown out.

AL-04

Fuses F1,F2,F3 for AC input blown out.

AL-06

Excess Motor Speed Analog

AL-07

Excess Motor Speed Digital

AL-08

Voltage higher than specified (24v)

AL-09

Radiator for power semiconductor overheat

AL-10

+15v power supply is abnormally low

AL-11

DC Link voltage is high

AL-12

DC Link current is high

AL-13

Data memory for CPU abnormal

AL-16

RAM in NVRAM is abnormal

AL-17

ROM in NVRAM is abnormal

AL-18

Check sum alarm of ROM

AL-19

Excessive alarm of U phase current detection circuit offset

AL-20

Excessive alarm of V phase current detection circuit offset

AL-21

Excessive alarm of velocity command circuit offset.

AL-22

Excessive alarm of velocity detection circuit offset.

AL-23

Excessive alarm of ER circuit offset.

AL-14

ROM is abnormal

AL-15

Spindle selection control circuit is abnormal.

Alarm List for A06B-6059-Hxxx

Alarm List for the following drives:

  • Model 1S thru 3S   A06B-6059-Hxxx

 View Fanuc Spindle Amp Alarm Codes for Alpha Series here. 

Alarm # Meaning

AL-01

Motor Overheat

AL-02

Speed deviates from commanded speed

AL-03

24v Fuse is blown. (before PCB edition 09A)

AL-04

AL-05

AL-06

Excess Motor Speed Analog

AL-07

Excess Motor Speed Digital

AL-08

Over voltage

AL-09

Overheat of radiator

AL-10

Low voltage of input power.

AL-11

Excessive high voltage of DC link

AL-12

Abnormal current of DC link

AL-13-15

AL-16-23

Defective arithmetic circuit and peripheral circuit

No indication

Defective ROM

Alarm List for A06B-6059-Hxxx

Alarm List for the following drives:

  • Model 6S-26S    A06B-6059-Hxxx
Alarm # Meaning

AL-01

Motor Overheat

AL-02

Speed deviates from commanded speed

AL-03

24v Fuse is blown. (before PCB edition 09A)

AL-04

Open phase of input power.

AL-05

AL-06

Excess Motor Speed Analog

AL-07

Excess Motor Speed Digital

AL-08

Over voltage

AL-09

Overheat of radiator

AL-10

Low voltage of input power.

AL-11

Excessive high voltage of DC link

AL-12

Abnormal current of DC link

AL-13

Defective arithmetic circuit

AL-14

Defective ROM

AL-15

Defective optional circuit.

AL-16-23

Defective arithmetic circuit and peripheral circuit

No indication

Defective ROM
FANUC Controls Alarms

Fanuc Power Supply Alarm Codes – Alpha Series

fanuc cnc

Fanuc Power Supply Alarm Codes – Alpha Series

Recently we had a customer who was working on troubleshooting a FANUC CNC Power Supply alarm that he had on a machine. He was wondering what the different codes stood for, so we wanted to go ahead and list the different alarm codes for this series. These codes apply to power supplies that start with the following prefixes. The “X”s after the H will be numbered, so an example part number is A06B-6087-H130.

A06B-6081-HXXX
A06B-6083-HXXX
A06B-6077-HXXX
A06B-6091-HXXX
A06B-6120-HXXX
A06B-6140-HXXX
A06B-6110-HXXX

Here is a list of the alarm codes for these series of Power Supply Modules.

AL01: The main circuit power module (IPM) has detected am Error (PSM-5.5,-11)
Overcurrent flows into the input of the main circuit (PSM-15 to –30).

AL02: A cooling fan for the control circuit has stopped.

AL03: The Temperature of the main circuit heat sink has risen abnormally.

AL04: In the main circuit the DC voltage (DC Link) has dropped.

AL05: The main circuit capacitor was not recharged within the specified time.

AL06: The Input Power Supply is abnormal (open phase).

AL07: In the main circuit the DC Voltage at the DC link is abnormally high.

Be sure to check out our article covering FANUC CNC Troubleshooting Frequently Asked Questions here.

A06B-6087-H130 alarm codes

For more information or to get a quote on a FANUC power supply, please call 800-691-8511 or email sales@mroelectric.com.

We also provide repair services for FANUC Power Supplies.

Fanuc 911 RAM PARITY ERROR Troubleshooting

Fanuc 911 Error

Fanuc 911 RAM PARITY ERROR Troubleshooting

MRO Electric and Supply maintains a comprehensive stock of new and used FANUC CNC and FANUC Robots parts. If you need a FANUC replacement part, please call 800-691-8511 or email sales@mroelectric.com.

Last week we had a customer who was running an RNC 16 STAR 1990 vintage machine which failed so he decided to replace the main A16B-1010-0280 motherboard. His original problem was that he was receiving a 401 [VRDY Off] Error which then led to a 911 Error. When he replaced the A16B-1010-0280 motherboard, the machine would go directly to the 911 Error.

The first thing we checked for was to make sure that he transferred over all of the EEPROM modules from his original board to the replacement board, which he did. Since that wasn’t the issue, we double checked on the 911 Error, which shows as a RAM PARITY ERROR in the manual. The main cause of this error is an issue with the memory in the unit, which is caused by the memory board failing or losing the parameters in the system.

To check to see if the memory board was causing it or not, you can turn the control off, reset it, and delete the parameters. If this clears the alarm, the control would come up with a different series of servo alarms meaning that the parameters need to be reloaded. If the Fanuc 911 Error comes back it would mean that there is a problem with the memory board which needs to be replaced. Before trying any of this, be sure to confirm that you have all of the parameters saved so you can load them back in. Check out our article on IT and Robotics here.

Once the 911 Error was cleared, the customer was able to load the parameters back on to get the machine up and running.

Rebuild a Fanuc Motor – Model A06B-0131-B075 Process

Gallery of pictures showing the process that it takes to rebuild a Fanuc motor, part number A06B-0128-B675#7008.

Original pictures of the motor. Fan is dirty, all sides show significant use.

fanuc motor repair
fanuc motor repair

Upon disassembling the FANUC servo motor, the residue was found in the stator prompting the removal of the motor shaft. This would have caused a short in the stator once running.

The finished product, after the motor is rebuilt and fully tested.

rebuild a fanuc motor
fanuc servo motor repair
MRO Electric stocks new and refurbished FANUC CNC Motors. We also provide pre-priced Control Techniques repairs. For more information or to request a quote, please call 800-691-8511 or email sales@mroelectric.com.