Author Topic: Request for solution in Fanuc Robot S420-iw for SRVO-046 OVC Alarm  (Read 2034 times)

Offline hari

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Respected to all i am a engineer working in die casting company.In my company we are using Fanuc Robot S-420iW series for metal handling purpose.Now we got a error in J1 axis i.e  SRVO-046 OVC Alarm,due to this alarm we are not able to run the robot in manual or auto mode.So plz guys suggest me what i need to do.Thanks in advance.

Online Sergei Troizky

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Re: Request for solution in Fanuc Robot S420-iw for SRVO-046 OVC Alarm
« Reply #1 on: October 09, 2012, 05:17:33 PM »
The error indicates cumulative (not momentary) motor overload.

R-30iA Controller Software Error Code Manual 3.16.9.46.
SRVO-046 OVC alarm (Group:%d Axis:%d)
Cause: The root-mean-square current value which is calculated internally by the servo system exceeds the
maximum permissible value. This alarm is issued to protect the motor and amplifier from damage of thermal
destruction. Probable cause:
1. Overload
2. External force to the robot
3. Disconnection of the brake cable
4. Insufficient torque by low voltage of power supply
5. Brake failure (includes mis-setting of brake number for auxiliary axis)
6. Aux. brake unit failure for aux. axis
7. Amplifier failure
8. Motor failure
9. Motor power cable or brake cable failure
Remedy:
1. Check whether the duty and applied load exceed the rating. If so, reduce the duty or applied load.
2. Check whether the robot is pushed or pulled by external force. If so, remove the external force to the robot
or modify the taught point.
3. Check whether the brake cable/connector are connected correctly.
4. Measure the supplied voltage. Then, check whether the voltage is matched to the controller specification.
5. Check whether the motor brake is released properly when Reset or the robot moves. First of all, check
whether the setting of brake number is correct when this alarm occurs on auxiliary axis.
6. When this alarm occurs on the auxiliary axis which brake is controlled by the aux. brake unit, check the
fuse on the aux. brake unit.
7. If this alarm cannot be reset, the troubles of related parts are thought. Refer to the Controller Maintenance
Manual for more information. About auxiliary axis, refer to the Auxiliary Axis Option Maintenance Manual.

Offline hari

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Re: Request for solution in Fanuc Robot S420-iw for SRVO-046 OVC Alarm
« Reply #2 on: October 09, 2012, 05:39:14 PM »
Sergei Troizky thanks for replying but i am using R-2j controller and i was also checked all thinks which you given but i could not get any solution from them.those are working properly but why it is happen that i don't know.  :help:   

Offline cunaf

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Re: Request for solution in Fanuc Robot S420-iw for SRVO-046 OVC Alarm
« Reply #3 on: October 09, 2012, 09:02:07 PM »
Are there any other alarms occuring simultaneously with this alarm?  To check press Menus-->Alarms and view ALL active alarms.  Troubleshooting will depend on this info.
If it is only OVC for J1:  Does the OVC alarm occur as soon as the deadman switch is pulled in?  Try tuning on TP, go to joint coord, put speed to 5%, pull in deadman to get servo power, then tap J6 jog keys (Or any other axis than J1), Listen and feel the brake on J1 while doing this.  If the alarm does not occur the issue is likely the J1 servo.  If it does occur the issue is possibly cables like connection but more than likely internal harness.

Offline TRBe

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Re: Request for solution in Fanuc Robot S420-iw for SRVO-046 OVC Alarm
« Reply #4 on: October 10, 2012, 07:26:38 AM »
This is what I found.

046 SVAL2 "OVC alarm (Group:%d Axis:%d)"
[Cause]
The average current calculated by the
servo software exceeded specification.
[Remedy]
Make sure the robot is not loaded
beyond specification.
Check input power to the servo
amplifier.  It should be greater
than 170 VAC phase-to-phase.
Replace SIF module on the
axis control pcb.

Offline hari

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Re: Request for solution in Fanuc Robot S420-iw for SRVO-046 OVC Alarm
« Reply #5 on: October 10, 2012, 03:36:47 PM »
Hey Mr.cunaf in some time simultaneously i got similar errors i.e
1.SRVO–023 SERVO Stop error excess(G:%d A:%d)
2.SRVO–024 SERVO Move error excess(G:%d A:%d)
but i was checked the motor power cable and brake cable these are fine.But i have so confuse of this alarm. Can you guide me without service person can i open the motor from robot assemble. If open is there any series issues.Plz give me guide any one. :help: 
 

Offline cunaf

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Re: Request for solution in Fanuc Robot S420-iw for SRVO-046 OVC Alarm
« Reply #6 on: October 10, 2012, 05:27:29 PM »
If you are Joint coordinates and jog axis 2,3,4,5 or 6 do you still get the alarm on axis 1? 

Offline swapnil

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Re: Request for solution in Fanuc Robot S420-iw for SRVO-046 OVC Alarm
« Reply #7 on: October 10, 2012, 05:53:11 PM »
We had the same problem at our RJ3 System, you can reset this problem by below procedure...

1. Go to...System Variable...$MCR
2. Then, reset Axis BZAL ALRAM by $SPC RESET= make it TRUE to FALSE (Check Vice versa)

Then,Switch off & on the panel.

Then, you can move robot by this.

then reset SPC_PCA Alarm & Remaster that Axis.


Note- 1.While you are doing this SPC_RESET to TRUE to FALSE (o to 1)... it will be just flick for a moment, you need to make it TRUE to
            FALSE (o to 1) & Then,Switch off & on.
         2. By this you can move your robot only,but,check for what was happened in actual for the Axis? ***As in our case the motor
             Pulsecoder connector was broken.

***Make sure to you need to Reteach the all programme(s) of this robot.
« Last Edit: October 10, 2012, 06:20:38 PM by swapnil »
All power is within you; you can do anything and everything. Believe in that; do not believe that you are weak; do not believe that you are half-crazy lunatic, as most of us believe now-a-days. You can do anything and everything, without even the guidance of any one. All power is there. Stand up and express the divinity within you--Swami Vivekananda

Offline swapnil

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Re: Request for solution in Fanuc Robot S420-iw for SRVO-046 OVC Alarm
« Reply #8 on: October 10, 2012, 06:25:00 PM »
If you are Joint coordinates and jog axis 2,3,4,5 or 6 do you still get the alarm on axis 1? 

Yes, there is possibility to alram on only to that single axis for the reason(s)... i.e. Pulsecoder cable/cable connector or its connection broken.
« Last Edit: October 10, 2012, 06:27:17 PM by swapnil »
All power is within you; you can do anything and everything. Believe in that; do not believe that you are weak; do not believe that you are half-crazy lunatic, as most of us believe now-a-days. You can do anything and everything, without even the guidance of any one. All power is there. Stand up and express the divinity within you--Swami Vivekananda

Offline hari

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Re: Request for solution in Fanuc Robot S420-iw for SRVO-046 OVC Alarm
« Reply #9 on: October 11, 2012, 02:05:47 PM »
Thanks Mr.Swapnil But while jogging the other axis(2,3,4,5,6) i didn't get these alarms aut only in J1 axis moving time only i get.  After that i was checked the power cable and brake cable those working fine. i was not touch the pulse coder.B'cos if i remove the pulse coder may be i need to mastering the axises and also i need reprogram all.
Is there any better solution for solving the problem. :help: :wallbash:

Offline swapnil

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Re: Request for solution in Fanuc Robot S420-iw for SRVO-046 OVC Alarm
« Reply #10 on: October 11, 2012, 02:42:39 PM »
Thanks Mr.Swapnil But while jogging the other axis(2,3,4,5,6) i didn't get these alarms aut only in J1 axis moving time only i get.  After that i was checked the power cable and brake cable those working fine. i was not touch the pulse coder.B'cos if i remove the pulse coder may be i need to mastering the axises and also i need reprogram all.
Is there any better solution for solving the problem. :help: :wallbash:

welcome Mr.Hari...in our case there was a problem only to that axis i.e.J2 & same, we cant operate any axes due to it,so,we just tried this procedure & remastered robot & programme teached manually.
may be...by mistake of someone of manually removed that cable connector or in auto cycle that pulsecoder connection was cut,so this kind of problem is came.***Confirm it.

...is there have you talked with FANUC ?
« Last Edit: October 11, 2012, 02:45:28 PM by swapnil »
All power is within you; you can do anything and everything. Believe in that; do not believe that you are weak; do not believe that you are half-crazy lunatic, as most of us believe now-a-days. You can do anything and everything, without even the guidance of any one. All power is there. Stand up and express the divinity within you--Swami Vivekananda

Offline Doctor_C

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Re: Request for solution in Fanuc Robot S420-iw for SRVO-046 OVC Alarm
« Reply #11 on: October 12, 2012, 12:42:48 PM »
Have you checked the mechanical?  Jog the robot and listen to Axis 1 (the old screwdriver stethoscope works pretty good). Do you do your own PMs? If you do try pumping some grease out and check it on a clean cloth - look for metal filings and if the grease is extremely black. Both of these are indicators of extreme duty/wear.

The Stop error and the move error both tell me to look for mechanical.

Offline swapnil

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Re: Request for solution in Fanuc Robot S420-iw for SRVO-046 OVC Alarm
« Reply #12 on: October 12, 2012, 04:22:37 PM »
FYI,
Pl. go thru attached image.
All power is within you; you can do anything and everything. Believe in that; do not believe that you are weak; do not believe that you are half-crazy lunatic, as most of us believe now-a-days. You can do anything and everything, without even the guidance of any one. All power is there. Stand up and express the divinity within you--Swami Vivekananda

Offline oakleyas

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Re: Request for solution in Fanuc Robot S420-iw for SRVO-046 OVC Alarm
« Reply #13 on: October 12, 2012, 04:54:31 PM »
I have to agree with Doctor_C. Also try releasing the brake on J1 only and try to move the robot by hand.
You should be able to feel if it is binding or not.

Offline cunaf

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Re: Request for solution in Fanuc Robot S420-iw for SRVO-046 OVC Alarm
« Reply #14 on: October 12, 2012, 05:30:20 PM »
You may also remove the 4 bolts holding in the servo and pull from the reducer.  Leave the cables connected.  Now try driving J1 in joint and watch the shaft movement.  If you still have the alarm it's likely the servo.  (You said you checked the cables already).