What Is Ovc Alarm In Fanuc Robot

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  1. Ovc Alarm On Fanuc Robot
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Free image capture software download. The OVC alarm is issued based on this estimated temperature.2 Relationship between the OVC and OVL alarms NOTE The relationship shown in Fig. The OVC alarm is used for protection from a short-time overcurrent.

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Ovc Alarm On Fanuc Robot

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  1. lowCountryCamo
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    Overcurrent alarm on servo Power supply Fanuc OMD

    My great deal is fast becoming only a fair deal. Now I am getting random (but becoming more often) 409 sp1-30, 414, 424,434 alarms. Dignostic 720 - 723 all say OVC. The overcurrent alarm only happen when the main contactor engages. If I don't get the alarm at boot up, it runs fine. Most of the threads I have found are getting this alarm while spindle is running. I ran spindle to top for 10min yesterday and got nothing.
    I get a al-30 on the spindle amp and al-01 on the power supply module. No alarm numbers on the xyz servo amps. The servo maintenance manual says if you have 30 on spindle amp and 01 on PSM, concentrate on the PSM. And that causes are either imbalance on the mains, wrong ac reactor, or problem IGBT transistor. My phase converter voltage is 218,219,221. Amps are not so balanced. The unusual thing is the check of IR and IS current on the PSM check pins show very little current, even when the contactor engages and the alarms sound.
    The 24V and 5V pins show to within range. All the fans are running. I will take the PSM apart to have a look. Could wrong Phase rotation cause this problem? Any other insight? Thanks again.
  2. Hot Rolled
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    What brand of RPC is it? I only ask because some are not CNC compatible and guys have had problems with controls and drives. As for phase rotation is the coolet pump going the correct way when turned on/pumping? Is the carousel umbrella motor going the correct way when you hit the button to rotate, to go clockwise or counter clockwise? Is the Spindle going the correct way? If all of these are going the correct way I would say the phase rotation is correct.
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    Since the alarms you are getting are for both spindle and servo, I'm thinking power problems. Another good check for phase rotation is hydraulic pressure (if equipped with a hydraulic system). Way lube pump motor is often 3 phase and a good one to check. Spindle is not useful to check phase rotation. The drive will run the motor the correct direction regardless of incoming phase rotation.
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    Thanks Vancbiker I wasn't sure about the spindle. I think your right about incoming power problem. I know the motor that moves the umbrella over to the spindle for a tool change is another one but his is not working at this time.
    Originally Posted by Vancbiker
    Spindle is not useful to check phase rotation. The drive will run the motor the correct direction regardless of incoming phase rotation.
  5. lowCountryCamo
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    Came right on tonight. Checked coolant pump and running in correct direction. One thing I found is that I am getting 8V higher per phase (226) at the PSM main 3 phase than I read at the main lugs (218)before the ac reactor and mag contactor. While at idle I read .02 amps on R, .2 amps on S and T. Will run spindle and see what happens.
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    As I ran the spindle the voltage leveled out from the power supply and main lugs. At full spindle speed the amps were 6.5 (R), 7 (S), 3.5 (T). Don't know if T being half the others is any problem. Couple days ago when I was getting the alarms it rained hard and I still am having moisture (machine condensation). Could that be an issue? Hate to open up the servos if not needed.
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    I still think their maybe RPC problems even though its working now. Moisture and CNC controls do not play well together at all. What kind of moisture are you talking about? If you open the electrical cab is it damp inside? If so get a fan or heater with fan pointed inside to dry it out. Is your shop heated? Is the RPC inside or out side?
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    RPC is inside. Machines are wet when it rains. I added on when moving the vmc in and have not finished insulating. Doing that over the next couple nights. I did not see where the cabinet is wet inside but it is damn sure wet outside.
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    Place a 40 to 75 Watt incandescent bulb in the electronics cabinet and leave it powered until you get your insulation installed and temperature stabilized. The rise above ambient created by the bulb will keep any condensation from forming in the cabinet.
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  11. lowCountryCamo
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    As for checking phase rotation with a tool changer would ccw and cw be from the perspective of looking down or up?
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    Hi CW on mine the umbrella move towards me if I stand in front of the machine but I just looked and the motor on mine is 115 volt so that will not tell you phase rotation. The motor that moves the umbrella over to the spindle is 3 phase on mine and that will tell you phase rotation but yours is not working yet. Sorry I may steered you wrong about direction of umbrella telling you phase rotation because it maybe 1 phase like mine.
    Last edited by twr; 12-28-2014 at 08:29 AM.
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    The ONLY thing 'CNC' about an RPC is the way it is tuned. IMO, all of them should be tuned better. Once you see what happens to a motor with voltage imbalance, you will want to see it CLOSE. As well, you will notice that voltage not stay balanced with load. You may need to tune it to a sweet spot of load for your machine. learn about it. Very simple.
    A 3p rotation meter is dirt cheap from China and works. fire RPC and verify rotation BEFORE turning machine on several times. They are a must for anyone with 3P IMO.
    Condensate in a control cab???!!! You are about to learn the expensive way! If you can touch anything in there and get moisture on your finger, do NOT run it. I left a cab open one night after repairing and fired the next day and Z took off, errored out, blew a fuse, etc. board were dripping! Put fan and light in there and learned to keep the thing sealed up and that was years ago.
    One of the great things with control air conditioners is they also dry the air for you. guaranteed, they extend the life of controls. Heat and electrics don't like each other.
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