Fanuc sv0401 ошибка

 1SV0401 Alarm reason

SV0401, the servo ready signal is disconnected (V READY OFF), common causes:
1. This alarm occurs when the servo amplifier servo ready signal (VRDY) has not been turned on or turned off during operation
2. This alarm is caused by other servo alarm
3. This alarm is caused by a strong electric circuit around the amplifier
4. This alarm is caused by the failure of the servo amplifier, main board and CNC axis card

2SV0401 alarm principle

The red arrow and signal name indicate the command, and the blue arrow and signal name indicate the feedback signal. After the CNC issues the MCON command, if the DRDY signal is not received within a certain period of time, an SV0401 alarm will occur.
3
SV0401 alarm analysis method
No matter what the system is, the first step is to do: if other alarms occur at the same time, first resolve other alarms.
[Key points] No.358 of the diagnostic information (DGN) analyzes the cause of the failure (applicable system: 0i-B/C/D/F/FPlus, 16i/18i/21i-A/B, 31i/32i/35i-A /B and other systems)
Diagnosis 358 is used to analyze the cause of the SV0401 alarm. Convert the displayed value to binary and check bit 5 to bit 14. When the excitation of the servo amplifier is turned on, it is set to 1 in order from the low bit 5 in order. During normal startup, bit 5 to bit 14 are all 1, and diagnosis 358=32737. Confirm from the low-order bit in turn. The first «0» bit is the cause of the SV401 alarm.

#5 HRDY: system monitoring program starts
#6 *ESP: emergency stop signal
#7, #8, #9: MCON signal (NC→servo amplifier→general power supply)
#10 CRDY: General power supply ready signal
#11 RLY: Relay signal (DB relay drive)
#12 INTL: Interlock signal (DB relay release state)
#13 DRDY: Amplifier preparation is over (Amplifier)
#14 SRDY: Amplifier preparation is over (software)
SV0401 alarm, the fault point can be determined according to the value of diagnosis 358:

4SV0401 Alarm Solution Idea
Four common solutions for SV0401 alarm:
1. Is the control power of the universal power supply turned on?
2. Are the universal power supply and each amplifier good?
3. Has the emergency stop been lifted?
4. Is the MCC connected? Measure pins 1 and 3 of the CX3 (MCC) interface and pins 2 and 3 of the CX4 (ESP) interface.

1. Dear Sirs

   Quite often we get error SV0401(Y2) Improper VRDY off.

   This machine has got two slides viz Y1 and Y2 both controlled by Beeta i SV 20 drives each

   Control circuit and supply etc checked for both axes Y1 and Y2 did not find any problem, more so this error is only on Head 2 ie having Y2 axis and after couple of hours, it gets set and error vanishes

   Kindly advice

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2. Re: Fanuc Series 0i MD
   

   we had similar problem. replace old electrolytic capacitors in servo amp with new capacitors

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3. Re: Fanuc Series 0i MD
   

   check the v ready off delay you can manage it easily— — — Updated — — —

   CAUSES
   When the control boots up it sends a signal to each of the servos telling them to turn on. Each drive has to respond to the control in a given amount of time(less than a second) with a V_Ready(Velocity Unit Ready) signal. For each axis that does not respond in the given time the control throws a V_Ready OFF alarm. Possible causes could be a blown fuse or tripped breakers on the drive unit itself.

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4. Re: Fanuc Series 0i MD
   

   Some time its the v signal fall for les then milsec.
   Sometimes it happens because of a loose connection in the wiring.
   Or sometimes there is a problem with a driver.
   Also there is a possibility that because of a amrgensi

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5. Re: Fanuc Series 0i MD
   

   Thanks

   Please tell me how can i change V Ready off delay

   a) There are no loose connections on Drive
   b) We had opened and found one big 68 microfarad electrolytic capacitor on Power PCB, found perfectly alright that means capacitance value is shown as 68 and moreover in diode mode it shows charging discharging as we alter polarity of multimeter probes
   c) Found small electrlytic capacitors on control PCB — found alright as seen by Digital Multimeter

   Despite this we have this error and after leaving it for a while suddenly it gets ok

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6. Re: Fanuc Series 0i MD
   

   Thanks

   Please tell me how can i change V Ready off delay

   a) There are no loose connections on Drive
   b) We had opened and found one big 68 microfarad electrolytic capacitor on Power PCB, found perfectly alright that means capacitance value is shown as 68 microfarad and moreover in diode mode it shows charging discharging as we alter polarity of multimeter probes
   c) Found small electrlytic capacitors on control PCB — found alright as seen by Digital Multimeter

   Despite this we have this error and after leaving it for a while suddenly it gets ok
   Pl confirm which capacitor u had to replace the one one Power PCB or the ones on control PCB ?????

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7. Re: Fanuc Series 0i MD
   

   change ALL capacitors regardless of how they test. you cant test caps with regular DMM, you need to use ESR meter and know what it is supposed to be.
   just change all, and use quality Japanese caps. it is the only way to be sure they are good.

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8. Re: Fanuc Series 0i MD
   

   Originally Posted by fordav11
   

   change ALL capacitors regardless of how they test. you cant test caps with regular DMM, you need to use ESR meter and know what it is supposed to be.
   just change all, and use quality Japanese caps. it is the only way to be sure they are good.

   +1
   Common symptoms of slow caps, once they heat up they start the correct cycling.

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