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IndustryArena Forum > Machine Controllers Software and Solutions > Mazak, Mitsubishi, Mazatrol > Changed drives from MDS-A to MDS-C1 series and get S01-PR 0018 alarm
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  1. #1
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    Jun 2008
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    219

    Changed drives from MDS-A to MDS-C1 series and get S01-PR 0018 alarm

    Hi everybody,
    Long time no see...

    I have a problem starting my second 4-axis Meldas 520AM (1998) system since I changed all drives to MDS-C1.
    I get S01 PR 0018 Alarm and the contactor shut off power to the power supply unit.
    The alarm appears on both my 2-axis servo drives. One blips "F1, 18" and "F2, 18". The other one blips "F3, 18" and "F4, 18".
    The Spindle drive only shows "E7" since it got emergency shut down by the contactor.
    On the control display I get "Servo Alarm S01 PR 0018 X" Note, it only points out the X-axis here. How come?

    Before the swap there was no alarm about any encoder communication problem. I have checked the X-axis encoder cable, changed servo motor/encoder unit to another one. Still the same alarm.

    My old drives were MDS-A-SVJ-10 for X, Y, B axis and MDS-A-SVJ-20 for Z axis. Spindle drive was MDS-B-SP-75. Power unit was MDS-A-CR-75.
    My new drives are MDS-C1-V2 1010 for X, Y axis and MDS-C1-V2-1020 for B, Z axis. Spindle drive is MDS-C1-SP-75. Power unit is MDS-C1-CV-110 + of course an AC line reactor D-AL-11K.
    I use the original servo motors/encoders: HA80NT-E33 for X,Y axis, HA100NT-E33 for Z axis and HA40NT-E33 for B axis.
    They are all equipped with incremental motor end encoders OSE253 (25 000p/rev).

    I have changed following servo parameters before firing up:
    SV025 Mtyp: X,Y=from 0001 to 2201, Z=from 0002 to 2202 B=from 0000 to 2200
    SV036 Ptyp: X,Y,Z,B=from 1500 to 0011
    SV047 EC1: X,Y,Z,B=from 0 to 100

    Since I se "18" flickering on all axis, I tend to think it might be a parameter setting error.
    Is there another parameter that can cause the 0018 alrm?

    Any guidance would be highly appreciated.
    Regards

  2. #2

    Re: Changed drives from MDS-A to MDS-C1 series and get S01-PR 0018 alarm

    alarm 18 is the "initial encoder communication error".
    i bet it's because the mds-c1-v does not support osa/ose253 encoders. neither do mds-b-v. i think the only other drive (apart from mds-a-svj) which does - is the mds-b-svj2. no idea why, i see nothing special about them...

  3. #3
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    Jun 2008
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    219

    Re: Changed drives from MDS-A to MDS-C1 series and get S01-PR 0018 alarm

    Thanks for the valuable information. I think it is weird though. Can anyone confirm, elaborate on why C1-V2 drives does not accept OSE 253 encoders?
    Another odd thing is that the servo monitor states that all encoders are OSA 105 which they obviously are not!
    So now I have to buy OSE 104 or OSE 105 encoders for all axes?
    I hope I can still use my HA-N servo motors though?

  4. #4
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    Nov 2012
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    215

    Re: Changed drives from MDS-A to MDS-C1 series and get S01-PR 0018 alarm

    I am not familiar with your control or your encoders (I have an older M3 machine) but I can give you a few thoughts on encoders in general.... The older Mitsubishi controls actually have some additional tracks. In addition to the normal phase quadrature and index pulse, the encoders have a course U/V/W signals too. These are not used for position feedback to the NC control but, rather, the servo amplifier itself. Specifically, the signals provide the feedback mechanism to properly sequence the windings to energize so that the servo moves. Remember, these are AC servos, not DC, so you need to sequence the coils properly.

    So, why is this (potentially) significant? Well, there is nothing unique about a phase quadrature. It is about as exciting as watching honey pour from a bottle. The only variation here is whether or not there are differential amplifiers, but that is easily enough determined. The CPR is very significant, though. Mitsubishi had a tendency, on older control, to provide model number parameter entry and not CPR entry, so there could be some issues there. But, the other place you could easily have an issue is with wiring. I would find, and check, the wiring pinouts carefully between the two models of encoders you are talking about. It is entirely possible that you are not feeding the amps with the correct signals.

  5. #5

    Re: Changed drives from MDS-A to MDS-C1 series and get S01-PR 0018 alarm

    Quote Originally Posted by CNC Viking View Post
    Can anyone confirm, elaborate on why C1-V2 drives does not accept OSE 253 encoders?
    marketing probably? i don't have any mds-c1-v drive to confirm, but mds-b-v still support lower resolution quadrature OHE5K. OSA/OSE are serial interfaced, same protocol. not sure about early ones, but later OSA/OSE/253/104/105 are actually using the same hardware/firmware and can be reprogrammed to be either of those. i.e. OSE253S always reports absolute 20bit position just like OSA105, the only difference between them is the encoder ID...

    e.g. here's the definite list of encoders supported by the mds-b-v fw version BND-513W000 A6, both motor and load-side:
    OHE25K
    OHA25K
    OSE5K
    OHE25KET
    OHA25KET
    OSA105
    OSA104
    OSE105
    OSE104
    OAM-13B
    OSA105ET
    OSA104ET
    OSE105ET
    OSE104ET
    AT342

    Quote Originally Posted by CNC Viking View Post
    Another odd thing is that the servo monitor states that all encoders are OSA 105 which they obviously are not!
    i think can explain that. the drive negotiates with the encoder asking its ID, and when it doesn't recognize it - it load the default one, which is the OSA105

    Quote Originally Posted by CNC Viking View Post
    So now I have to buy OSE 104 or OSE 105 encoders for all axes?
    I hope I can still use my HA-N servo motors though?
    yes, that should help. HA motors are still supported by mds-c1-v according to the manual.

    or take the cover off the encoder and post a photo of the PCB. i can probably tell if it's reprogrammable. i have a HA23-NC motor with OSE104S encoder which happily works as OSA105...

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