Hymer Step Switch .. How much !!! gulp

Discussion in 'Hymer' started by scotjimland, Apr 21, 2015.

  1. scotjimland

    scotjimland Funster Life Member

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  2. Terry

    Terry Funster

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    Sounding more like a Yorkshireman every day Jim only it should be arrr much:D
    terry
     
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  3. makems

    makems Funster Life Member

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    Someone once told me that a Yorkshireman is a Scotsman with his sense of generosity removed. :imoutahere:
     
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  4. Ivory55

    Ivory55 Funster

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    I will have to delete any bad posts about your van as I think I have sold Jill the idea of the 644, haha. Hope you get it sorted ok
     
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  5. scotjimland

    scotjimland Funster Life Member

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    Just for info. Omnistore Electric Step.

    wiring drawing .. and fault finding


    [​IMG]

    The control switch is a DOUBLE CHANGE OVER SWITCH. (Not a double pole change over as this is subtly different) This switch contains two change over switches, one switch changes over when the rocker is operated in one direction and the other switch changes over when the rocker is operated in the other direction. So it carries out a few more functions than just a simple ON/OFF switch.

    The Omnistep has a permanent magnet motor. This means that if you reverse the polarity the motor will run in the opposite direction. The switch is designed to do this. The motor rotates in one direction to extend and the other direction to retract.

    Nominally 5 amps is the expected working current for the motor. If however you keep your finger on the switch after the step has fully extended or retracted then the motor will stall. Under this condition the current will increase to a significantly higher figure. Sometimes referred to as the “blocking current”.

    The Omnistep has two electrical components, the motor which moves the step and a switch that is OPEN only when the step is fully retracted. At all other times the switch will be closed.

    Firstly the system is designed to retract the step and sound the alarm should you start your engine with the step extended.

    Under this condition the control switch is as shown in switch picture A. Battery negative is connected to terminal 4 of the switch and comes back out of the switch at terminal 5. It is connected to the right hand end of the motor with a RDGN wire.

    When the engine is running the FRIDGE relay is energised from the vehicle alternator D+ terminal. The fridge relay applies 12 volts to both the fridge and also the step relay terminal 86 (coil+) and one side of the alarm.

    If the step is extended then the step switch will be closed. This will provide a negative supply to the alarm causing it to sound, and also the other end of the relay coil (85) causing it to energise.. Now that the relay is energised the fridge supply which is also connected to the relay terminal 87 is routed by the closed contacts to relay terminal 30 and provides a positive supply to the Omnistep motor. The motor will rotate causing the step to retract. When fully retracted the step switch will open, the relay will release, the alarm will go silent.

    With the engine turned OFF the rocker switch can be depressed causing the step to extend.

    Under this condition the control switch is as shown in switch picture C. Battery negative is connected to terminal 4 of the switch and comes back out of the switch at terminal 1. It is connected to the relay terminal 87a (normally closed contact) and comes out of the relay at terminal 30. From here it is routed to the left hand end of the motor.

    A positive supply from the leisure battery enters the switch at terminal 3 via a BNGN wire. This positive supply leaves the switch at terminal 5 which is routed via a RDGN wire to the right hand end of the motor causing the step to extend. When the step has extended you must leave go of the switch or the current will increase to 14 amps!

    With the engine turned OFF the rocker switch can be depressed causing the step to retract.

    Under this condition the control switch is as shown in switch picture B. Battery negative is connected to terminal 4 of the switch and comes back out of the switch at terminal 5. It is routed to the right hand end of the motor.

    A positive supply from the leisure battery enters the switch at terminal 3 via a BNGN wire. This positive supply leaves the switch at terminal 1. It is connected to the relay terminal 87a (normally closed contact) and comes out of the relay at terminal 30. From here it is routed to the left hand end of the motor causing the step to retract. When the step has retracted you must leave go of the switch or the current will increase to about 14 amps!
     
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  6. steviebouy

    steviebouy Funster

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  7. scotjimland

    scotjimland Funster Life Member

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    Hi Steve .. thanks..

    it 'looks' like the same unit but it's not.. it is simply a two position rocker switch..
    The Hymer switch has a PCB on the back with two relays.. see above drawing

    dealer is supply me one FOC
     
  8. denisejoe

    denisejoe Funster Life Member

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    Good for Becks! We found them to be fantastic when we bought our van from them and had a problem 2 weeks before the end of the year's warranty! Needed a new wiring loom at a cost of £650 - just glad we didn't have to pay for it.

    Would have bought another van from them if they'd had what we wanted when we changed but unfortunately they didn't.

    Denise
     
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  9. andy63

    andy63 Funster

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    Hi @ScotJimland I have a slide out step that is wired in the fashion described in your post above.. ie a permanent magnet motor that is rs versed by a rocker type switch....
    Can you tell me if all steps work on the same principle or can it be achieved in a different manner... before I read your post was going to try and look into this ,now I'm hoping you might save me the googling. .
    Ta Andy.
     
  10. scotjimland

    scotjimland Funster Life Member

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    Can't say for sure Andy .. but I imagine they would do..
     
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  11. andy63

    andy63 Funster

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    Thanks Jim, I'll have a look into it sometime..
    A request from someone to look at their step and seem to remember reading somewhere about steps with timer function or cut outs which seemed to indicate a motor running one way but with cut outs at the appropriate point and then switched again to retract.
    Thanks ...andy
     
  12. scotjimland

    scotjimland Funster Life Member

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    that may be the case on some steps.. the ones on my RV were different.. the operated with the door opening and closing and also had a switch to park them either down or up

    The Hymer system there is no limit switches, the step operates while the switch is held up or down, .. if you keep pressing the button when it reaches the extent of travel, the current go's up to 14 A ..
     
    Last edited: Apr 22, 2015
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  13. Forestboy

    Forestboy Funster Life Member

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    My switch works fine but my buzzer started getting a bit intermittent and has now stopped altogether.
    Not sure I'll have time to check it before we head off to Italy just have to double check each time.
    If anything goes wrong it'll be Jans fault as the step is her responsibility.
    Haha dont reckon I'll get away with that.:):)
     
  14. Techno

    Techno Funster Life Member

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    A lot of effort in that post Jim! Could do with that in resources section
     
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  15. scotjimland

    scotjimland Funster Life Member

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    I would think that is the step switch that is dirty/sticky or corroded connections.

    .. clean a spray with WD40 should sort it..
     
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  16. JeanLuc

    JeanLuc Funster

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    Sometimes the buzzer 'drops off' its mounting point and then becomes inaudible. Perhaps Forestboy's is 'hanging by a thread'? Search for an earlier post regarding this issue if you want to research it a bit more - I have written about it before but cannot stop now to find the post.
     
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  17. JeanLuc

    JeanLuc Funster

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    This was the recent post I made but it refers to a Sprinter-based Hymer. On Fiat-based ones, I'm not sure where the buzzer is located but suspect it is near the Elektroblock.
    Step issues.
     
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  18. scotjimland

    scotjimland Funster Life Member

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    Replacement switch from Becks arrived this morning.. now fitted and step working correctly :)

    thanks Becks(y)
     
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  19. marcus153

    marcus153

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    On my Hymer a new switch for the habitation step has been installed (next to AC switch). But the normal switch has been disabled but is still there. Not sure why this has been done but can the original switch be restored?
     
  20. hilldweller

    hilldweller Funster Life Member

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    Lots of arcing on that switch, I'd fit a suppressor across the motor to protect the relay and switch.
     
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