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Before I get on to the manufacturers wonder if anyone has got a circuit diagram of the Calira EVS 38/20-DS/IU power supply unit.
I have the block diagram and installation and operating instructions.
At the moment the leisure and main batteries stay connected together at anything above 13.2 Volts even when the engine is switched off.
I want to change this to nearer 13.5 Volts. There are pots in the main unit but nothing to say which one does what.
I have several items (satellite being one) that will not operate until the charging circuit disconnects the two batteries ( igniton active error showing) and sometimes it can take 20-30 minutes for the volts to drop, unless I force the fridge into battery mode manually to load up the main battery. Usually I then forget to put the fridge back into automatic and end up with warm ice cream.
Also want to make the LED bargraph display what is actually at the battery terminals as opposed to what is on the wires at the control board end. The bargraph reads 0.2 volts low at present. This may be easier to do as there are only two pots on the control unit but always nice to know which one is the right one.
Turns out Calira do not supply circuit diagrams except (maybe) to trade members.
However have gleaned some information from them and now realise that there is no charge control signal wire from the alternator to the EVS unit.
So now in the process of running a wire from the alternator to the EVS and hopefully this will instantly disconnect the parallel charging of the batteries when I stop the engine. Whether it will overide the automatic function which disconnects at 13.2 Volts I will have to wait and see..
Just got to figure the bargraph display now but think the display is not adjustable except by changing zener diodes. Can live with the miss reading in that case.
Martin.
Have now added a wire from the alternator to the +D (pin 1 terminal and still have the same problem with the starter and leisure batteries staying connected until the volts drop below 13.2 Volts.
Had the main unit apart and there are no 'user adjustable' parts, circuit is difficult to trace, and I don't want the unit out of the van for extended periods. Probably a zener or potential divider does the job.
There are two 'user adjustments' on the control panel, one does the bargraph display for battery volts (which is very inaccurate) but not sure what the other one does so will be tracing the circuit when I have time.
Have added a mod to disconnect battery three when the engine stops. This battery is Sat TV and other radio only, leaving the standard leisure battery for lights, pump etc.
Have sent another E-mail to Calira asking for technical help, the last one just said take the unit to your dealer who will check it. I know they would not have a clue except to change it (maybe).
Still I suppose I should not complain, at least all batteries are being charged both on EHU and from the alternator unlike some.
Martin.
you seem to know your way around this system so I was wondering if you could help me. I have the same system but now only half of my electrics work and I can't find out why. The circuit is broken down into two parts and it is the line 1 with some lights and the fridge that is not working on mine.
Hi Neil,
Well starting with the obvious, is the control panel furthest right switch on. This controls Fridge and some lights, there should be an LED lit immediately above the switch when it is on. Control panel is a Calira bord control 723 in my case.
Next check the fuses on the top of the main EVS 38/20 unit. They are marked Fridge (20A) is left and the two lighting fuses (15A) are on the right.
If the above are on and ok, then next check voltages on the bottom six pin plug (A03). Pin 1 & 2 are positive, 3 & 4 are negative. You should see volts on this plug when the engine is running or you are on EHU, Engine off no volts.
Lighting circuit is a bit more complicated, but on my van the colours are Orange (positive) White (negative) so check on on plugs A01 and A02.
As you have partial working I suspect that one of the relays or drivers inside the EVS may be faulty. Not a definate way to check but when you turn on the power switch on the control unit (As first idea above) you should hear a click from inside the EVS. Unfortunately there are two relays (circuit 1 and 2) so difficult to be certain which relay is moving.
For most of the checks above and also a very useful accessory you will need a multimeter to check voltage (DC) and continuity (Ohms), if you do not have one they are available from the likes of Maplins and many other places.
Also if you need a copy of the operating instructions I have one in PDF format, unfortunately no circuit diagram yet (but living in hope).
I wonder if the diode that should stop the service battery feeding back is failed because total feed back is not a good idea and if the composite block of batteries have to decay to a lower voltage before switch-over takes place suggests that a new diode is the answer or check the one inside if you can do it.
Well to keep the tread going, I was promised that Calira would E-mail a circuit diagram, but several months later still no sign of anything. Even been looking in the junk mail system and nothing there either.
So still having problems.
As it's been bl**dy cold not bothered doing more checks but may start again soon.
Dikyenfo, no diodes in the circuit, seem to be either MOSFETS or IGFETS, but again will have to look when I get started again.
Charging is fine, getting the batteries to seperate is still a bit of a pain, but as most times we end up on hookup it's not too much of a problem.
Hi,
I have a Knaus Sun Ti 650 ME with a Calira EVS 30/20-DS/IU charger.
There are only a small number of usage hours on it.
When I connect to the 230v mains only the green Led for The main battery lights up and the second green light for the Leisure battery is OFF.
I can see that there is no charging of the leisure battery.
I see the Calira site is not yet presented in English. Any suggestions as to where I might find the fault.
If a circuit diagram is available I could fault find it and record my findings?
All help welcome!
Liamog
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France
terminal and still have the same problem with the starter and leisure batteries staying connected until the volts drop below 13.2 Volts.
