dariusz,
ok when i was posting earlier today i could not view that schematic on my phone, screen too small :o/.
i am at home now and did get a chance to look at it.
You said earlier you are only getting 3v at the directional coils? and then when you select a direction it drops to 0v?
Well that doesn't sound right, those coils should be operating at 24 volts. Most of these systems have battery volts supplied to the contactors (in this case i believe it might only be 24v because of the 24v fuse in the module above the motor speed controller in the diagram), and then the neg circuit is gated through the controller to energise the contactor.
If you are only getting 3v at the coils then i would check all the control fuses to start with.
Also when you try to drive the unit check the controller and see if it is flashing any codes. It has an LED indicator on it and if any faults occur this LED will flash. If it is this is a sevcon controller so figuring out what the code is shouldn't be that hard. First turn on the unit and see what the status light is doing, if it is on solid, try to drive the unit and look at it then. Sometimes they might not pick up the fault until it is active.

You also want to go to the main contactor panel and check the main buss fuses, there is the 275A fuse that is inline with the motors power circuits, make sure it is not blown or burnt.

I am going to see if i can find this schematic but if you get a chance can you post the whole diagram like you did with that earlier one you posted? If i have a complete view of the circuits it might help to better understand what else is interacting with that unit. If not thats ok.

for now just check those fuses and the controller LED light for flashing codes.

I'll check the batteries in accordance with your suggestion on Monday.

As far as security is checked all incoming signals to the module SEVCON. Work correctly. Also checked the force sensor with a basket. Working properly - when the sensor is active - the green light goes off in the control, in a basket lift.

Do you know how can I check the same engine?
Nor do I know what kind of element - in the diagram on the right side of the engine - the connectors 164 and 57.

Ok thats good
50v does sound like they are charged well.
As for the load drop test you can hook your VOM across the battery circuit and run the hydrauics till the stroke on the function you use bottoms out, hold it for about 20 seconds and see what the meter drops to. If it drops more than 10% of the starting static voltage then you know there is a problem. Since you have already had these batteries checked and serviced or replaced you probably will not see an extreme drop.
One other thing i thought to check is the level sensor, even if the unit is on level ground if that sensor goes bad it will keep the machine from moving.
You can look on the bottom of it and there should be a power light lit, you can then grab it and tilt it and check it. If it is working the light on the bottom will change and an alarm should sound off. If this does not happen then the sensor may be faulty.

Batteries are recycled in a professional company dealing with only that.
During the tests, it turned out that one of the battery is damaged (during load tests) and was replaced with a new
I'm 99% sure that the batteries are working

How do you recommend to carry out a self-test?

The total battery voltage is now over 50V.
In addition to the ride, all other operations are working - hydraulic unit is working properly.

I was going to suggest pulling a load drop test on each battery and see if you have any dropping low enough to affect the voltage enough to cause this.

The reason i ask is your symptom does sound alot like dead or faulty battery(s)

How do the other functions work?

The batteries were recycled a few days ago.
All have an efficiency of over 50%, and are fully charged.

Before we go any farther have you checked the batteries?
Are they fully charged or close to full?

Thank you for your reply.

At the moment the lift works as follows:
- If you try to drive (forward and back as well) unlocks engine brake
- Large relay coil stopped freaking out
- Lift does not move

I checked the voltage and the resistance of the circuit diagram.
tel-kom.eu/predkosc_amz.png
Ohm on the motor M1 = 0.0 Ohm
The voltages V1 and V2 <3VDC and drops to zero within 2 seconds (checked when you try to forward and reverse)

What sequentially check?

check your fwd and reverse proportional valve coils and wiring in fwd/rev circuit.
sounds like you have a shorted condition kicking the relays out.

might also want to check the brake release circuit and make sure the brake is releasing when a direction is selected and travel is commanded on, the brake should release, if it is not then it may be causing a drag overloading the drive circuit.