In your case, not the amperometers but the physical limiters hidden under the cap....
The LT50 NHK has "automatic" limiters, i.e. two buttons. One is responsible for the up position and the other for the down position. Both must be pressed (they should remain pressed) for the engine to start.
When the motor reaches the upper position, press one of the two buttons (which, depending on how the roller shutter is mounted and which side it is on), it should spring back. Then lower the blind and do the same with the other one - it should also snap off.
Caution: A ring located in the motor on the cable side is responsible for switching off in the end positions. The motor drive ring is on the opposite end of the motor.
In order for everything to work correctly, the rings must be connected by a winding tube so that they work together.
Regards.
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