Adjustment for Material Level Sensor Switch

Working Principle and Sensitivity Adjustment for Rotary Material Level Sensor Switch

Rotary material level sensor switch adopts low-speed motor to drive blades rotating. Once material rise to the position parallel to blades, blades would be blocked and stop rotating. And the signal of material height of position would be sent to machine through the contact point of controls output open (ON) or close (OFF), which lead to cut off the motor power to stop turning; under the spring force, when material drops away from blades, blades restore normal position and motor proceeds to detect material position changes. A circle finishes like this.

According to different density of material, adjustment of spring tension can realize a reliable test: turn spring to the maximum force (left) if material proportion is bigger; then turn spring to the minimum force (right) if the proportion is smaller. See the picture below:

Picture: Sensitivity adjustment

Working Principle and Adjustment for Capacitive Material Level Sensor Switch

Capacitive proximity switch includes one sensor pole and one masking pole, both of which constitute a capacitor. When tested objects (metallic and non-metallic) approach the sense surface, capacitance of capacitor would change. For example, capacitance of RC oscillating circuit increases as tested objects get close. Capacity increasing of capacitor makes the oscillator vibrates, then through the post-stage circuit, signals of oscillation stop and vibration would be converted as switch signals. Therefore, the purpose of detecting objects’ existence can be realized.

Currently used capacitive material sensor switch in Shini is German IFM brand, the adjusting method is shown below:

Picture: Adjusting

Capacitive material sensor switch is adjusted by adopting basic demonstration empty state to inhibit the output of material tank signal. Adjusting demonstration empty state lead to switch reset and delete last regulation of adjusting demonstration. To prevent unmeant settings, the switch can be electronically locked.

Demonstration empty state refers to sensor identification to current state with container not loading materials. Once the recognition comes out successfully, it can learn and memorize this state.

Normally open equipment (Output shuts after material tank is fully loaded), press "Out off" for two seconds. (Up to 6 seconds) After that, LED twinkles slowly. Release button and LED goes out.

Normally close equipment (Output opens after material tank is fully loaded), press "Out on" for two seconds. (Up to 6 seconds) After that, LED twinkles slowly. Release button and LED goes light.

Lock-in: press programming key "Out off" and "Out on" for 15 seconds, material level sensor switch turns into the lock-in state.
Unlock: repeat operations above and unlock material level sensor switch.

Example: adjustment method for SGB hopper and mixing barrel capacitive switch

1) If material level stays below material level sensor switch, observe the switch tail indicator, normally it should be bright. If not, it shows that material level sensor switch is not adjusted. Then press "Out on" programming key for 6 seconds to complete adjustment.

2) If material level reaches or stays above material level sensor switch, observe the switch tail indicator, normally it should goes out. If not, it shows that material level sensor switch is not adjusted. Then press "Out Off" programming key for 6 seconds to complete adjustment.

3) In case adjustments above fail:
     a, check whether material level sensor switch is locked;
     b, check wire connection or replace capacitive switch. (Note: white=signal wire; blue=connect 24V-; brown=connect 24V+)