Wow.. Microprocessor system in STAHL Crane

My manager gives me a new study on SLE system which is a microprocessor controller in STAHL crane system. The usage of this Micro-controller are:-

1. Check error signal
- Sensor error
- Overload
- Overtemperature
- Control error
- System error
- Device faulty
(need to trouble shoot possible cause and remedy)

2. Warning signal
- Evaluation unit crane test mode
- Out of the permissible cut-off range
- Sensor current too low

3. Setting cut-off point when overload occur

4. Motor management

SLE 21



SLE Load sensor using combination of electrical sensor and mechanical switch



SLE setting Switch S1, S2, S3, S4




Microprocessor system board inside the SLE






The circuit design of SLE



Next day,

I have study more futher advance of micro-controller which is SMC, a programmable control, evalution and switching devices for single or dual-speed motors. The micro- comtroller can be optimally adapted to the application of controlling a hoist motor, and provides the basis for safe working, long service life and documentaion of the actual use of the hoist. The SMC funtion as:-

1. Automatic Load control (ALC)
2. Temperature Control
3. Slack rope cut-off
4. Load spectrum monitoring
5. Save and culculate oprating data

SMC21


After the study, the manager ask me to do DEMO by myself.





Connecting the SMC with power supply to the Transformer 240/110 V



Then, connect the SMC to the computer device. (Before this, need to install STAHL crane test Software).


Do the Demo by reading the instruction in the document file.



Do setting (Use an Example from the instrution) on the SMC by using STAHL software





After finish all the settings, I try to lift up and down to get signal during the Demo.




Show result of overload in crane system




Finally, I fail to do demo that show no any signal. Haiz...