6 Enabling Switch. Beijer Electronics M70

Enabling Switch

6 Enabling Switch

The M70 is equipped with two enabling switches, one at the left and one at the right side of the device. This allows a left- and right-hand operation of the enabling switch. Both enabling switches are equivalent and parallel switched, which means that for enabling, only one of both enabling switches must be activated.

Note:

The enabling switches are hardware dependent, and are separated from the software running in the operator panel. The panel will function normally, regardless of the status of the enabling switches.

Please see chapter

1 Safety Precautions

for safety precautions regarding enabling switches.

The enabling switch consists of a 3-position operating element and an separated evaluation electronics. An essential feature are the continuous two-channel circuits beginning from the actuating elements up to the connecting terminals.

For the evaluation circuits different technologies and circuits are used. Due to the electronic switching contacts, their lifetime does not depend on the load provided the nominal values of the load (ohmic, inductive and capacitive) are not exceeded.

The switching elements of the enabling switches are protected against reversed polarity. The outputs of both circuits are protected against short circuits and overload.

Circuit 1: thermal protective circuit

Circuit 2: fold back line

The actuating element consists of two symmetrically arranged slides. The position of these slides is detected by electrical switches and transmitted to the evaluation electronics.

Positions of enabling switch:

Position

1

2

3

Function Enabling switch Contacts

Home position Not pressed

Enabling

Panic

Pressed

Enabling outputs are open

Enabling outputs are closed

Pressed strongly Enabling outputs are open

16 Beijer Electronics, MAEN843A