Chapter 4. WIRING

4-12 Connecting External Switch (RSW) Input

The DCP301 is provided with four external switch inputs as standard (eight optional). The optional eight inputs are located on the add-on terminal base. Wire the external switch inputs across the standard and add-on terminal bases.

Standard terminal base

RSW1

21

Contact

RSW2

22

Contact

RSW3

23

Contact

RSW4

24

Contact

25

COM

Add-on terminal base

RSW5

41

Contact

RSW6

42

Contact

RSW7

43

Contact

RSW8

44

Contact

RSW9

45

Contact

RSW10

46

Contact

RSW11

47

Contact

RSW12

48

Contact

Handling Precautions

The external switch inputs on the DCP301 have built-in power supplies (open voltage 12Vdc). Be sure to use no-voltage contacts for external contacts.

Use no-voltage contacts such as gold contacts whose small current can be switched ON/OFF. On some relay contacts, the small current cannot be switched ON/OFF. Use no-voltage contacts having a sufficient minimum switching ca- pability with respect to the contact current and open voltage of the DCP301.

When using a semiconductor (e.g. open-collector) as a no-voltage contact, use a semiconductor whose contact terminal voltages at contact ON are 3V max., and whose leakage current at contact OFF is 0.1mA.

External switch inputs on the DCP301/302 can be connected in parallel.

When connecting in parallel with other controllers, thoroughly check the condi- tions of the other controller before configuring the control system.

4-14

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Image 46
Sonic Alert DCP301 user manual Connecting External Switch RSW Input