Honeywell DCP552 Mark II user manual External Switch Input Connection

Chapter 4. WIRING

4 - 10 External Switch Input Connection

SW1	SW2	SW3	SW4 SW5		SW6 SW7 SW8
RUN	HOLD	RESET	ADV
1	2	3	4	13	14	15	16	12

SW9 SW10 SW11 SW12 SW13 SW14 SW15 SW16
								: With BCD
					CH1 CH2
1	2	4	8	10	20cancel cancel
25	26	29	30	33	34	37	38	41

●Internal circuit diagram of the DCP552 connecting external switch input

8.5V DC

Handling Precautions

8.5V DC

Internal circuit

•The inputs of the DCP552 unit are provided with a built-in power supply (open voltage type, 8.5V DC). Always use no-voltage contacts externally.

•For the no-voltage contacts, use gold contacts or other relays that switch on small currents. Other types of relay contacts may not switch. Use contacts that have ample margin over the minimum switching capacity with respect to the current and open voltage ratings of contacts provided on the DCP552.

•If using semiconductors (open collectors, etc.) as no-voltage contacts, use one that maintains a potential of no more than 2V across the contacts when actuated, and a leakage current of no more than 0.1mA when shut off.

•The digital inputs (remote switch inputs) of all SDC40 and SDC10 series units can be connected in parallel. If connecting them in parallel to another instrument, carefully check the requirements of the other instrument before proceeding.

•Do not connect SDC20/21, SDC30/31 series in parallel. Doing so may cause the external switch input to malfunction.

•Common terminals (12) and (41) of the external switch input are connected internally.

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