Delta RMC101 Manual do Utilizador descarregar pdf (Página 251)

100

101

Digital I/O 5.1

Communications 5-1

CPU: Independent

DI/O: Common high or low side

Logic polarity

CPU: True High

DI/O: Configurable (True high default)

Isolation

2500 VAC RMS

Maximum voltage

±30 V (DC or peak AC)

Maximum current

±100 mA

Max. propagation

delay

1.5 ms

Logic 1

Low impedance (50 W maximum)

Logic 0

High impedance (<1 mA leakage current

at 250 V)

5.1.2 Digital I/O Wiring

Digital Outputs

The outputs from the Digital I/O’s are solid state relays (SSRs). When they are ”r;off” they have

high impedance, and when ”r;on” they have low impedance (50 W maximum, 25 W typical).

Because the outputs are isolated, the user must power them externally. The maximum current

and voltage for the outputs is 100 mA and 30 V.

5.1.2.1 CPU Digital Outputs

Each CPU digital output has a + and - connection. Both lines must be connected for the output to

function. Because both sides of the output are provided, the switches may be independently

connected in a high side or low side configuration (that is, with the load (input) on the source or

sinking side of the output). See the wiring diagrams below.

5.1.2.2 DI/O Digital Outputs

There are nine pins on the ”r;OUTPUTS” section of the Digital I/O. The bottom pin is marked ”r;Output

Cmn” and is common to one side of all the output relays. The other side of the eight SSRs are

numbered 0-7.

The switches can be wired in a high-side or low-side configuration. A high-side configuration ties

”r;Output Cmn” to the output power source; the SSRs control power to the load. A low-side

configuration ties ”r;Output Cmn” to GND.

Digital Output Wiring Diagrams

External Fuses should be used to protect the SSRs if there is a possibility of over-current. When

switching inductive loads, it is important to place a diode or tranzorb across the load to protect the

switch when transitioning from an ”r;on” to an ”r;off” state. Otherwise, the collapsing magnetic

field can cause a reverse voltage spike in excess of the 30 V rating of the SSR. See figures below

1 2 ... 246 247 248 249 250 251 252 253 254 255 256 ... 950 951

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