Differences

This shows you the differences between two versions of the page.

--- en:hw:connection-of-ro-hidden [2021/01/12 14:01]
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+++ en:hw:connection-of-ro-hidden [2022/07/13 14:59] (current)
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-Relay outputs are terminated to **ROy.x** and **COM** and serve for switching two-state devices via either AC or DC power source. The **COM** terminal is usually shared by two relays and is switched to **ROy.x** terminal. Relays are connected in NO states, eg. by default the contacts are disengaged.
+Relay outputs are wired to **ROx** or **ROy.x** and **COM** screw terminals and serve for switching two-states devices. They are capable of switching AC or DC voltage. The COM terminal (which can be shared by two relays) serves for connection of the switched voltage (and others) by the relay to the ROx, or ROy.x terminal. Relays are connected in NO (normally open) states, meaning that by default there is no contact between COM and RO.
-Switching of each really is indicated by a LED with a corresponding label. Overload and overvoltage protection is provided externally by a circuit breaker (ideally one for each output or entire I/O group). Nominal current and circuit breaker type should be selected according to the load and its characteristics concerning the maximum current on the output or output group.
+The state (On/Off) of each relay is indicated by a LED with a corresponding label. Overload and overvoltage protection should be provided externally by a circuit breaker (ideally one for each output). Nominal current and circuit breaker type should be selected according to the load and its characteristics concerning the maximum current on the output.
-<WRAP center round info 95%>
+<WRAP center round important 95%>
+**Caution:** \\
+If an inductive load is connected (e.g., electric motors, relay coils, contactors, or even the cables in extensive electric installations), it is necessary to protect the relay outputs with a corresponding external element (e.g., varistor, RC circuit or a suitable diode).
-**Note:** \\
+If a capacitive load is connected (e.g., power sources of LED lights), it is necessary to protect the relay contacts against inrush current by connecting a corresponding thermistor to the relay's output.
-If an induction load is connected (eg. electric motors, relay coils, contactors or power cables in extensive electric installations), we recommend protecting the relay outputs by a corresponding external element (eg. varistor, RC circuit or a suitable diode).
-If a capacitive load is connected (eg. LED lighting power sources), we recommend protecting relay contacts against inrush current by connecting a corresponding thermistor to the relay's output.
 </WRAP>
 ====== Connection ======
-The following image illustrates the connection of an ohmic (resistance) load with alternating voltage to a relay output:
+The following image illustrates the connection of a resistive AC load to a relay output:
 {{ :en:hw:010_connection_of_io.png?direct&200 |}}