Introduction
Applicable for appliances: VT825 & VT825DC with VT18 / extension module, VT900, VT960, VT960i, VT960ii.
These systems have the possibility to connect up to x2 loads managed by built-in relays. Built-in relays have independent separate entrances and exits. The appliances use latching relays, when power on appliance switches on/off, relays remain in command position!
Purpose
Relays are needed for control of AC/DC mains: e.g. lamps, fans, or other devices.
Function
A relay is an electromagnetic switch operated by a relatively small current that can control a much larger current.
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Example 2: When the current stops flowing through the coil, the internal contact returns to its initial state i.e. the normally closed (NC) terminal connects to the common (COM), and the normally open (NO) terminal reopens.
COM (Common): This is the pin you should connect to the signal (mains electricity in our case) you are planning to switch.
NC (Normally Closed): A normally closed configuration is used when you want to turn off the relay by default. In this configuration, the relay is always closed and remains closed until you send a signal from Vutlan monitoring system to the relay module to open the circuit.
NO (Normally Open): A normally open configuration works the other way in which the relay is always open until you send a signal from Vutlan monitoring system to the relay module to close the circuit.
Connecting the load to VT825 and
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VT825DC by relays
To connect an external load, connect the wires from the external power supply to the appropriate medium (2) clamps of the relay terminal plug, the load to the left (1) or right (3) clamps of the plug. Insert the plug into the relay socket terminal RLY1 ... RLY2. By command, the relay will switch on or off the load. The maximum possible output current of the relay - 10A.
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