VT18 extension board

Supply includes

№	Component	Description
1		VT18 / Extension board
2		BH16 to BH16 cable
3		2 power cables
4		Terminal plug 2 pins, 3.81 mm - 1 pc
5		Terminal plug 6 pins, 3.5 mm - 2 pcs
6		Terminal plug 6 pins, 5.08 mm - 1 pc
7		M3*6mm bolts 4 pcs

Introduction

Applicable for appliances: VT825 & VT825DC with VT18 / extension module, VT825i, VT825ii, VT855i, VT855ii, VT960i, VT960ii, 

These systems can 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 the power on the appliance switches on/off, relays remain in the 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.

The relay has 5 pins, x3 of them are high voltage terminals (NC, COM, and NO) that connect to the device you want to control.

The mains electricity enters the relay at the common (COM) terminal. While the use of NC & NO terminals depends upon whether you want to turn the device ON or OFF.

Example 1: When current flows through the coil, the electromagnet becomes charged and moves the internal contacts of the switch. Normally open (NO) terminal connects to the common (COM), and the normally closed (NC) terminal becomes disconnected.

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 the 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 the Vutlan monitoring system to the relay module to close the circuit.

Connecting the load using relays

Example 1: Controlling AC 230V light

Example 2: Controlling DC 12V, 1A lock

Other pages of interest

"Connecting dry contacts inputs".

Using Groups

There can be a lot of dry contacts and sometimes you just want one triggered event for many of them at the same time. You can create a group and place multiple dry contacts into it. Any element in the group will trigger an event such as a notification for example.

Using group notifications

Introduction

For internal contacts, you can specify the type of behavior (normal or reversive) and specify the type of input. "User-defined type" only affects the icon in the interface. Types can be the following:  airflow, door,  motion, smoke, vibration, water, and no special type (by default).

For dry contacts on the CAN bus, "Alarm" duration control is also available. This holds on an active level when the signal is already removed from the input. This allows you to suppress the instability of the input signal, if necessary.

The dry contacts window is designed to control dry contacts of internal dry inputs, VT440, VT16, and other extensions. The general view is shown here:

To create the logic for an arbitrary group of contacts press the button "" in the upper left corner. This starts with a wizard creating a logic circuit.

As the first step of the wizard, you must select the dry contacts to create a logical scheme.

After you click OK, you are prompted to create a trigger.

The trigger can be not created. But in this case, in "THEN" the logic circuit can be used only existing elements.

As the last step, you need to edit and create a logic circuit with the OK button.

Do not forget to save all new settings and logic schemes into flash memory by clicking "" in the right top corner of the interface!

Content

Introduction

To switch on/off all relays for all units go to the "Main menu" "" >> "System Tree">> Choose a "Relay" element you want to configure and click on it >> A modal window with properties will pop up:

Example: The relay is "Off". Let's say we need to switch it "On" for 30 seconds. In the field "New state" choose "Pulse"; specify "Pulse duration" for 30 sec. Then press "Apply" or "Save". The relay will switch to the "On"  state for 30 seconds. Then it will return to the "Off" state.

Outlets switching

To start managing relay switching of VT604 or VT608 units, go to "Main menu" "" >> "Outlets" menu. You should see the outlets:

First, choose which outlets you need to switch to "On" or "Off" state, then press "Apply". The interface window will update itself in a moment:

For the picture above, we've switched "On" Relay-1 (Outlet-1) and Relay-3 (Outlet-2). They are highlighted in green color. Outlet-2 and Outlet-4 are currently off.

It is possible to manage each outlet individually. For that go to "  " >> "Group tree" or "System tree" menu >> click on any of the four relays. 

API: Relay switching

Read more at:

Relay switching (NC NO) / Outlets switching