Using onboard voltage sensors

What is dew point?

Each Vutlan monitoring system has one or two built-in voltage sensors.

The sensor shows the voltage value on the power input of the main PCB board. The system automatically switches to a higher power supply voltage. If Voltage 1 is greater than Voltage 2, the system will use Voltage 1 as a power input. If Voltage 1 is lesser than Voltage 2, the system will use Voltage 2 as a power input.

Voltage sensor threshold recommendations:

Voltage input	Decription

Voltage input	Decription
5-6 V DC	Absolute minimum voltage for the main PCB board to work. Any voltage below it and the PCB board will shut down.
9 V DC	At this voltage value the NC-NO-COM relays may or may not switch.
12 V DC	Optimum voltage level for the whole system to operate.
14 V DC	This is a maximum voltage level that can be applied. Any voltage above it and the PCB board will turn off or burn out.

The amount of voltage input sensors depends on your Vutlan monitoring system. Please check this table for such information Comparison chart: Master modules and Comparison chart: PDUs VT604 & VT608

Configure Voltage sensor

Vutlan Web Interface >> System tree panel >> System group vertical group tab >> Onboard vertical tab >> Voltage 1 or Voltage 2

You will be presented with a modal window:

Name	Default names are `Voltage 1` or `Voltage2`. You can change the default name to your liking.
ID	System ID of the element. Will be given once the element is saved in the system.
Type	voltage
Class	analog
Current state	The state depends on threshold level. Can be `Low alarm`, `Low warning`, `Normal`, `High warning`, `High alarm`.
Current value	The current voltage value of power input.
Thresholds	Configure the thresholds. These thresholds can be used inside the logic schemes to program notifications and actions. `Low alarm`, `Low warning`, `Normal`, `High warning`, `High alarm` Read more at Adding logic schemes & Logic schemes panel
Hysteresis type	Sensors have the option of setting the hysteresis state. Hysteresis can be a time, a value or it can be disabled. If the hysteresis is set in time, the sensor will transmit to a new state with a delay of the specified number of seconds in the corresponding field. The time counting will begin from the moment when the measured value of the sensor has left the current range. Each state has its own field. Which determines the time that the sensor value must continuously hold for the state to change to the specified. Read more at: Sensor configuration

Using voltage sensors in logic schemes

Example 1: The system has only one power supply input

If there’s a voltage drop, we want to be notified.

Example 2: The system has two power supply inputs

The sensor shows the voltage value on the power input of the main PCB board. The system automatically switches to a higher power supply voltage. If Voltage 1 is greater than Voltage 2, the system will use Voltage 1 as a power input. If Voltage 1 is lesser than Voltage 2, the system will use Voltage 2 as a power input.

The following logic scheme allows checking both power supplies for a drop in voltage below a minimum.

Example 3: Check if the reserve power supply has been activated.

Make sure that Voltage 1 is the main power supply and Voltage 2 is a reserve power supply.
First, let’s create a math sensor. Vutlan Web Interface >> System tree panel >> Press the plus sign at the top right corner

Configure the math sensor. Let’s put the Low warning level at a negative number near zero -0.1. This value is made up, please make sure you test this value in real conditions.

If (Voltage 1 - Voltage 2) < 0, the math sensor will be in a Low warning state. We can use this warning state in our logic.

Now we can go to the Logic Schemes panel and add the following logic. If (Voltage 1 - Voltage 2) < -0.1) then we will send e-mail notifications, make a phone dial and activate a siren on 12 VDC power output number 1.