VT520DIN / AC Voltage monitor (link)

Product page: https://vutlan.com/analog-sensors/133-vt520din-ac-voltage-monitor.html

Datasheet page: https://vutlan.atlassian.net/l/cp/XJqBinZs

Description

Function and purpose

AC voltmeter (a.k.a. sensor, voltage monitor, voltage meter) is needed for the measurement of AC 0-246V.  It has a high accuracy of 1%.

Can be connected to any analog port (A1...A8) of the Vutlan monitoring unit. It is an analog plug-and-play sensor.

The maximum amount of sensors and maximum length can be extended using the VT408 / Sensor extension unit.

Technical specifications

Components

The sensor consists of

• DIN rail 2M plastic housing: flammability rating is UL94V-0; body color is grey; the material is ABS

• AC voltage meter board

Package includes:

	Package content	Description	Quantity
1		Voltmeter	1 pc
2		plastic guard	1 pc
3		DIN rail / wall clip	1 pc
4		6P4C RJ11 Telephone cable 2m	1 pc

Safety instructions

Carefully READ and FOLLOW the safety precautions outlined below BEFORE working with the voltmeter.

• Only qualified electrical workers should install this equipment. Such work should be performed only after reading this entire set of instructions.

• NEVER work alone.

• Before performing visual inspections, tests, or maintenance on this equipment, disconnect all sources of electric power. Assume that all circuits are live until they have been completely de-energized, tested, and tagged. Pay particular attention to the design of the power system. Consider all sources of power, including the possibility of backfeeding.

• Turn off all power supplying the voltmeter and the equipment in which it is installed before working on it.

• Always use a properly rated voltage-sensing device to confirm that all power is off.

• Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. In the USA, see NFPA 70E

• Before closing all covers and doors, carefully inspect the work area for tools and objects that may have been left inside the equipment.

• Use caution while removing or installing panels so that they do not extend into the energized bus; avoid handling the panels, which could cause personal injury.

• The successful operation of this equipment depends upon proper handling, installation, and operation. Neglecting fundamental installation requirements may lead to personal injury as well as damage to electrical equipment or other property.

• The power meter should be installed in a suitable electrical and fire enclosure.

Dimensions

Mounting

1. The device is mounted onto a DIN rail 35mm bar.

2. Insert the wall clip / DIN rail clip into the enclosure.

3. Insert/press the enclosure onto the DIN rail bar.

4. In case You need to unmount it, pull the wall clip / DIN rail guard with the screwdriver and pull the enclosure outwards.

Wiring

1. Switch OFF the power of the AC line and follow other instructions from the section "Safety instructions".

5. Follow power cable specifications for the next step.

Specifications		Strip length	Wire cross-section	Screw head
Terminal block Pins: 2P Step: 5.08 mm, 0.2 in		6 - 7 mm, 0.23 - 0.27 in	2.5 mm², 0.09 in² #26 - #12 AWG	Flat 3.5 mm, 0.13 in

6. Insert the power cables.

7. Connect the device with the Vutlan monitoring system using a 6P4C RJ11 cable (cable is supplied).

9. Turn the AC line power back ON.

Connecting analog sensors

Included page Analog sensors connection

VT520DIN is an analog plug-and-play sensor. It is connected to an analog port of any Vutlan monitoring system.

Connection wiring/cable pinouts

Cable 6P4C RJ11

Used for connecting the device with

The transducer and the transceiver are installed together.

• Mount the transducer using M4 screws and M4 nuts. The distance between mounting holes is 50 mm.  

• Mount the current transceiver using M4 screws and M4 nuts. The distance between mounting holes is 60 mm.

• Use a 4-core flat cable and two green connectors supplied with the transceiver and the transducer to assemble the connecting cable.

Configuring analog sensors

Contents

• Contents
• Settings tab
• Hysteresis
  • Example: Why do we need to use Hysteresis
• Tuning the sensor value
  • Sensor readings can be tunned by a linear formula "y = k * x - b"
• Charts tab
• Reset smoke sensors
• Child pages

Settings tab

To configure a sensor, go to "Main menu" >> "System tree" and click on the sensor element in the tree. A modal window with sensor properties will pop up. Change the needed settings and click "OK" or "Apply" at the bottom of the "Properties" window.

All sensors include:

Name	The name is given by the system automatically. You can change it to anything you want.
ID	System ID of the element.
Type	Examples: temperature, humidity, vibration.
Class	Examples: analog, CAN, switch, discrete.
Hardware port	The external port number on the device panel to which the sensor is connected (if the sensor is external).

All sensors have threshold controls:

In the picture above, the "Current value" equals 41.0 and is represented by the small triangle. Currently, the triangle is green because it is situated in the "Normal" range. Hence the sensor says that the "Current state" is "Normal". This value is used by the system's "Logic schemes" menu to notify the administrator or take action.

Hysteresis

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 field. Which determines the time that the sensor value must continuously hold for the state to change to the specified.

If you set the hysteresis by value, the sensor transition to a new state will occur when the measured value of the sensor exits beyond the current range, adjusted for the specified hysteresis value.

You can calibrate the sensors. Use K and B coefficients. After the calibration, please, save the values in flash memory.

To save sensor properties in the device's flash memory press "  "  then "OK" to confirm. 

Example: Why do we need to use Hysteresis

Let’s say that we have a temperature sensor. Let’s say that we have set up threshold values.

We have set the value 25.5 °C to be a threshold value between Normal/Alarm states.

If the temperature drops just below 25.5 °C You will have a “Normal” state.

If the temperature goes just above 25.5 °C You will have a “Warning” state.

Sometimes the temperature may stay at 25.5 °C and jump up and down by 0.1-0.3 °C. In this case, You will get too many notifications that the sensor is showing a Warning or Normal state.

In this case, we need to use a Hysteresis.

If the type “time” is chosen, the system will wait for a specified time before the State of the sensor is declared.

If type “value” is used, unless the temperature drops by a larger amount than specified, the sensor state will not be declared.

Tuning the sensor value

Sensor readings can be tunned by a linear formula "y = k * x - b"

Example VT407 + HAT-100Q1 / AC current converter:

Metered current for HAT: from 0 to 100A (This means that the range equals 100, k = 100)

The output of VT407 is 0-5V (That means that the range is equal to 5)

"b" = the value that the sensor shows in WebUI when there's no current. Let's say that b = + 0.021

You should use the following formula for HAT: 100/5*(x-y)

The expression formula would be 20*(x-0.021)

Point is used as a decimal separator (3.14)

Charts tab

The charts tab shows the following:

Display chart for	last 100 seconds last 100 minutes last 100 hours last 100 days
Refresh data	Start	Poll a sensor
Reset all charts	Reset all	Clears all saved data for the sensor.
Export data	XML or CSV	Exporting data through WebUI does not work for more than a couple of days and is very rough. If you need detailed log data, use the logging of sensor values to the media. Read more at System Log, Sensors dump files. Note: Make sure no endpoint security services used in the network are not blocking the download of XML and CSV files.

• Example: Using fuel tanks.

Reset smoke sensors

If analog sensors like VT560 / Smoke detector/ sensor detects smoke or fire, it will go into “Alarm” mode. Alarm mode can only be switched off manually using the Reset smoke detectors panel or using the onboard sensor Analog sensor power reset is found in the “System tree” >> “Onboard”.

Child pages

• Example: Using fuel tanks.

Technical support

The device does not contain any user-serviceable parts. If the power meter requires service, contact your local sales representative. Do not open the device. Opening the device voids the warranty.

Troubleshooting

The following table describes potential problems and their possible causes. It also describes checks you can perform or possible solutions for each. After referring to this table, if you cannot resolve the problem, contact your local Vutlan sales representative for assistance.

Frequently asked questions

Copyright:

Vutlan s.r.o. (LLC)

Remote Infrastructure Monitoring and Control

43 ul.Svornosti, 821 06 Bratislava,

Slovak Republic

www.vutlan.com