Define Instruments Zen RTU Mini Operating Manual

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› 4, 12, or 16 Universal Isolated Inputs

T/C, RTD, mA, mV, V, Potentiometer and more

› Compact design, optimizing DIN rail space › Modbus RTU or TCP connection options, for simple

connection to SCADAs and PLCs

› Optional WiFi connectivity, cutting the cost of cabling › Compact DIN rail mount design › 4 Digital inputs

› Easy USB programming via your PC:

defineinstruments.com/workbench

General Description

The Zen RTU Mini is a Remote Terminal Unit made for harsh industrial environments. Each channel is isolated and EMC hardened. The universal input is one of the most exible on the market, making it a breeze to interface to a wide range of sensors.

The basic Zen RTU Mini unit has four isolated universal input channels, and comes in a compact 1.38" (35mm) case. This can be expanded to 12 inputs (2.36" [60mm] case) or 16 inputs (3.35" [85mm] case).

This expanding design enables you to collate a large number of signals and simply and efciently route them to your PLC or SCADA system, while optimizing your DIN rail space.

Our free WorkBench conguration soware is designed to assist and even teach you how to congure the unit, and provides a range of easy-to-use presets and exible controls. The intuitive help panel follows you during setup and updates automatically with relevant tips, wiring diagrams, and application examples.

Zen RTU Mini

Remote Terminal Unit

Symbol Denitions

CAUTION

Risk of electric shock

Please refer to user manual.

CAUTION

Risk of danger

Please refer to user manual.

Direct current.

Equipment protected throughout by DOUBLE INSULATION or REINFORCED INSULATION.

CONTENTS

Contents ................................................. 2

Order Codes ............................................ 3

Safety Notices ......................................... 3

1 - Specications ................................... 4

2 - WiFi Operating Modes .................... 5

2.1 - Station Mode .......................... 5

2.2 - Access Point Mode .................. 5

3 - Dimensions & Installation .............. 6

3.1 - Case Dimensions ..................... 6

3.2 - Installation Environment ........ 6

3.3 - Installation Instructions .......... 7

3.4 - EMC Installation Guidelines .... 8

4 - Installing Dene WorkBench .......... 9

5 - Soware Conguration ................ 11

5.1 - Connecting ............................ 11

5.2 - WorkBench Interface

Overview ............................... 12

5.3 - Main Navigation ................... 13

6 - Wiring & LED's ............................... 14

6.1 - Zen RTU Mini Terminals ........ 14

6.2 - Analog Input ......................... 15

6.3 - Serial Port (RS232 / RS485) .. 15

6.4 - Digital Input .......................... 15

6.5 - Power Supply ........................ 17

6.6 - Front Panel & LED's ............... 17

7 - Input Wiring & Specications ....... 18

7.1 - Current Input ........................ 18

7.2 - Voltage Input ........................ 20

7.3 - RTD Input .............................. 22

7.4 - Thermocouple Input ............. 23

7.5 - Digital Pulse .......................... 24

7.6 - Potentiometer Input ............. 25

7.7 - AC Current Sensor ................ 26

7.8 - Attenuator ............................ 26

8 - Connecting To A PLC ..................... 27

8.1 - Zen RTU Mini Registers ......... 27

9 - Maintenance .................................. 29

9.1 - Calibration ............................ 29

9.2 - Troubleshooting ................... 29

A - Appendix A - EMC Test Results .... 30

ORDER CODES

ZEN–RTU–MINI – –

Zen RTU Mini Channel Conguration

Channel Conguration 4

12 16

Comms

EMOD WIFI

4 universal inputs, standard 1.38" (35mm) case 12 universal inputs, expanded 2.36" (60mm) case 16 universal inputs, expanded 3.35" (85mm) case

Built in RS485/232 only Built in RS485/232 + Additional Ethernet Modbus/TCP Built in RS485/232 + Additional WiFi

Comm Port(s)

Accessories

Bridge Key BRIDGE-KEY USB Bridge Key, required for PC programming us-

ing our free WorkBench soware

SAFETY NOTICES

For your safety and the prevention of damage to the Zen RTU Mini and other equipment connected to it, please read complete instructions prior to installation and

operation of the Zen RTU Mini and carefully observe all safety regulations and instructions. Consult this manual carefully in all cases where hazard symbols are marked on the Zen RTU Mini.

Use of this instrument in a manner not specied by the manufacturer may compromise the protection provided by the instrument. This instrument should not be used to directly drive valves, motors, or other actuators, unless equipped with appropriate safeguards.

It is the responsibility of the user to identify potential hazards that may arise in the event of a fault to unit, and implement safeguards for the prevention of harm to persons or equipment. The safety of any system incorporating this unit is the responsibility of the assembler of the system.

SPECIFICATIONS

Power

Power supply Low Voltage (10–32V DC)

Isolation test voltage 2500V AC 50Hz for

1min to analog inputs

Isolation to digital inputs None

General specications

Linearity & repeatability <±0.1% FSO

Channel separation 125db minimum

RF immunity <±1% eect FSO typical

Noise immunity (CMRR) 160dB tested at

300V RMS 50Hz

Permanent memory (E

writes per input parameter

ROM) 100,000

Analog input

Universal isolated analog inputs

Zen RTU Mini4: 4 Input channels Zen RTU Mini12: 12 Input channels Zen RTU Mini16: 16 Input channels

See Section 7 for input specications and wiring

Input isolation 2,500V AC 1 minute between all input channels

Isolation test voltage 1000V DC for 1min (Analog input to analog input)

Input resolution 16 bits

Accurate to <±0.1% FSO (unless otherwise

stated in Section 7)

Digital input

4 x Digital inputs

Functions Status, up counter, up/down

counter with direction, debounced counter, frequency, gated frequency

Counter register output 32 bit

Frequency range 0–10,000Hz

Input types NPN, Clean Contact, Voltage

2–30V DC

Threshold 1.2V typical

Debounce counter range 0–100Hz

Isolation Not isolated to power supply

Programming

USB programmable Via 'PC Setup' port using Bridge Key USB programmer (sold separately)

Dene WorkBench Free download at:

deneinstruments.com/workbench

Comms

Protocols Modbus RTU, Modbus TCP

Default comm port RS485 / RS232 auto-

select. Selectable baud rate 2400–230000 baud. Format 8 bit, no parity, 1 stop

Optional additional comm (front panel) Select WiFi or Ethernet Modbus/TCP

Isolation test voltage 1000V DC for 1min (Comm to analog input, Comm to digital input)

Environmental conditions

Operating temp –40 to 176°F (–40 to 80°C)

Storage temp –40 to 176°F (–40 to 80°C)

Operating humidity 5–85% RH max,

non-condensing

Compliances

EN-61326-1:2006

EMC Emissions EN 558022-A;

Immunity EN 50082-1; Safety EN 60950

WIFI OPERATING MODES

Construction

Casing DIN 35 rail mounting; Material: ABS inammability V0 (UL94)

Dimensions (H x W x D)

Zen RTU Mini4 = 3.98 x 1.38 x 4.72" (101 x 35 x 120mm) Zen RTU Mini12 = 3.98 x 2.36 x 4.72" (101 x 60 x 120mm) Zen RTU Mini16 = 3.98 x 3.35 x 4.72" (101 x 85 x 120mm)

Height with antenna

4.65" (118mm), WiFi model only

2.1 - Station Mode

The most common operating mode for a WiFi enabled Zen RTU Mini is the Station (or Client) Mode. This mode is used when the unit is required to connect to an access point of an existing WiFi network as a client.

Depending on the plugin, it can be set up to work with a DHCP server (default setting), or to have a xed (or Static) IP address. The user must enter the SSID and passphrase of the WiFi network that it is attempting to connect to.

2.2 - Access Point Mode

Some WorkBench plugins also allow a WiFi enabled Zen RTU Mini to be run as an access point which is totally independent of any other networks. This can be useful if there are no WiFi networks available, or if they are not accessible for security reasons.

When running in Access Point Mode, the Zen RTU Mini will function as a DHCP server and can work with up to 5 Clients. The user can set the SSID, passphrase, and also which WiFi channel to use.

5.75" (146mm)

4.65" (11 8mm)

Mini16: 3.35"

DIMENSIONS & INSTALLATION

3.1 - Case Dimensions

Mini4: 1.38"

(35mm)

Mini12: 2.36" (60mm)

Mini16: 3.35" (85mm)

4.72" (120mm)

DIN 35 Rail

4.45" (113 mm)

3.98" (101mm)

(35mm)

Mini4: 1.38"

(85mm)

Mini12: 2.36" (60mm)

3.2 - Installation Environment

The Zen RTU Mini should be installed in a location that does not exceed the maximum operating temperature, and at a safe distance from other devices that generate excessive heat. The installation environment should provide good air circulation to the unit.

The plastic casing and product label may be cleaned, if required, using a so, damp cloth and neutral soap product. Caution should

be exercised when cleaning the unit to avoid water dripping inside, as this will damage the internal circuits.

3.3 - Installation Instructions

Antenna mounted outside enclosure using antenna extension cable

The Zen RTU Mini is rated IP20, and should be mounted in a protective enclosure to protect the unit from weather conditions and dust. If using the Zen RTU Mini with WiFi, the unit must be located within range of a WiFi network. The maximum distance is 1476 (450m) L.O.S.

A - Plastic Enclosure (Fig 1)

Prepare the Plastic Enclosure (not supplied) as illustrated by mounting a DIN 35 rail, cable glands, and any other required components.

If you are using the WiFi model, the antenna may be mounted directly on the Zen RTU Mini (inside the Plastic Enclosure).

B - Metal Enclosure (Fig 2)

Prepare the Metal Enclosure (not supplied) as illustrated by mounting a DIN 35 rail, cable glands, and any other required components.

This enclosure type should be earthed.

If you are using the WiFi model or a cellular modem, a Metal Enclosure will impede your signal strength. In these cases, the antenna should be installed on the outside of the enclosure using a compatible Antenna Exten-

sion Cable.

C - DIN Rail Mounting (Fig 3)

To clip the unit onto the DIN rail: (1) Hook the upper part of the unit onto the rail, and then (2) Press down towards the rail until the red hook clicks into place.

Leave at least 0.79" (2cm) clear on either side of the unit, and at least 1.97" (5cm) clear above and below the unit, to allow room for airow and wiring.

Plastic enclosure

Metal enclosure

35mm DIN rail

Fig 1

Fig 2

D - Wiring

Refer to Sections 6–7 in this manual.

Fig 3

E - Removal from DIN Rail (Fig 4)

To unclip the unit from the DIN rail, power the unit down and remove the power connector.

Then insert a small screwdriver into the slot on the red hook (just visible when the power connector is removed), and lever it down. This will release the hook, allowing the unit to be detached from the DIN rail.

3.4 - EMC Installation Guidelines

Fig 4

The Zen RTU Mini has been designed to cope with large EMC disturbances. This

has been achieved by continual testing and improvement of ltering and layout techniques.

The Zen RTU Mini meets CE noise requirements, and even surpasses them in many tests. (For full details and test results, see Appendix A.) However in some applications with less than optimum installations and large power switching, the EMC performance of the unit can be further improved by:

A Installing the unit in an earthed Metal

Enclosure (as in Fig 2). This is particular-

ly useful if the control box is mounted close to large power switching devices like contactors. Every switching cycle there is a possibility of generating a large amount of near eld radiated noise. The Metal Enclosure, acting as a faraday cage, will shunt this radiation to ground and away from the unit.

B Increasing the physical distance from

the power devices. For example, increasing the control box distance from 6" to 12" from the noise source will reduce the noise seen by the control box by a factor of 4. (Probably the cheapest and best results in this situation could

be obtained by adding RC snubbers to the contactors or power switches.)

C Using shielded cable on sensitive input

and control signal lines. Good results can be obtained by grounding the shields to the metal enclosure close to the entry point. All cables act as aerials and pick up unwanted R.F. radiated signals and noise; the earthed shield acts as a faraday cage around the cables, shunting the unwanted energy to ground.

Shields can also help with capacitively coupled noise typically found in circumstances when signal cable is laid on top of noisy switching power cables. Of course in this case you are better o to keep separate signal and power lines.

D Laying cable on earthed cable trays can

also help reduce noise seen by the Zen RTU Mini. This is particularly useful if there are long cable runs, or the unit is close to radiating sources such as two way radios.

Dene WorkBench oers a comprehensive and yet simple-to-use setup tool for your Zen RTU Mini, complete with data log extraction and visualization.

You must install WorkBench before connecting the Zen RTU Mini to your computer. If you have already connected using the Bridge Key, please disconnect before continuing.

A Download the latest version of WorkBench from

www.deneinstruments.com/workbench

B Extract the install le from the zip folder. Right-click on the zip folder and choose

'Extract All', (or extract the le using another extraction utility of your choice).

INSTALLING DEFINE WORKBENCH

C Double-click on the extracted .msi

install le. This will launch the WorkBench installer.

Depending on your security settings, a 'Security Warning' dialog may appear. If you see the security message, click 'Run'.

D The WorkBench setup

wizard will launch.

Click 'Next' to get started.

E The wizard will also ask for

conrmation that you wish to begin the installation.

Click 'Next' to continue.

F The wizard will then prompt

you to select an installation folder.

You may accept the default installation folder, or select an alternative location by clicking 'Browse'.

Click 'Next' to continue.

G Depending on your security

settings, the 'User Account Control' dialog may appear.

If it does, simply click 'Yes ' to allow the program to be installed on your computer.

H The install wizard will now install Dene WorkBench. Please wait. This process usually

takes 2–3 minutes, but may take longer in some situations.

I When the installation has

successfully completed, the following dialog will appear.

Click 'Close' to exit.

The installer will place an icon on your desktop for easy access to WorkBench.

SOFTWARE CONFIGURATION

5.1 - Connecting

Connect the Bridge Key

To program your Zen RTU Mini, connect one end of the Interface Cable to the 'PC Setup' port on the unit's front panel, and the other end to your Bridge Key.

Then plug the Bridge Key into your computer's USB port (see Fig 5).

Supply Power

Supply power to the Zen RTU Mini, referring to 6.1 for wiring.

Connect to your Zen RTU Mini in Dene WorkBench

Launch Dene WorkBench (see Section 4 for installation instructions), and select the 'Prog Port' tab.

If your Zen RTU Mini is powered up and connected via the Bridge Key, then the COM Port will be detected automatically. Click 'Connect'.

Fig 5

5.2 - WorkBench Interface Overview

Main Navigation, including channel sub-navigation. See 5.3 for more information.

Control Area

Main control area for conguring your system. Any changes made in this area will bring up the Apply Button (see below)

Connection Panel

Disconnect button Connection status

Apply Button

Appears if you have made any changes in the Control Area. WorkBench will not allow you to browse to a new tab in the Main Navigation with unapplied changes to your conguration.

Help Panel

Wiring diagrams, explanations and helpful tips will automatically appear in this panel as you congure the unit.

5.3 - Main Navigation

Overview

View basic device information including Serial Number and rmware version. Password protect, export a conguration certicate, and save/upload conguration settings.

Ports

This tab is only visible if you are connected to your Zen RTU Mini via the USB Programming Port. It enables you to congure a range of settings for the default RS232 / RS485 port.

Inputs

Set up and scale the universal isolated input channels. Includes integrated wiring diagrams and examples.

Digital Inputs

Set up the four digital inputs and view their live status.

Totalizers

Congure up to 10 totalizers using either an input channel or a digital input as the source.

Plugins

Plugins are small programs which are loaded into the Zen RTU Mini to expand its functionality or simplify its use. Available plugins include:

Ĝ WiFi (requires WiFi hardware)

Enables your Zen RTU Mini to wirelessly connect to a LAN or the internet via a local WiFi network, allowing it to become a Modbus TCP server for configuration or data viewing applications.

Ĝ Ethernet (requires Ethernet hardware)

This plugin enables your Zen RTU Mini to connect to a LAN or the internet via wired Ethernet connection, allowing it to become a Modbus TCP server for configuration or data viewing applications.

WIRING & LED'S

6.1 - Zen RTU Mini Terminals

Upper Terminals

Lower Terminals

Zen RTU Mini16

(Channels 13−16)

Zen RTU Mini12

(Channels 5−12)

Zen RTU Mini4

(Channels 1−4)

Zen RTU Mini4

(Channels 1−4)

Zen RTU Mini12

(Channels 5−12)

Zen RTU Mini16

(Channels 13−16)

6.2 - Analog Input See 6.1A (also 6.1E–G for Zen RTU Mini12/16)

The four primary analog input channels (included for all Zen RTU Mini models) are shown in

6.1A. For Zen RTU Mini models with expanded input channels, please also refer to 6.1E (for channels 5–8), 6.1F (for channels 9–12), and 6.1G (for channels 13–16).

All input terminals are universal and can be wired for a range of input types, as detailed in Section 7. Please also refer to the product label for input terminal pinouts.

6.3 - Serial Port (RS232 / RS485) See 6.1B

The auto-detecting serial terminal on the top side of the unit can be wired for either RS232 or RS485, as shown.

COM

TX+

TX–

COM

RS232

RS485

NOTE Pins marked 'NC' MUST be le disconnected to ensure correct auto-detection of your comm type.

6.4 - Digital Input

See 6.1C

The Zen RTU Mini has four Digital Inputs (A–D) which can be congured and scaled using Dene WorkBench from the "Digi-

tal Inputs" tab, as per the list below:

› Status (active/inactive - can be read by a SCADA system as

a general digital input)

› Counter (up to 10KHz, or 100Hz Debounced) › Frequency (up to 10KHz) › Flow count (up to 10KHz) › Flow rate (up to 10KHz) › RPM (up to 10KHz)

External

+24V

Supply

COM

D A

3 Wire Proximity

Transducer,

Paddle Wheel etc.

Output

Selected digital input channel

D D

D B

D C

+5V

Reed Switch or

Relay Contact

COM

D A

D B

D C

Selected digital input channel

D D

+5V

Open Collector O/P

Selected digital input channel

COM

D A

D D

D B

D C

+5V

Digital Output

(5–30V DC)

COM

D A

D B

NOTE The Digital Inputs can be congured in soware to be either Sinking (active low input) or Sourcing (active high input). The diagrams in this manual are for Sinking

wiring, which is the default conguration. To view Sourcing wiring, please refer to the help information provided in Dene WorkBench.

Connection example for digital inputs (A–D)

Reed Switch or Relay Contact

3-wire Proximity Transducer, Paddle Wheel etc.

–

Com

Selected digital input channel

D D

D C

+5V

Digital Output

5-30V DC

Open Collector

–

+24V Supply

Note 1 All cables must be screened, with screen earthed at one end only.

NOTE The universal analog inputs can also be wired as digital pulse inputs (see 7.5).

6.5 - Power Supply

See 6.1D

Wire your power supply for 10–32V DC supply, as shown.

(If the supply voltage is less than 10V at power up, the power LED (see

6.6B) will ash very quickly every 2–3 seconds until the supply voltage reaches an acceptable level.)

CAUTION

Low voltage (10–32V DC) only. Higher voltages will damage the

Zen RTU Mini.

6.6 - Front Panel & LED's

A - Programming port

See 5.1

B - Additional comm port and LED status area

10–32V DC

EMOD

LED

Description

Flashing between Green & Red= Normal operation. Red for 2–3 seconds following power up= Unit is booting up

and checking for errors.

Intermittent rapid ashing Red= Supply voltage is too low. Red continually= Error (contact your distributor).

Flashing= Data is being transmitted, or a connection is being

established.

Link LED's indicate the status of the wireless link.

Green O, Red On= Not connected (idle). Green/Red Toggling= Trying to connect in Station Mode. Green/Red Flashing= Trying to connect in Access Point Mode. Green On, Red O= Station Connected. Green On, Red On= Access Point Connected.

Note: See Section 2 for more information on WiFi operating modes.

WIFI

INPUT WIRING & SPECIFICATIONS

CAUTION

Risk of electric shock. Dangerous and lethal voltages may be present on the input termi-

nals. Please take appropriate precautions to ensure safety.

CAUTION

Risk of danger. The sensor input can potentially oat to dangerous and unexpected volt-

ages depending on what external circuit it is connected to. Appropriate considerations must be given to the potential of the sensor input with respect to earth common.

7.1 - Current Input

Range 0–20mA, 4–20mA

Input impedance 45Ω

Maximum over-range protected by PTC

to 24V DC

Accuracy 0.1% FSO max

0/4–20mA DC is the most commonly used analog signal in industry, and is universally accepted. As a current loop, it is unaected by voltage drops in cables, and can be transmitted over long distances without signal degradation.

Linearity & repeatability 0.1% FSO max

Channel separation 0.001% max

Ambient dri 0.003%/°C FSO typical

RF immunity 1% eect FSO typical

Output

External

+24V

Current

0/4–20mA

Supply

2 Wire Loop

Powered

Transmitter

4–20mA

Output

External

+24V

Supply

3 Wire

Transmitter

0/4–20mA

+24V Supply

4 Wire

Transmitter

0/4–20mA

Output

External

Connection example for 2, 3 & 4 wire mA output transmitters

+24V Supply

2-Wire

Transmitter

B+ B–

Input Channel

Output +

Output −

Output +

Output −

Power

Supply

3-Wire

Transmitter

4-Wire

Transmitter

Note 1 All analog inputs are isolated to other channels and all other voltages. They also have built in over voltage protection to 24V, protecting the unit if the 24V supply is inadvertently connected to the unit when congured for mA input.

Note 2 All cables must be screened, with screen earthed at one end only.

B+

Input Channel

B–

B+

Input Channel

B–

Note 3 Do not run input cables in close vicinity to noisy power supplies, contactors or motor cables. The best practice is to run input cables on a separate earthed cable tray. This will minimize RFI eects, of which magnitude cannot be easily predicted.

7.2 - Voltage Input

Ranges ±200mV, –200mV to 1V, 0–10V, 0–18V

Input impedance >500KΩ on all ranges

Maximum over-voltage 24V DC

Linearity & repeatability 0.1% FSO max

Channel separation 0.001% max

Ambient dri 0.003%/°C FSO typical

RF immunity 1% eect FSO typical

Accuracy 0.1% FSO max

The Zen RTU Mini accepts both voltage and millivolt inputs. Along with the standard 0–10V DC range, a variety of other ranges are provided to suit a various applications. These can all be selected using the WorkBench soware and easily scaled into engineering units.

The ±200mV DC and -200mV to 1V DC ranges are ideal for low signal applications, such as measuring large DC currents using external current shunts, or interfacing to sensors with low voltage output. A 0–18V general purpose voltage range is also provided.

0–10V, ±200mV

–200mV to 1V,

0–18V DC

Output

External

+24V Supply

2 Wire

Transmitter

0–10V DC

Output

External

+24V

Supply

3 Wire

Transmitter

0–10V DC

Output

External

+24V Supply

4 Wire

Transmitter

0–10V DC

Output

Connection Example for Millivolt & Voltage Inputs for 2, 3 & 4 Wire Transmitters

+24V Supply

2-Wire

Transmitter

B+ B–

Input Channel

Output +

Output −

Output +

Output −

Power

Supply

3-Wire

Transmitter

4-Wire

Transmitter

Note 1 Each voltage input must not see more than 18V peak between the negative and the input, otherwise permanent damage may occur.

Note 2 All cables must be screened, with screen earthed at one end only.

B+

Input Channel

B–

B+

Input Channel

B–

3-Wire

Field RTD

3-Wire

Field RTD

3-Wire

Field RTD

7.3 - RTD Input

RTD Pt100 3 wire RTD DIN 43760: 1980

RTD Pt1000 3 wire RTD standard

Resolution

-328–572°F (-200–300°C) = 0.02°F (0.01°C)

-328–1472°F (-200–800°C) = 0.1°F (0.1°C)

Lead resistance 10Ω/lead max

Sensor current 0.6mA continuous

Sensor fail upscale

Accuracy

-328–572°F (-200–300°C) = ±0.1°C

-328–1472°F (-200–800°C) = ±0.3°C

Ambient dri 0.003°C/°C typical

recommended

The RTD (standing for Resistance Temperature Device) is highly stable and accurate, and is fast becoming the most popular temperature sensor in industry. Oen referred to as Pt100 and Pt1000, the Pt represents platinum (the dominant metal in its construction), and 100/1000 is the resistance in ohms at 0°C.

Supported RTD types/ranges

Pt100/Pt1000 (0.02°F/0.01°C res) -328 to 572°F (-200 to 300°C)

Pt100/Pt1000 (0.1°F/0.1°C res) -328 to 1472°F (-200 to 800°C)

Note 1 All RTD inputs are isolated from

each other.

Note 2 All RTD cables must be screened, with screen earthed at one end only. All three wires must be the same resistance (i.e. the same type and size).

Note 3 To minimize lead resistance errors, 3-wire RTD’s should be used. Oset errors for 2-wire RTD’s may be compensated for in the soware.

Note 4 Do not run input cables in close vicinity to noisy power supplies, contactors or motor cables. The best practice is to run input cables on a separate earthed cable tray. This will minimize RFI eects, of which magnitude cannot be easily predicted.

Connection Example for 3-Wire RTD Inputs

Input

Channel

Input

Channel

Input

Channel

RTD 3 Wire

Pt100/1000

7.4 - Thermocouple Input

T/C

Thermocouple types B, E, J, K, N, R, S or T type (see table below for ranges)

Cold junction compensation 14 to 140°F (–10 to 60°C)

CJC dri <0.02°C/°C typical for all inputs

The thermocouple is one of the most common temperature sensors used in industry. It relies on the Seebeck coecient between dissimilar metals. The thermocouple type is selected with reference to the application temperature range and environment, with J and K type being the most common.

Connection Example for Thermocouple Inputs

B+ B–

Note 1 All thermocouple inputs are isolated from each other. There is no need to buy expensive isolated thermocouples.

Thermocouple

Input Channel

Sensor open Upscale

TC lead resistance 100Ω max

Input impedance >500KΩ

Accuracy 0.1% of FSO ±1°C typical

Supported thermocouple types/ranges

B 32 to 3272°F (0 to 1800°C)

E -328 to 1292°F (-200 to 700°C)

J -328 to 1832°F (-200 to 1000°C)

K -328 to 2300°F (-200 to 1260°C)

N -328 to 2372°F (-200 to 1300°C)

R 32 to 3092°F (0 to 1700°C)

S 32 to 3092°F (0 to 1700°C)

T -328 to 752°F (-200 to 400°C)

Note 2 For accurate thermocouple mea-

surements (especially at low temperatures) the top cover must always be tted. Avoid dras and temperature dierences across terminals. Once installation is complete, close the cabinet door and allow the cabinet to reach equilibrium. This may take several hours. Place all thermocouple probes into a calibrated thermal bath at temperature of interest. Any osets can be zeroed out in the soware.

Note 3 All thermocouples are referenced to a combination of four CJC temperature sensors on the main Zen board. This minimizes errors caused by the mounting orientation of the Zen unit, and temperature dierences in enclosures. However, for high accuracy applications it is still

recommended to zero errors (see Note 2).

Note 4 All cables must be screened, with screen earthed at one end only.

Note 5 When thermocouple inputs are selected, an upscale resistor is automatically connected to the T/C + input, resulting in an overow condition for open or broken sensors.

7.5 - Digital Pulse

Frequency range 0–2500.0Hz

Fast counter range 0–2500.0Hz

Sensors Open collector (NPN, PNP), TTL

or Clean Contact

The Zen RTU Mini's universal input terminals accept digital inputs from NPN, PNP or TTL sensors as well as Clean Contacts. Pulses up to 2.5kHz can be counted (except for the debounced counter, which has a range of 0–50Hz).

A variety of operating modes are soware programmable to suit your application.

Frequency resolution 0.1Hz

Debounce counter range 0–50Hz max

Counter register output 32 bit

Accuracy ±0.5%

Soware programmable modes include:

› General counter › General debounced counter (ideal for

mechanical relay contacts which are subject to bouncing)

› General frequency › Flow count (uses K-factor) › Flow rate (uses K-factor) › RPM (uses pulses per revolution)

NPN Open

Collector

Output

PNP Open

Collector

Output

TTL Input

Reed Switch or

Relay Contact

NPN

Collector

Reed Switch

Contact

PNP

Collector

TTL

(0-5V max)

Connection Example for Digital Pulse Inputs

A+

Relay

Input Channel

B–

A+

Open

Input Channel

B–

A+

Open

Input Channel

B–

Input

5V 0

Input Channel

A+

B–

7.6 - Potentiometer Input

Potentiometer input 3-wire

Excitation voltage Variable

Potentiometer resistance <2kΩ low pot;

>2kΩ high pot

Field prog zero 0–90% of span

Note 1 All digital inputs are isolated from

each other. Inputs from various sources can be connected without fear of crating unwanted and troublesome ground loops.

Note 2 Soware selectable functions include: frequency to 2kHz, debounced counter for contact closures to 100Hz maximum, fast counter to 20KHz.

Note 3 All cables must be screened, with screen earthed at one end only.

Field prog span 0.1–100%

Linearity and repeatability

<±0.05% FSO typical

Response time 100msec

Temperature dri <50ppm/°C

A 3 wire potentiometer is typically used to measure position. A low or high potentiometer range can be programmed to your unit using the WorkBench soware.

These ranges must be calibrated using the two point calibration method.

Potentiometer

ACCS Jump Ranges

200A

010/420: 420-L:

7.7 - AC Current Sensor

Sensor type Current transformer ACCS-420, ACCS-420-L and ACCS-010

Header selectable amperage range

ACCS-420/010 = 100/150/200A ACCS-420-L = 10/20/50A

Output (Representing 0–100% of full scale input range) ACCS-420(-L) = 4–20mA DC loop powered ACCS-010 = 0–10V DC

Isolation voltage 2,000V

Power supply

ACCS-420(-L) = Loop powered, 15–36V DC ACCS-010 = Self powered

Overload (continuous)

ACCS-420/010 = 175/300/400A respectively ACCS-420-L = 80/120/200A respectively

Accuracy 1% of full scale

Response time 250ms (10–90%)

Frequency 50–60Hz

The Zen RTU Mini accepts input from a Dene Instruments AC current sensor.

Set the jumper on the top of the current sensor to the desired current range, as shown below.

0–100A 0–10A

0–150A 0–20A

0– 0–50A

Current

Sensor

External

AC Current

Sensor

4–20mA

24V DC

Supply

AC Current

Sensor

AC Current

Sensor

0–10V

7.8 - Attenuator

Max input voltage 1000V DC

Attenuation factor 1000

±0.1%

Input impedance 3.8MΩ

This unit accepts input from a high voltage attenuator (HVA-1000). Wire the attenuator as shown.

Output impedance 3.8kΩ

Attenuator type Dierential

resistive

Ambient dri 50ppm/°C max

Attenuator

Out

0–100.00V or

0–1000.0V

CONNECTING TO A PLC

8.1 - Zen RTU Mini Registers

Below is a list of the commonly used Zen RTU Mini registers, displayed rst in Modicon addressing format, and then as a direct address (brackets).

For a full register list, please see the Zen Registers document, available at:

deneinstruments.com/zen-registers

Analog inputs 32 bit signed registers

Ch1= 40645 (644) / 40646 (645) Ch9= 40661 (660) / 40662 (661)

Ch2= 40647 (646) / 40648 (647) Ch10= 40663 (662) / 40664 (663)

Ch3= 40649 (648) / 40650 (649) Ch11= 40665 (664) / 40666 (665)

Ch4= 40651 (650) / 40652 (651) Ch12= 40667 (666) / 40668 (667)

Ch5= 40653 (652) / 40654 (653) Ch13= 40669 (668) / 40670 (669)

Ch6= 40655 (654) / 40656 (655) Ch14= 40671 (670) / 40672 (671)

Ch7= 40657 (656) / 40658 (657) Ch15= 40673 (672) / 40674 (673)

Ch8= 40659 (658) / 40660 (659) Ch16= 40675 (674) / 40676 (675)

Analog inputs 32 bit oating point

Ch1= 41193 (1192) / 41194 (1193) Ch9= 41209 (1208) / 41210 (1209)

Ch2= 41195 (1194) / 41196 (1195) Ch10= 41211 (1210) / 41212 (1211)

Ch3= 41197 (1196) / 41198 (1197) Ch11= 41213 (1212) / 41214 (1213)

Ch4= 41199 (1198) / 41200 (1199) Ch12= 41215 (1214) / 41216 (1215)

Ch5= 41201 (1200) / 41202 (1201) Ch13= 41217 (1216) / 41218 (1217)

Ch6= 41203 (1202) / 41204 (1203) Ch14= 41219 (1218) / 41220 (1219)

Ch7= 41205 (1204) / 41206 (1205) Ch15= 41221 (1220) / 41222 (1221)

Ch8= 41207 (1206) / 41208 (1207) Ch16= 41223 (1222) / 41224 (1223)

Counter/frequency inputs 32 bit signed integers

Counter1= 40525 (524) / 40526 (525) Counter3= 40529 (528) / 40530 (529)

Counter2= 40527 (526) / 40528 (527) Counter4= 40531 (530) / 40532 (531)

Totalizers 32 bit signed integers

Total1= 40289 (288) / 40290 (289) Total6= 40299 (298) / 40300 (299)

Total2= 40291 (290) / 40292 (291) Total7= 40301 (300) / 40302 (301)

Total3= 40293 (292) / 40294 (293) Total8= 40303 (302) / 40304 (303)

Total4= 40295 (294) / 40296 (295) Total9= 40305 (304) / 40306 (305)

Total5= 40297 (296) / 40298 (297) Total10= 40307 (306) / 40308 (307)

MAINTENANCE

9.1 - Calibration

Your Zen RTU Mini has been fully calibrated at the factory, and can be recalibrated in soware using Dene WorkBench (see Section 5). Scaling to convert the input signal to a desired display value is also done using WorkBench

If your Zen RTU Mini appears to be behaving incorrectly or inaccurately, refer to troubleshooting before attempting to calibrate it. When recalibration is required (generally every 2 years), it should only be performed by qualied technicians using appropriate equipment.

Calibration does not change any user programmed parameters. However, it may aect the accuracy of the input signal values previously stored.

9.2 - Troubleshooting

Issue Resolution

Auto-detecting RS Port is not working

Power LED stays red continuously

Cannot power up unit Check the power supply connections and supply range. (The

Ethernet device does not appear on the network when trying to connect in WorkBench

Ensure that any terminal connections marked 'NC' are le open - otherwise the Zen RTU Mini will not be able to autodetect your serial type.

Indicates an internal error which will need to be assessed by the manufacturer. Please return the Zen RTU Mini to the manufacturer for analysis and repair.

polarity on the power input is irrelevant.)

Repower the device aer you plug in the ethernet cable to ensure that it appears on the network.

For further assistance, please contact technical support using the contact details listed at the end of this document.

APPENDIX A - EMC TEST RESULTS

Statement of Compliance

Products in the Dene Instruments 'Zen' series comply with EN 61326-1:2006.

Results Summary

The results from testing carried out in March 2014 are summarized in the following tables.

Immunity - Enclosure Ports

Phenomenon Basic Standard Test Value Performance Criteria

EM Field IEC 61000-4-3 10Vm (80MHz to 1GHz)

Electrostatic Discharge (ESD)

IEC 61000-4-2 4kV/8kV contact/air Meets Criterion A (Note 1)

3V/m (1.4–2.7GHz)

Immunity - Signal Ports

Phenomenon Basic Standard Test Value Performance Criteria

Conducted RF IEC 61000-4-6 3V (150kHz to 80MHz) Meets Criterion A

Burst IEC 61000-4-4 1kV (5/50ns, 5kHz)

Surge IEC 61000-4-5 1kV L-E Meets Criterion A (Note 1)

1kV (5/50ns, 100kHz)

Meets Criterion A

Meets NAMUR NE 21 recommendation

Meets Criterion A (Note 1) Meets NAMUR NE 21 recommendation

Immunity - AC Power

Phenomenon Basic Standard Test Value Performance Criteria

Conducted RF IEC 61000-4-6 3V(150Khz to 80Mhz) Meets Criterion A

Burst IEC 61000-4-4 2kV (5/50ns, 5kHz) L-N

1kV (5/50ns, 5kHz) L-L

Surge IEC 61000-4-5 2kV L-E

1KV L-L

Voltage Dips IEC 61000-4-11 0% during 1 cycle

40% during 10/12 cycles 70% during 25/30 cycles

Short Interruptions IEC 61000-4-11 0% during 250/300 cycles Meets Criterion A (Note 1)

Meets Criterion A Meets Criterion A

Meets Criterion A Meets Criterion A (Note 1)

Meets Criterion A Meets Criterion A Meets Criterion A

Performance Criteria

Performance Criterion A

During the test, normal performance within the specication limits.

Performance Criterion B

During testing, temporary degradation, or loss of performance or function which is self-recovering.

Performance Criterion C

During testing, temporary degradation, or loss of function or performance which requires operator intervention or system reset occurs.

*Note 1: EN61326-1 calls for a Criterion B pass; unit exceeds this by meeting Criterion A.

De ne Instruments

New Zealand

(Head O ce)

Auckland 0632, New Zealand

Auckland 0661, New Zealand

Ph Fax

www.de neinstruments.co.nz

10B Vega Place, Rosedale,

PO Box 245 Westpark Village,

: +64 (9) 835 1550

: +64 (9) 835 1250

sales@de neinstruments.co.nz

Zen RTU Mini Document Revision Code: ZEN-RTU-MINI-MAN-17V01 Date Code: 170202

United States (Dallas, TX)

Ph: (214) 926 4950

sales@de neinstruments.com

www.de neinstruments.com

South Africa (Pretoria)

sales@de neinstruments.co.za

www.de neinstruments.co.za

Define Instruments Zen RTU Mini Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual