Define Instruments Zen RTU Operating Manual

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› 16 Input Channels

Isolated Universal inputs, OR Non-Isolated RTD inputs

› Modbus option

For easy integration with SCADAs and PLCs

› 4 Digital inputs › Auto-detecting RS232/

RS485 serial port

› Easy USB programming

defineinstruments.com/ workbench

Zen RTU

Remote Terminal Unit

General Description

The Zen RTU/U 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 Zen RTU/R provides a lower cost, non- isolated temperature (RTD) only version, suitable for more benign applications like cool store monitoring.

Both units have 16 input channels, enabling you to collate a large number of signals, and simply and eciently route them to your PLC or SCADA system.

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.

CONTENTS

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

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

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

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

2 - Dimensions & Installation ................ 6

2.1 - Case dimensions ........................ 6

2.2 - Installation environment ........... 6

2.3 - Installation instructions ............ 7

2.4 - EMC installation guidelines ....... 8

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

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

4.1 - Connecting ............................... 11

4.2 - WorkBench interface

overview .................................. 12

4.3 - Main navigation ...................... 13

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

5.1 - Zen RTU terminals ................... 14

5.2 - LED indicators ......................... 16

5.3 - Digital inputs ........................... 16

5.4 - Port 1 (optional) ..................... 18

5.5 - Port 2 ....................................... 18

6 - Input Wiring & Specications ........ 19

6.1 - Current input .......................... 19

6.2 - Voltage input .......................... 21

6.3 - RTD input ................................ 23

6.4 - Thermocouple input ............... 24

6.5 - Digital pulse ............................ 25

6.6 - Potentiometer input ............... 26

6.7 - AC current sensor .................... 27

6.8 - Attenuator .............................. 27

7 - Connecting To A PLC ...................... 28

7.1 - Zen registers ............................ 28

8 - Maintenance ................................... 29

8.1 - Calibration ............................... 29

8.2 - Troubleshooting ...................... 29

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

Symbol denitions

CAUTION

Risk of electric shock

Please refer to user manual.

CAUTION

Risk of danger

Please refer to user manual.

Both direct and alternating current.

Equipment protected throughout by DOUBLE INSULATION or REINFORCED INSULATION.

ORDER CODES

ZEN–RTU / – –

Zen RTU Supply Voltage

Input U

Supply Voltage HV

Port 1 Comm

EMOD

16 x Isolated Universal Inputs 16 x Non-isolated RTD Inputs

85–265V AC / 95–370V DC 24–48V AC / 17–72V DC

No Port 1 Comm Ethernet Modbus

SAFETY NOTICES

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

eration of the Zen and carefully observe all safety regulations and instructions. Consult this manual carefully in all cases where hazard symbols are marked on your Zen unit.

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.

Port 1 CommInput

SPECIFICATIONS

Power

Power supply

HV= 85–265V AC / 95–370V DC, OR MV= 24–48V AC / 17–72V DC

Supply frequency 50/60Hz, 10VA

Mains isolation 250V AC

Mains isolation test voltage to all inputs and outputs 3000V AC 50Hz for 1min

General specications

Linearity & repeatability <±0.1% FSO

Channel separation 125db minimum

Noise immunity (CMRR) 160dB tested at

300V RMS 50Hz

RF immunity <±1% eect FSO typical

Permanent memory (E

writes per input parameter

ROM) 100,000

Analog input ZEN-RTU/R

16 x Non-Isolated RTD Inputs

See 6.3 for specications and wiring

Input isolation Not isolated

Input resolution 16 bits

Digital input

4 x Opto isolated inputs with LED indication of each input

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 voltage 5–30V DC

Threshold 4.6V typical

Debounce counter range 0–100Hz

Analog input ZEN-RTU/U

16x Isolated Universal Inputs

See Section 6 for 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 6)

Load At 5V DC: 1.1mA; At 24V DC: 7mA

Isolation test voltage 1000V DC for 1min

(Digital input to analog input)

Comms

Protocols Modbus RTU, RS232 or RS485

Port 1 Select either:

No Port 1 Comm OR EMOD= Ethernet Modbus (10/100/Auto)

Port 2 RS232 / RS485 auto-select Selectable baud rate 2400–230000 baud Format 8 bit, no parity, 1 stop

Isolation test voltage 1000V DC for 1min between comms and analog/digital input

Programming

USB programmable Via USB prog port using Bridge Key USB programmer (sold separately)

Dene WorkBench Simple conguration using Dene WorkBench. Free download at:

deneinstruments.com/workbench

Construction

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

Compliances

EN-61326-1:2006

EMC Emissions EN 558022-A;

Immunity EN 50082-1; Safety EN 60950

Dimensions (H x W x D, with plugs in)

2.32 x 10.04 x 5.67" (59 x 255 x 144mm)

Unit weight ZEN-RTU/U = 25.8oz (730g) ZEN-RTU/R = 24.6oz (696g) EMOD or EIP = Add 0.2oz (6g)

Environmental conditions

Operating temp 14 to 140°F (–10 to 60°C)

Storage temp –4 to 176°F (–20 to 80°C)

Operating humidity 5–85% RH max,

non-condensing

Programming PortDIN Rail

DIMENSIONS & INSTALLATION

2.1 - Case dimensions

0.18"

(4.5mm)

4.55"

(115.5

mm)

5.69" (144.4mm)

9.69" (246mm)

10.04" (255mm)

2.52" (64 mm)

2.35" (59.8mm)

2.2 - Installation environment

The Zen 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.

2.3 - Installation instructions

The Zen RTU is rated IP20, and should be mounted in an enclosure to protect the unit from weather conditions and dust.

A - Installation in Enclosure (Fig 1)

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

If using a metal enclosure, the enclosure must be earthed.

B - DIN Rail Mounting (Fig 2)

To clip the unit onto the DIN rail: (1) Hook the lower part of the unit onto the rail, and then (2) Press down towards the rail until the red hooks click into place

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

Fig 1

C - Wiring

Refer to Sections 5–6 in this manual.

D - Removal from DIN Rail (Fig 3)

To remove the unit from the DIN rail: (1) Power down the unit (2) Unplug the 'Input 4' and 'Port 1' connectors from the top of the Zen (the DIN clips are behind these terminals) (3) Gently pull the unit away from the rail while levering one of the clips upward with a screwdriver (4) When one side is loosened, hold it slightly away from the rail to prevent the clip from engaging again (pictured in Fig 3). Meanwhile, lever the second clip upward as you did with the rst.

Fig 2

Fig 3

2.4 - EMC installation guidelines

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

achieved by continual testing and improvement of ltering and layout techniques over many years.

The Zen 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 Zen can be further improved, by:

A Installing the unit in an earthed Metal

Enclosure. This is particularly 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 Zen.

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. This is particularly useful if there are long cable runs, or the unit is close to radiating sources such as two way radios.

E The relay outputs of the Zen have built

in MOV's to help reduce EMI when switching inductive loads. EMI can further be reduced at the load by adding snubbers for AC signals or a yback diode for DC coils.

Dene WorkBench oers a comprehensive and yet simple-to-use setup tool for your Zen RTU.

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

A Download the latest version of WorkBench from

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.

PC Connection

INSTALL SOFTWARE FIRST!

SOFTWARE CONFIGURATION

4.1 - Connecting

Connect the Bridge Key

To program your Zen RTU, connect one end of the Interface Cable to the programming port on the le side of the Zen (see Fig 4), 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, referring to 5.1 for wiring.

Bridge Key

Interface Cable

Zen RTU

Connect to your Zen in Dene WorkBench

Launch Dene WorkBench (see Section 3 for installation instructions), and select the 'Prog Port' tab. If your Zen is powered up and connected via the Bridge Key, then the COM Port will be detected automatically. Click 'Connect'.

Fig 4

Power Supply

Fig 5

4.2 - WorkBench interface overview

Main Navigation, including channel sub-navigation. See 4.3 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 Zen.

4.3 - Main navigation

Overview

View basic device information including Serial Number and rmware version. Password Protect your device, export a conguration certicate and save/upload a conguration le.

Ports

This tab is only visible if you are connected to your Zen via the USB Programming Port. It enables you to congure a range of settings for Port 1 and Port 2 (baud rate, parity, Tx delay etc.).

Once your ports are set up, you will be able to congure to your Zen in WorkBench via Port 1 or Port 2 instead of the USB programming port - perfect for adjusting settings once your unit is installed.

Inputs

Set up and scale the 16 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.

Totalizers are only available for the Zen RTU/U.

Plugins

Plugins are small programs which are loaded into the Zen to expand its functionality or simplify its use. Plugins are optional and in many cases they may not be needed. Note that only one plugin can be installed on your Zen at a time.

5251506261

N/C

484746

242322

212019

424140

181716

393837

151413

121110

333231

987

302928

654

272625

321

5857565554

N/C

No user serviceable parts. Only to be installed

484746

242322

212019

424140

181716

393837

151413

121110

333231

987

302928

654

272625

321

5857565554

5251506261

N/C

484746

242322

212019

424140

181716

393837

151413

121110

333231

987

302928

654

272625

321

5857565554

WIRING & LED'S

5.1 - Zen RTU terminals

Programming Port

Programming connection to Dene WorkBench using the Bridge Key.

See Section 4 for more information

ZEN-RTU/U-HV-EMOD

4613003

/U/RIsolated Universal Input

PROG PORT

HVMV85−265V AC / 95−370V DC

EMOD

EIP

FW:SN:

2.1.01

Non-Isolated RTD Input

24−48V AC / 17−72V DC

Ethernet Modbus

EtherNet/IP™

Input Channels

See Section 6

Input Channels

See Section 6

Port 1 Port 2

5251506261

N/C

484746

242322

212019

424140

18171658575655

N/C

484746

242322

212019

424140

18171658575655

5251506261

N/C

484746

242322

212019

424140

18171658575655

See 5.4 See 5.5

Power Supply

Universal AC/DC

+Ph–

CAUTION! HAZARDOUS

VOLTAGES

No user serviceable parts. Only to be installed

by service personnel. See installation

instructions prior to connecting to supply.

00-20-4A-DB-50-49

MAC

Zen RTU

Isolated Universal Input

85–265V AC 95–370V DC

+Ph–

24–48V AC 17–72V DC

Digital Inputs

See 5.3

Receive/Transmit lines

ON = Error (contact manufacturer)

5.2 - LED indicators

The Zen RTU has 10 LED indicators on the top label (or 8, for units with no comms option installed in Port 1). These LED's provide information about the unit's status, as explained below:

ON = Digital Input Active OFF = Digital Input Inactive

ON = Power is supplied to the unit

FLASHING = Normal operation

Indicates activity on the

5.3 - Digital inputs

The Zen RTU has four Digital Inputs (A–D), each with LED indication on top of the unit. The digital inputs can be congured and scaled using Dene WorkBench from the "Digital 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)

NOTE For the Zen RTU/U, the universal analog inputs can also be wired as digital pulse inputs (see 6.5).

COM

Digital Output

(5–30V DC)

COM

External

+24V

Supply

Reed Switch or

Relay Contact

External

+24V

Supply

3 Wire Proximity

Transducer,

Paddle Wheel etc.

Connection example for digital inputs (A–D)

Reed Switch or Relay Contact

3-wire Proximity Transducer, Paddle Wheel etc.

Digital Output

5-30V DC

Open Collector

4.7kΩ

Output

External

+24V

Supply

Open

Collector

Output

Com

+24V Supply

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

Note 2 Do not t the 4K7 resistor for 3-Wire PNP transducers.

5.4 - Port 1 (optional)

Port 1 on the Zen RTU is optional. If lled, the option is Ethernet Modbus.

5.5 - Port 2

Port 2 can be wired for either RS232 or RS485 serial connection, as shown (right).

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

RS232

RS485

COM

Tx+

Tx−

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.

6.1 - Current input

Range 0–20mA, 4–20mA

Input impedance 45Ω

Maximum over-range protected by PTC

to 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

Zen RTU/U

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. Current input is accepted by the Zen RTU/U only.

Current

0/4–20mA

External

+24V

Supply

2 Wire Loop

Powered

Transmitter

4–20mA

Output

External

+24V

Supply

3 Wire

Transmitter

0/4–20mA

Output

External

+24V Supply

4 Wire

Transmitter

0/4–20mA

Output

Fail-Safe Micro Switch

If you are connecting other instruments in a loop with a Zen mA input, a fail-safe has been added to prevent the external loop from being interrupted in the event of a power loss to the Zen.

To activate the fail-safe for an input channel, turn on the micro switch above the input terminal. You will need to remove the input connector to see the switch, and use a small screwdriver to turn it on.

NOTE

The Fail-Safe Micro Switch is only compatible with mA inputs on the Zen RTU/U.

For the accurate operation of this instrument, it is critical that the micro switch be set to the OFF position for all other input types.

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

+24V Supply

Fail-safe Micro Switch

2-Wire

Transmitter

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

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 minimise RFI eects, of which magnitude cannot be easily predicted.

B+ B–

Input Channel

screen earthed at one end only.

6.2 - 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

Zen RTU/U

Accuracy 0.1% FSO max

The Zen RTU/U 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–

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 minimise RFI eects, of which magnitude cannot be easily predicted.

3-Wire

Field RTD

3-Wire

Field RTD

3-Wire

Field RTD

6.3 - 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 recommended

Sensor current 0.6mA continuous

RTD input is accepted by both the Zen RTU/R and the Zen RTU/U. The RTD is highly stable and accurate. Oen referred to as Pt100 and Pt1000, the Pt represents platinum, 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)

Connection Example for 3-Wire RTD Inputs

Input

Channel

Input

Channel

A B B

Input Channel

Sensor fail upscale

Accuracy (RTU/R)

-328–572°F (-200–300°C) = ±0.2°C

-328–1472°F (-200–800°C) = ±0.3°C

Accuracy (RTU/U)

-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

Note 1 Inputs are isolated for the Zen RTU/

U, and non-isolated for the Zen RTU/R.

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 minimise 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 minimise RFI eects, of which magnitude cannot be easily predicted.

Zen RTU/UZen RTU/R

RTD 3 Wire

Pt100/1000

T/C

6.4 - Thermocouple input

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

Zen RTU/U

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.

6.5 - 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/U's 16 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.

Zen RTU/U

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

Reed Switch or

Relay Contact

TTL Input

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–

6.6 - 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.

Zen RTU/U

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:

6.7 - 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

The Zen RTU/U 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

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

Current

Sensor

AC Current

Sensor

4–20mA

External

24V DC

Supply

Zen RTU/U

AC Current

Sensor

AC Current

Sensor

0–10V

6.8 - Attenuator

Max input voltage 1000V DC

Attenuation factor

1000 ±0.1%

Input impedance 3.8MΩ

The Zen RTU/U 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

Zen RTU/U

Attenuator

Out

0–100.00V or

0–1000.0V

CONNECTING TO A PLC

7.1 - Zen registers

Below is a list of the commonly used Zen RTU registers. 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= 645/646 Ch2= 647/648

Ch3= 649/650 Ch4= 651/652

Ch5= 653/654 Ch6= 655/656

Ch7= 657/658 Ch8= 659/660

Ch9= 661/662 Ch10= 663/664

Ch11= 665/666 Ch12= 667/668

Ch13= 669/670 Ch14= 671/672

Ch15= 673/674 Ch16= 675/676

Analog inputs 32 bit oating point

Ch1= 1193/1194 Ch2= 1195/1196

Ch3= 1197/1198 Ch4= 1199/1200

Ch5= 1201/1202 Ch6= 1203/1204

Ch7= 1205/1206 Ch8= 1207/1208

Ch9= 1209/1210 Ch10= 1211/1212

Ch11= 1213/1214 Ch12= 1215/1216

Ch13= 1217/1218 Ch14= 1219/1220

Ch15= 1221/1222 Ch16= 1223/1224

Counter/frequency inputs 32 bit signed

Totalizers 32 bit signed integers

integers

Counter1= 525/526

Counter2= 527/528

Counter3= 529/530

Counter4= 531/532

Total1= 289/290 Total2= 291/292

Total3= 293/294 Total4= 295/296

Total5= 297/298 Total6= 299/300

Total7= 301/302 Total8= 303/304

Total9= 305/306 Total10= 307/308

MAINTENANCE

8.1 - Calibration

Your Zen RTU has been fully calibrated at the factory, and can be recalibrated in soware using Dene WorkBench (see Section 4). Scaling to convert the input signal to a desired display value is also done using WorkBench

If your Zen unit 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.

8.2 - Troubleshooting

Issue Resolution

Input signal is not reading correctly on Zen RTU/U

Auto-detecting RS Port is not working

Beat light stays ON for more than 1 minute

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

Check positioning of fail-safe micro switch

The fail-safe micro switch should be switched o for all input types except mA. See 6.1 to conrm.

Ensure that any terminal connections marked 'NC' are le open - otherwise the Zen will not be able to auto-detect your serial type.

This indicates an error. Please return the Zen RTU 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 Document Revision Code: ZEN-RTU-MAN-17V01 Date Code: 170920

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 Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual