Define Instruments Zen RTU Operating Manual

16 Input Channels
Isolated Universal inputs, OR Non-Isolated RTD inputs
Modbus option
4 Digital inputs Auto-detecting RS232/
RS485 serial port
Easy USB programming
defineinstruments.com/ workbench
1
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.
ZEN-RTU-MAN-17V01 (0920) Copyright © 2017 Dene Instruments
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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.
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Both direct and alternating current.
Equipment protected throughout by DOUBLE INSULATION or REINFORCED INSULATION.
ORDER CODES
ZEN–RTU /
3
Zen RTU Supply Voltage
Input U
R
Supply Voltage HV
MV
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
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1
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
2
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)
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Load At 5V DC: 1.1mA; At 24V DC: 7mA
Isolation test voltage 1000V DC for 1min
(Digital input to analog input)
5
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
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Programming PortDIN Rail
2
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.
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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
7
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
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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.
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3
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'.
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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.
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PC Connection
INSTALL SOFTWARE FIRST!
4
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
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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.
ZEN-RTU-MAN-17V01 (0920) Copyright © 2017 Dene Instruments
Help Panel
Wiring diagrams, explanations and helpful tips will automati­cally appear in this panel as you congure the Zen.
4.3 - Main navigation
13
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.
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5251506261
60
N/C
N/C
76
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77
79
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N/C
76
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484746
242322
45
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212019
424140
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No user serviceable parts. Only to be installed
484746
242322
45
44
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212019
424140
181716
393837
151413
36
35
34
121110
333231
987
302928
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272625
321
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76
78
77
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N/C
76
75
484746
242322
45
44
43
212019
424140
181716
393837
151413
36
35
34
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302928
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81
5
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
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Port 1 Port 2
5251506261
60
N/C
N/C
76
78
77
79
N/C
N/C
76
75
484746
242322
45
44
43
212019
424140
18171658575655
54
82
81
N/C
N/C
76
78
77
79
N/C
N/C
76
75
484746
242322
45
44
43
212019
424140
18171658575655
54
82
81
5251506261
60
N/C
N/C
76
78
77
79
N/C
N/C
76
75
484746
242322
45
44
43
212019
424140
18171658575655
54
82
81
See 5.4 See 5.5
15
Power Supply
Universal AC/DC
+Ph–
N
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
HV
85–265V AC 95–370V DC
+Ph–
N
MV
24–48V AC 17–72V DC
Digital Inputs
See 5.3
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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).
A
COM
Digital Output
(5–30V DC)
D
C
B
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58
57
56
55
54
D
C
B
A
COM
COM
B
A
D
C
COM
B
A
D
C
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
A
B
C
D
+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.
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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
RX
RS485
COM
NC
TX
NC
NC
COM
Tx+
Tx−
NC
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6
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
Output
External
+24V
Supply
3 Wire
Transmitter
0/4–20mA
Output
External
+24V Supply
4 Wire
Transmitter
0/4–20mA
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Output
20
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–
B+ B–
B+ B–
Input Channel
Input Channel
Input Channel
screen earthed at one end only.
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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
Output
External
+24V
Supply
3 Wire
Transmitter
0–10V DC
Output
External
+24V Supply
4 Wire
Transmitter
0–10V DC
Output
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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.
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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
A
Input
B
Channel
B
A
Input
B
Channel
B
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
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T/C
T/C
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–
B+ B–
B+ B–
Note 1 All thermocouple inputs are iso­lated from each other. There is no need to buy expensive isolated thermocouples.
Thermocouple
Input Channel
Input Channel
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
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25
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.
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/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
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NPN
Collector
Reed Switch
or
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.
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/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.
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Potentiometer
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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
AC
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
In
Attenuator
Out
0–100.00V or
0–1000.0V
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7
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
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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
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8
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.
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A
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)
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Meets Criterion A Meets Criterion A
Meets Criterion A Meets Criterion A (Note 1)
Meets Criterion A Meets Criterion A Meets Criterion A
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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.
ZEN-RTU-MAN-17V01 (0920) Copyright © 2017 Dene Instruments
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
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