Tekron ITR User manual
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Index
Table of Contents
ITR............................................................................................................................................... 1
USER MANUAL............................................................................................................................ 1
Index........................................................................................................................................... 2
Safety Symbols ........................................................................................................................... 3
Document Conventions.............................................................................................................. 3
Safety Warnings ......................................................................................................................... 4
Introduction................................................................................................................................ 5
Copper Input (Order Code D1) .................................................................................................. 5
Fibre Input (Order Code D2)....................................................................................................... 6
HV MOSFET (Order code D3) ..................................................................................................... 6
ITR Product Codes ...................................................................................................................... 8
LED Indicators............................................................................................................................. 9
ITR Inputs.................................................................................................................................... 9
Copper Inputs............................................................................................................................. 9
Fiber Inputs................................................................................................................................. 9
ITR Outputs............................................................................................................................... 10
Copper Loop Output................................................................................................................. 10
Fiber Output............................................................................................................................. 10
TTL Output............................................................................................................................... 10
RS422 /RS 485 Outputs ............................................................................................................ 10
RS 232 Output ......................................................................................................................... 10
MOSFET Output........................................................................................................................ 10
Optional AM IRIG-B Output..................................................................................................... 10
General User Guideline ............................................................................................................ 11
General Installation Guideline.................................................................................................. 12
Identification ............................................................................................................................ 12
Location.................................................................................................................................... 12
Power Supply............................................................................................................................ 12
Hazardous Voltage ............................................................................................................... 13
ITR Terminals............................................................................................................................ 13
Earthing .................................................................................................................................... 15
Warranty .................................................................................................................................. 15
Contact ..................................................................................................................................... 15
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Safety Symbols
Safety symbols used on this product are: -
HAZARDOUS VOLTAGE
Contact will cause electric shock or burn.
CAUTION
Used to alert for important information.
PROTECTIVE EARTHING TERMINAL
Protective Earthing Conductor ≥0.75mm2shall be connected to GND terminal to
protect against electric shock hazard.
READ INSTRUCTION MANUAL
Read the Instruction manual before installing or servicing this product.
Document Conventions
The Symbols used in this document
Is used to highlight additional information.
Is used to highlight any safety or regulatory points.
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Safety Warnings
RESTRICTED ACCESS LOCATION
The ITR should be installed in a Restricted Access location, accessible only using a
lock and key or other means of security.
INSTALLATION ENCLOSURE
The ITR should be installed on a DIN rail in an enclosure which acts as a Fire
Enclosure and an Electrical Enclosure.
INSTALLATION PRACTICE
The ITR should be installed by suitably qualified personnel.
Wiring, cable entries, conduit entries, knock-outs or glands should be installed in
accordance with local wiring regulations.
HAZARDOUS VOLTAGE. Disconnect before working on product
DC supply voltage up to 300V.
DUAL SUPPLY. Disconnect both supplies before working on the product
Hazardous voltage may be present on DC supply and PR-, HV-SW-, HV-SW+ and
PR+ terminals.
DISCONNECT DEVICE(S)
Each Hazardous Voltage circuit which connects to the ITR shall incorporate a
readily accessible disconnect device installed externally to the ITR.
Disconnect devices shall have contact separation of at least 3mm.
HAZARDOUS VOLTAGE. Stray conductors or loose connections.
Provide insulation and strain relief on all Hazardous Voltage terminations to
protect against electric shock hazard.
OVERCURRENT PROTECTION –HV MOSFET
Circuit from an external supply to HV MOSFET connections on the ITR shall be
protected with an external 300 Vdc fuse rated at less than or equal to 1A.
OVERCURRENT PROTECTION - POWER
Circuit from an external supply to the PWR connections on the ITR shall be
protected with 300 Vdc an external fuse rated at less than or equal to 1A.
PROTECTIVE EARTH
The unit must be safety earthed whenever it is powered on, using the GND
terminal as pictured above. The cable cross section must be equal to or greater
than 0.75 mm2 (18 AWG).
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Introduction
The Isolated Timing Repeater (ITR) is a compact DIN rail mountable signal repeater
providing 2.0kV electrical isolation between the power and I/O wiring and 3.5kV
electrical isolation between input and earth for connected Intelligent Electronic
Devices (IEDs).
The ITR performs a number of tasks including converting time sync signals from fiber to
copper, (and vice versa), boosting signal strengths and converting one type of signal to
another.
The ITR is available in multiple variants: -
Copper Input (Order Code D1)
•Takes a copper based pulse or IRIG-B signal as input.
•Provides a non-isolated loop output of the input signal.
•Provides isolated TTL, RS232 and RS422 as standard outputs
•Provides isolated AM IRIG-B as an optional output.
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Fibre Input (Order Code D2)
•Takes a copper or Fibre based pulse or IRIG-B signal as input.
•Provides isolated Fibre, TTL, RS232 and RS422 as standard outputs
•Provides isolated AM IRIG-B as an optional output.
HV MOSFET (Order code D3)
•Takes a Copper or Fibre based pulse or IRIG-B signal as input.
•Provides isolated Fibre and HV MOSFET output as standard.
For the HV MOSFET wiring use a slow blow with a 300V dc voltage rating fuse no
greater than 200mA.
Note: For the HV MOSFET ITR option high voltage may be present on the HV terminals as
well as the PWR input terminals. For this reason, there is a DUAL SUPPLY label affixed to
warn of this as pictured above.
All three configurations can be ordered with a low, medium or high voltage power supply
option with typical power drain of 5W max. The power to I/O isolation is 2kV.
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For further reading you can refer to the following documents on the Tekron website
www.tekron.com
•ITR Datasheet https://tekron.com/dmsdocument/109
•Typical Installation Guide https://tekron.com/dmsdocument/103
•Declaration of Conformity https://tekron.com/dmsdocument/260
•RoHS Statement https://tekron.com/dmsdocument/110
•Order Code Guide https://tekron.com/dmsdocument/108
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ITR Product Codes
The tables below summarize the ITR order options.
Copper
ITR Order Code Guide
Order Code
D1
-
X
X
Description
Product Type
ITR Signal Repeater (Copper Version)
D1
Description
Connector Type
Specification
Power Supply Options
Low Voltage
2 pin screw terminal
14-36 Vdc (360 –140 mA)
1
Medium Voltage
2 pin screw terminal
20-75 Vdc (250 –80 mA)
2
High Voltage
2 pin screw terminal
90-300 Vdc (56 –17 mA)
3
Description
Connector Type
Specification
TTL Output
2 pin screw terminal
0-5V, 150mA Fused
RS232 Output
2 pin screw terminal
±10V (Typical unloaded), 15mA
(max)
2 pin screw terminal
±5V, 50 RS422 Loads (RS485
Compatible)
Description
Connector Type
Signal Type
Specification
Options
DC IRIG-B to AM IRIG-B Converter
2 pin screw terminal
AM IRIG-B
8V pk-pk, Internal impedance:120Ω
J
No Secondary Output
N/A
N/A
N/A
K
Fiber
ITR Order Code Guide
Order Code
D2
-
X
X
Description
Product Type
ITR Signal Repeater (Fiber Version)
D2
Description
Connector Type
Specification
Power Supply Options
Low Voltage
2 pin screw terminal
14-36 Vdc (360 –140 mA)
1
Medium Voltage
2 pin screw terminal
20-75 Vdc (250 –80 mA)
2
High Voltage
2 pin screw terminal
90-300 Vdc (56 –17 mA)
3
Description
Connector Type
Specification
Standard Outputs
Fiber
ST Fiber Connection
62.5/125um, λ = 820 nm, multi-
mode
TTL Output
2 pin screw terminal
0-5V, 150mA Fused
RS232 Output
2 pin screw terminal
±10V (Typical unloaded), 15mA
(max)
RS422 Output
2 pin screw terminal
±5V, 50 RS422 Loads (RS485
Compatible)
Description
Connector Type
Signal Type
Specification
Options
DC IRIG-B to AM IRIG-B Converter
2 pin screw terminal
AM IRIG-B
8V pk-pk, Internal impedance:120Ω
J
No Secondary Output
N/A
N/A
N/A
K
HV MOSFET
ITR Order Code Guide
Order Code
D3
-
X
Description
Product Type
ITR Signal Repeater (HV MOSFET Version)
D3
Description
Connector Type
Specification
Power Supply Options
Low Voltage
2 pin screw terminal
14-36 Vdc (360 –140 mA)
1
Medium Voltage
2 pin screw terminal
20-75 Vdc (250 –80 mA)
2
High Voltage
2 pin screw terminal
90-300 Vdc (56 –17 mA)
3
Description
Connector Type
Specification
Output
Fibre
ST Fiber Connector
62.5/125 um, λ = 820 nm, multi-mode
HV MOSFET Output –Screw Terminals
2 pin screw terminal
300 Vdc (+0V tolerance), ≤100mA
Note that if 300V is used for both supply and HVMOSFET, that the input voltage
tolerance must match that of the HVMOSFET = 300V +0V tolerance.
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LED Indicators
ITRs have two green LEDs: -
PWR: On solidly when the correct power is supplied to the ITR
SIG: Lit when the input signal is at a logic high level. Normally this LED will flicker at a
100Hz rate when an IRIG-B signal is fed to the ITR.
ITR Inputs
Copper Inputs
All ITR types can take a TTL level signal fed into the Input terminals at the top right of the
ITR. The polarity of this driving signal must match that on the ITR label.
Note: The copper input signal can be any TTL signal such as an IRIG-B, or it can be pulsed at
TTL Levels (for example Pulse per second). The current loading at 5V is 2mA maximum.
If the ITR is part of a daisy-chained string of devices, the LOOP terminals on the Copper ITR
can be used to wire to the next device in the daisy-chain. For the other ITR types, both the
incoming and outgoing IRIG-B signals can be wired to the same Input terminals.
It the ITR is the last device in the daisy-chain, then the TERM connections can be shorted
which will terminate the incoming IRIG-B signal with 120Ω.This will correctly terminate a
120Ωbalanced line recommended for signal distribution.
The input to earth isolation is 3.5kV minimum.
The ITR is designed with balanced inputs and outputs which allow the use of twisted pair
cabling to distribute time synchronization signals and provide excellent noise immunity from
induced voltages in the noisy substation environment.
Fiber Inputs
The Fiber ITR types can take both a TTL copper input as well as a Fiber input signal. These
two signal sources are fed to a logic AND gate. The output of this AND gate is then used to
generate the ITR's Fiber signal and the Isolated copper output signals.
If both the copper and fiber inputs are used, the output is therefore the logical AND of the
two input signals. Usually only one input is used at a time, or the two inputs need to be
identical for meaningful outputs.
The fibre connection is ST Fiber, 62.5/125 um, λ = 820 nm, multi-mode. The receiver
sensitivity is -34.4 dBm.
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ITR Outputs
Typical input to Copper / Fiber output delays are 85±10nS.
Copper Loop Output
The copper loop output from the ITR is wired in parallel with the ITR's copper input. It is
therefore not electrically isolated from the copper input. Shorting the Term connection
terminals will add a 120Ω resistor across the copper input effectively terminating the copper
line.
Fiber Output
The Fiber output signal mirrors the input from either the copper input or Fibre input signal. If
both are present at the same time, then the Fiber output signal will be the logic AND of the
two signals.
The fiber output is 62.5/125 um, λ = 820 nm, multimode. Power is 17.5dB typical.
TTL Output
The TTL Output is a 0 to 5V Pk signal capable of driving up to 150mA loading. This output is
internally protected with a PTC resettable fuse.
RS422 /RS 485 Outputs
The RS422/RS485 output is ±5V, 50 x RS422 unit loads (RS485 Compatible).
RS 232 Output
The RS232 output is ±10V (typical unloaded) and capable of driving 15mA maximum.
MOSFET Output
The HV MOSFET option provides a 300Vdc (+0V tolerance), 100mA, high speed MOSFET,
fused with reverse polarity and ESD protection. The internal signal delay from input to HV
MOSFET output is 60uS typically.
Optional AM IRIG-B Output
The Optional AM IRIG-B output provides an Amplitude modulated IRIG-B output signal
nominally 8 V pk-pk with 120Ωoutput impedance.
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General User Guideline
The ITR should only be maintained by suitably qualified personnel.
The safety considerations outlined in the following installation guideline should be followed
and not compromised in any way. Fuses and protection devices should be replaced only with
the same rated components. Protective earths should not be disconnected or removed.
The ITR does not generate any high voltages, but instead may have one or more high
voltages fed to it as a power supply or for switching as is in the case of the HV MOSFET
option. The operator should familiarise themselves with how to isolate all voltages fed to the
ITR before working on it.
Once installed, the ITR requires no adjustments or setup. The unit has two LEDs that
indicate the power supply is present and an input signal is present.
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General Installation Guideline
Identification
Each ITR unit is shipped with an identification label on its side. This label provides details of
the ITR product code, the power supply requirement and serial number.
Check the identification label on the side of the unit to ensure that the correct model
has been supplied before proceeding to install!
Location
INSTALLATION ENCLOSURE
The ITR should be installed on a DIN rail in an enclosure which acts as a Fire
Enclosure and an Electrical Enclosure.
RESTRICTED ACCESS LOCATION
The ITR should be installed in a Restricted Access location, accessible only using a
lock and key or other means of security.
INSTALLATION PRACTICE
The ITR should be installed by suitably qualified personnel.
Wiring, cable entries, conduit entries, knock-outs or glands should be installed in
accordance with local wiring regulations.
Power Supply
The input voltage range is marked on the product label on the side of the ITR. Do
not apply voltage outside this range. Note that either supply polarity is
acceptable due to internal rectification.
OVERCURRENT PROTECTION –HV MOSFET
Circuit from an external supply to HV MOSFET connections on the ITR shall be
protected with 300 Vdc fuse rated at ≤ 1A.
OVERCURRENT PROTECTION - POWER
For the power supply protection fuse: -
•Use a slow blow fuse
•Calculated fuse current rating using formula: -
Fuse current rating = 𝐓𝐡𝐞 𝐥𝐞𝐬𝐬𝐞𝐫 𝐨𝐟 𝟏𝐀 𝐨𝐫 𝟏𝟎
𝑺𝒖𝒑𝒑𝒍𝒚 𝑽𝒐𝒍𝒕𝒂𝒈𝒆 Amps
Fuse voltage rating = At least the maximum supply voltage
For example, if using a 300V power supply, 10
300= 33mA so you would use
a 40mA (or above) slow blow fuse rated at or above 300V dc.
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Hazardous Voltage
HAZARDOUS VOLTAGE. Disconnect before working on product
DC supply voltage up to 300V, (+0V tolerance).
DUAL SUPPLY. Disconnect both supplies before working on the product
Hazardous voltage may be present on DC supply and PR-, HV-SW-, HV-SW+ and
PR+ terminals.
DISCONNECT DEVICE(S)
Each Hazardous Voltage circuit which connects to the ITR shall incorporate a
readily accessible disconnect device installed externally to the ITR.
Disconnect devices shall have contact separation of at least 3mm.
ITR Terminals
HAZARDOUS VOLTAGE. Stray conductors or loose connections.
Provide insulation and strain relief on all Hazardous Voltage terminations to
protect against electric shock hazard.
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The screw clamp terminals on the ITR accept 30 to 12 AWG solid or stranded
cable (1.5mm Ø max). Please ensure that wiring is terminated without exposing
bare copper wire.
Ensure all wiring to the ITR is done in a way so that if one screw termination
becomes loose then the wire will not be able to come in contact with other
terminals. Each individual wire requires a secondary fixing method.
This can be achieved by securing all three power wires together, (+, - and GND), and similarly
for the wiring to the HV MOSFET option secure up to 4 wires as required.
An example of one way to achieve this is to terminate individual wires into crimp pin
terminals (e.g. Multicomp MC29483) then heat shrink the crimped wires together, so they
support each other.
INSTALLATION ENCLOSURE
The ITR should be installed on a DIN rail in an enclosure which acts as a Fire
Enclosure and an Electrical Enclosure.
INSTALLATION PRACTICE
The ITR should be installed by suitably qualified personnel.
Wiring, cable entries, conduit entries, knock-outs or glands should be installed in
accordance with local wiring regulations.
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Earthing
PROTECTIVE EARTH
The unit must be safety earthed whenever it is powered on, using the GND
terminal as pictured above. The cable cross section must be equal to or greater
than 0.75 mm2 (18 AWG).
Warranty
For terms and conditions of Tekron’s Warranty see the Web Site
http://tekron.com/about-tekron/warranty
Contact
The ITR is manufactured in New Zealand by Tekron International Limited.
To contact Tekron please visit https://tekron.com/contact-us/
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