ORION ITALIA IPR-A2 User manual

O R I O N I T A L I A
INSTRUCTION MANUAL
IPR-A2
Current protection relay
Software rev.: IPR-A2 S2.01
Manual P/N: IPR-A2 GBM 30/06/2019
Via G. Orsi 35, 29122 Piacenza [PC] –Italia
Phone: + 39 0523 591161, Fax: + 39 0523 593898, Internet: www.orionitalia.com

CURRENT PROTECTION RELAY - IPR-A Manual P/N: IPR-A2 GBM 30/06/2019
SAFETY NORMS AND GENERAL WARNINGS
For a proper installation of the unit the technicians must read carefully and understand the
instructions provided by the Constructor.
All the installation operations must be carried out by suitably qualified technicians with
adequate knowledge of the unit and of the content of this manual.
1. Check that the installation room (spaces, segregation and environmental conditions) are suitable
for the electrical and electronic apparatus and in particular that:
•the room conditions are in compliance with the information contained in SPECIFICATION;
•the ratings of the unit (voltages, frequencies, etc.) are coherent with the features of the electric
system.
2. Make sure that the Standard and Legal requirements are followed during installation, service and
maintenance, in order to construct installations according to good technical and safety working
practices.
The unit must be used EXCLUSIVELY for the purposes described in the Chapter GENERAL
INFORMATION.
Disconnect the unit before carrying out any hipot testing on the installation.
Do not carry out any installation/maintenance operations requiring the disassembling and the removal
of the unit from the panel on which it is mounted when the unit is live: make sure it has been
disconnected.
SYMBOLS IN THE TEXT AND THEIR MEANINGS
It indicates an OBLIGATION, an operation that must be obligatory followed. Pay attention to the
information signalled by this symbol, as it refers to situations that require CAUTION AND WARNING: any
operations not in compliance with what is indicated could provoke damages to objects or people.
Pay particular ATTENTION to the parts indicated by this symbol: they are live.
It indicates a DANGER, a situation or operation requiring the MAXIMUM ATTENTION: any actions not in
compliance with what is indicated could provoke really serious damages to objects and even mortal injuries
to people.
It indicates INFORMATION or REMARKS that must be read with particular attention.
For any request please contact:
ORION ITALIA TECHNICAL ASSISTANCE
TEL: [phone] FAX: [phone] INTERNET: www.orionitalia.com

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I N D E X
1. GENERAL INFORMATION.................................................................................................1.1
1.1 Description.......................................................................................................................................................1.1
1.2 Applications.....................................................................................................................................................1.1
1.3 Protection and functionality...........................................................................................................................1.1
1.4 Digital measurement......................................................................................................................................1.3
1.5 Signalling and programming.........................................................................................................................1.3
1.6 Communication...............................................................................................................................................1.3
1.7 Specification....................................................................................................................................................1.3
1.8 Order code.......................................................................................................................................................1.6
2. INSTALLING............................................................................................................................2.1
2.1 Identification....................................................................................................................................................2.1
2.2 Unpacking........................................................................................................................................................2.1
2.3 Mounting..........................................................................................................................................................2.1
2.4 Wiring –output relay and digital inputs........................................................................................................2.2
2.5 Current transformers (CT).............................................................................................................................2.4
2.6 Circuit breaker status and control connections ..........................................................................................2.4
2.7 Communications.............................................................................................................................................2.4
2.8 Control power..................................................................................................................................................2.6
2.9 System grounding...........................................................................................................................................2.6
2.10 Hipot testing ....................................................................................................................................................2.6
3. HOW TO USE THE MENU..................................................................................................3.1
3.1 Menu structure................................................................................................................................................3.1
3.2 Menu access...................................................................................................................................................3.1
3.3 Menu surfing....................................................................................................................................................3.1
3.4 Selecting and storing keys............................................................................................................................3.1
3.5 Quick surfing guide.........................................................................................................................................3.2
3.6 Symbols used in the text ...............................................................................................................................3.2
3.7 Menu structure................................................................................................................................................3.3
3.8 How to use SETPOINTS and ACTUAL VALUES keys.............................................................................3.5
4. "SETPOINTS" MENU...........................................................................................................4.1
4.1 Setpoints page 1: SETPOINT ACCESS.................................................................................................4.1
4.1.1 Relationship between Function and Output Relay............................................................4.2
4.2 Setpoints page 2: SYSTEM SETUP........................................................................................................4.3
4.3 Setpoints page 3: Ph PROTECTIONS....................................................................................................4.5
4.4 Setpoints page 4: Gnd. PROTECTIONS................................................................................................4.7
4.5 Setpoints page 5: NOT AVAILABLE........................................................................................................4.8
4.6 Setpoints page 6: AUTORECLOSE.........................................................................................................4.9
4.7 Setpoints page 7: OUTPUT RELAYS................................................................................................... 4.11
4.8 Setpoints page 8: DIGITAL INPUTS..................................................................................................... 4.13
4.9 Setpoints page 9: EVENT RECORDER.............................................................................................. 4.13
4.10Setpoints page 10: DATE & TIME.........................................................................................................4.14
4.11Setpoints page 11: COMMUNICATIONS............................................................................................ 4.15
4.12Setpoints page 12: CALIBRATION MODE......................................................................................... 4.15

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5. MENU "ACTUAL VALUES" .............................................................................................. 5.1
5.1 Actual values 1: CURRENT DATA .......................................................................................................5.1
5.2 Actual values 2: LAST TRIP DATA.......................................................................................................5.1
5.3 Actual values 3: EVENTS........................................................................................................................ 5.2
5.4 Actual values 4: MAINTENANCE DATA.............................................................................................5.2
5.5 Actual values 5: AUTORECLOSE.........................................................................................................5.3
6. AUTOMATIC OPERATION................................................................................................ 6.1
6.1 Automatic operation condition...................................................................................................................... 6.1
7. EVENTS RECORDER.......................................................................................................... 7.1
7.1 Definition of “event” and storing................................................................................................................... 7.1
7.2 Events format..................................................................................................................................................7.1
8. TROUBLESHOOTING......................................................................................................... 8.1
9. WARRANTY............................................................................................................................ 9.1
APPENDIX A –Tables and time-current curves.............................................................A.1
ANSI curves..........................................................................................................................................................................A.2
IAC curves ............................................................................................................................................................................A.3
IEC curves ............................................................................................................................................................................A.4
Diagrams...............................................................................................................................................................................A.5

Chapter 1: General information
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1.1
1. General Information
1.1 DESCRIPTION
Thanks to the measuring of phase and ground currents by means of current transformers (CT), IPR-A current
protection relay can perform protection functions according to ANSI, IAC or IEC standards. Thanks also to the
indications at the digital inputs the device can inform for example about the status of circuit breaker or
disconnector to which it is coupled, operate on the outputs and disable some functions.
1.2 APPLICATIONS
•Primary or secondary protection for generation and distribution systems.
•Protection of transformers, overhead lines, cables, motors and generators.
•It allows the opening of the disconnector within the limits of its capacity, leaving the circuit interruption to the
back-up fuses in case of short-circuit.
1.3 PROTECTION AND FUNCTIONALITY
Description ANSI
•CT primary ratio selectable in 5 A steps (10 A 5000 A).
•Instantaneous phase overcurrent..................................................................................................................... 50
•Instantaneous ground overcurrent........................................................................................................50N / 50G
•Inverse-time phase overcurrent........................................................................................................................ 51
Inverse-time ground overcurrent ..........................................................................................................51N / 51G
Inverse-time negative sequence overcurrent ................................................................................................... 46
with curve selection according to ANSI, IAC or IEC/BS142:
- moderately inverse
- normally inverse
- very inverse
- extremely inverse
- definite time
•Autoreclosure................................................................................................................................................... 79
•Current Unbalance
•Overload alarm level
•KA accumulated per phase on circuit breaker interruption
•Integral relay test with or without the output contacts intervention
•1 trip relay
•3 auxiliary relays that can be associated with the various functions (2 programmable relays and 1 relay
controlling any loss of auxiliary voltage -SERVICE-).
Information
The following information concerns the use of the Actual values and the Setpoints.
OVERCURRENT PROTECTION
IPR-A continuously checks the 3 phase currents and the ground current in the line by means of its CTs and
activates an alarm and/or the circuit breaker trip when a value exceeds the set level (called Pickup level):
1. possibility of separately setting of the timed and instantaneous overcurrent;
2. no intrinsic delay of the device is added to the instantaneous intervention;
3. separate managing of the phase and ground overcurrent setpoints;
4. phase and ground overcurrent alarm and trip delay according to time-current curve set and to the entity of
current.

Chapter 1: General information
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1.2
The 5 selectable time-current curve shapes are the following:
- moderately inverse
- normally inverse
- very inverse
- extremely inverse
- definite time
The 3 programmed curve types are the following:
- ANSI
- IAC
- IEC / BS142
All curve shapes have a time multiplier (M) allowing modifying the trip time.
For the 3 possible curve types and their shapes see: →Appendix A
REMARK: when selecting the curve for the circuit breaker trip, make sure the max. input current to IPR-A
does not exceed 100 A for more than 1 second the wrong combination of time and current could
damage the unit and consequently provoke the loss of protection.

Chapter 1: General information
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1.3
1.4 DIGITAL MEASUREMENT
1. RMS current of each phase
2. Ground RMS current
1.5 SIGNALLING AND PROGRAMMING
•LCD & LED display indication
•Indication and storage of fault conditions and their values
•Indication on the system status
SYSTEM STATUS
LED
- circuit breaker or disconnector closed
[BREAKER CLOSED]
- circuit breaker or disconnector open
[BREAKER OPEN]
- circuit breaker or disconnector earthed
[BREAKER EARTHED]
- function ANSI 79 - Reclosure - active
[RECLOSURE ENABLED]
- function ANSI 79 - Reclosure –Reclosing in progress
[RECLOSURE IN PROGRESS]
- reaching of the inverse-time overcurrent pickup level
PICKUP I > (51)
- reaching of the instantaneous phase overcurrent pickup level
PICKUP I >> (50)
- reaching of the inverse-time ground overcurrent pickup level
PICKUP Io > (51N/G)
- reaching of the of the instantaneous ground overcurrent pickup level
PICKUP Io>> (50N/G)
•Indication of the relay status
RELAY STATUS
LED
- LED “On”: the output relay has tripped to open the circuit breaker or
disconnector. It stays “on” even when the output relay is programmed with
PULSED mode
- LED “Off”: it switches off when pressing RESET key only if the condition
causing the fault is no more present
[TRIP]
- intervention for reaching the phase or ground currents alarm setpoint
[ALARM]
- relay "out of service" due to internal fault
[OUT OF SERVICE]
1.6 COMMUNICATION
•Remote communication using a PC or a PLC by 2 RS485 ports or 1 RS232 port
•Local and remote setting of the relay protections and features
•Fault and event recorder for statistical analysis
•Self-explicative program requiring no additional programming
•Remote opening or closing of the circuit breaker or disconnector
1.7 SPECIFICATION
SUPPLY VOLTAGE
24÷310 Vdc, –15%, +10%
24÷240 Vac, –15%, +10%, 50/60Hz
POWER CONSUMPTION
7W, 12 VA (max)
TEMPERATURE RANGES
Operational: from 0 °C to +50 °C
Storage: from –20 °C to + 70 °C
RELATIVE HUMIDITY
Max.: 90% (non condensing)

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1.4
DIELECTRIC WITHSTAND VOLTAGE
2 KV 60 s
BURN IN
48 hours at 50 °C
ENVIRONMENTAL FEATURES
The relay must be installed in a room with the following
features:
- indoor,
- dry, not dusty and not corrosive atmosphere.
CONSTRUCTION
In compliance with VDE, UL, CEI standards.
OUTPUT CONTACT
Load: resistive (p.f.= 1)
inductive (p.f.= 0.4; L/R = 7 ms)
Rated load: 250 Vac, 8 A or 30 Vcc, 8 A with p.f.=1
250 Vac, 5 A or 30 Vcc, 5 A with p.f.=0.4
Max. operating Voltage: 250 Vac, 125 Vcc
Max. operating Current: 8 A
Capacity: 2000 VA, 240 W with p.f.=1
1250 VA, 150 W with p.f.=0.4
DIGITAL INPUT
Type: Dry contacts
Output: 24 Vdc, 10 mA (stabilized)
LED INDICATORS
Relay status: Trip, Alarm, Service
System status: Closed circuit breaker, open circuit
breaker, earthed circuit breaker,
reclosure enabled, reclosure in
progress and reaching of:
Pickup level I > (51)
Pickup level I >> (50)
Pickup level I0 > (51N/G)
Pickup level I0 >> (50N/G)
Display (LCD): 16 x 2 digits
Display accuracy: Load current: 1% @ 100% CT
COMMUNICATIONS
Type: 1 4-wire RS232 port + 2 2-wire RS485
ports, Full duplex, 1200÷19200 baud
Protocol: Modbus RTU
Functions: Reading/Writing of setpoints
Reading of actual values
Executing of commands
TERMINAL BLOCK
Fixed, for cables with section: 4 mm2(12 AWG).
FRAME
Auto-extinguishing ABS with frontal in polycarbonate (IP54).
MOUNTING
The relay has to be jointed to the structure fixing it by stirrup
with screws.
DIMENSION
144 x 144 x 141 mm (→Fig. 2.1 –IPR-A overall dimensions)
FRONT PANEL CUT-OUT
137 x 137 mm
WEIGHT
1.5 Kg
APPLICABILITY
System: three-phase;
Frequency: 50 and 60 Hz;
Current: max. 5000 A;
Voltage: max. 69 kV
PHASE AND GROUND CT INPUTS
Secondary rated current: CT: 1 A or 5 A (specify with order).
Sampling: True RMS at 16 samples per
cycle.
Bandwidth: 0÷100 Hz
CT burden: 0.25 VA per phase at rated
secondary current.
Continuous: 10 A
Current withstand capacity: 100 A per 1 s
OVERCURRENT CURVES
Selection of phase and ground curves according to ANSI, IAC
or IEC.
•Moderately inverse
•Normally inverse
•Extremely inverse
•Definite time
The curves are valid up to 18 times the CT rated current
INVERSE-TIME PHASE OVERCURRENT
(51)
Pickup level: 4÷300% CT, Steps: 1%
Time multiplier: 0.1÷20.0; Steps: 0.1
Dropout level: Time resets to zero whenever
current level drops below the pickup
level.
Accuracy: ± 3% of the setting.
Delay: included in ± 3% or in ±20 ms, per
>150% of pickup level.
INSTANTANEOUS OVERCURRENT
(50)
Pickup level: 4÷1800% of CT, Steps: 10%
Current accuracy: ± 3% of the setting
Time accuracy: 35 ms max. per > 150% of the set
value
Saturation: 18 times the CT rated current.

Chapter 1: General information
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1.5
INVERSE-TIME GROUND OVERCURRENT
(51G/51N)
Pickup level: 4÷300% CT, Steps: 1%
Time multiplier: 0.1÷20.0; Steps: 0.1
Dropout level: Time resets to zero whenever
current level drops below the pickup
level.
Current accuracy: ± 3% of the setting.
Time accuracy: included in ± 3% or in ±20 ms, per
>150% of the set value.
GROUND INSTANTANEOUS OVERCURRENT
(50G/50N)
Pickup level: 4÷1800% of CT, Steps: 10%
Current accuracy: ± 3% of the set value.
Time accuracy: 35 ms max. per > 150% of the set
pickup level.
Saturation: 18 times the CT rated current.
NEGATIVE SEQUENCE TIME OVERCURRENT
(46)
Pickup level: 4÷300% CT, Steps: 1%
Time multiplier: 0.1÷20.0; Steps: 0.1
Dropout level: 97% Ipk
Accuracy: ± 3% of the setting.
Def. Time accuracy: included in ±3% or in ±60 ms
(whichever is greater), at I >150% Ipk.
AUTOMATIC RECLOSURE
(79)
Programmable fast and/or slow autoreclose for protection of:
phase time overcurrent ANSI 51
phase instantaneous ANSI 50
ground time overcurrent ANSI 51G/51N
ground inst. overcurrent ANSI 50G/50N
Dead time 1st shot: 0.1÷600.0 s in steps of 0.1/1 s
Dead time 2nd shot: 0.1÷600.0 s in steps of 0.1/1 s
Reset time: 1÷999 s, in steps of 1 sec.
Block time after
manual closure: 1÷999 s, in steps of 1 sec.
CURRENT UNBALANCE
Pickup: 1÷99%, Steps: 1%
Delay: 0.05÷600 s, Steps: 0.01/0,1/1 s
Current accuracy: ±3% of set current at I>6%CT
Time accuracy: ±3% of trip time or ± 40ms (whichever
is greater)
EMISSIONS TEST
1. Radiated emissions
Reference norms: EN 55011;
Port: enclosure.
2. Conducted emissions
Reference norms: EN 55011;
Port: AC mains.
IMMUNITY TESTS
1. Conducted disturbances induced by RFfield
Reference norms: EN 61000-4-6;
Port: AC mains and signal lines.
2. Radiated electromagnetic field
Reference norms: EN 61000-4-3; ENV 50204;
Port: enclosure.
3. Electrostatic discharge
Reference norms: EN 61000-4-2;
Port: enclosure.
4. Fast transients
Reference norms: EN 61000-4-4;
Port: AC mains and signal lines.
5. Surge
Reference norms: EN 61000-4-5;
Port: AC mains.
6. Voltage dips and short interruptions
Reference norms: EN 61000-4-11;
Port: AC mains.

Chapter 1: General information
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1.6
1.8 ORDER CODE
The CT secondary must be specified when ordering (1 A or 5 A).
The meaning of the order code is the following:
IPR –A X X X
PHASE SECONDARY CT
1: 1 Ampere
5: 5 Ampere
GROUND SECONDARY CT
1: 1 Ampere
5: 5 Ampere
MODEL
1: Standard version
2: Standard version + ANSI 79, 46 functions

Chapter 2: Installing
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2.1
2. Installing
2.1 IDENTIFICATION
On the plate on the rear side of the IPR-A you can find the following information:
ORION ITALIA Manufacturer
PIACENZA 29100 Manufacturer’s address
TEL.: [phone]
FAX: [phone]
www.orionitalia.com Web Site
MADE IN ITALY
MODEL: IPR-A Model name
SERIAL No. Serial number of the relay
MFG. DATE Date of manufacture
CURRENT CTs (SEC) Phase CT installed: 1 A or 5 A
GROUNG CTs (SEC) Ground CT installed: 1 A or 5 A
2.2 UNPACKING
The shipping container includes:
- IPR-A relay
- the fixing elements
- this instruction manual
- the Test certificate (if required)
As soon as you receive the unit, inspect it and inform ORION ITALIA of any damage.
If reshipment is required, the original container and packing should be used.
2.3 MOUNTING
The mounting should be carried out as follows:
1. Install the relay in a place where the humidity and temperature are those for which it has been designed [→§
1.7 –“Specification”] and away from current conductors and sources of strong magnetic fields.
2. Put the relay inside a panel and place it so that the keypad is easily accessible and the display is visible.
3. Make a cutout in the panelboard of 137 x 137 mm [→Fig. 2.1] and fix the relay by using the fixing elements
provided with the relay.
Figure 2.1 –IPR-A overall dimensions
FRONT VIEW
SIDE VIEW
REAR VIEW
PANEL CUTOUT

Chapter 2: Installing
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2.2
2.4 WIRING –OUTPUT RELAY AND DIGITAL INPUTS
Before carrying out the installation of the unit, it is necessary to read and understand the
indications provided by the Constructor.
All the installation operations must be carried out by qualified personnel with adequate
knowledge of the functioning of the unit and of the content of this manual.
Terminal blocks in the rear side of the unit make the electrical connections.
DIGITAL INPUT
TERMINALS No.
DIGITAL INPUT 1
DIGITAL INPUT 2
DIGITAL INPUT 3
BREAKER STATUS
17 –18
19 –20
21 –22
23 –24
NOTE: In order to perfom the Autoreclosure
function (ANSI 79), the terminals #23 and
#24 must be connected.
Figure 2.2 –Rear view
The 4 output relays on the IPR-A are the following:
Relay
Type
Note
Terminals
TRIP
N.O.
Programmable: “pulsed” or “latched”
1 - 2
AUX1
N.O.
Programmable: “pulsed” or “latched”
3 - 4
AUX2
N.O.
Programmable: “pulsed” or “latched”
5 - 6
AUX 3 - SERVICE
N.C.
Programmable: “pulsed” or “latched”
[if set as SERVICE: used for signalling any control power drop or internal
fault]
7 - 8
•In Fig. 2.3 the relays contacts are represented in condition of no power supply.
•Generally, the circuit breaker AUX 52a contact is connected in series to IPR-A TRIP contact for cutting the
current to the coil. For high-absorption trip coils an auxiliary relay is needed.
•The service contact is failsafe: it reacts in case of control power drop or of internal fault of the unit. The contact
is N.C.. Connect the SERVICE relay to an external alarm system. For configuring AUX3 relay as a service
relay: →"Setpoint Page 2 - OUT OF SERVICE ON AUX3".
The digital inputs must be connected only to dry-contact circuits so as to avoid damaging the IPR-A.
No external voltage should be applied to the corresponding terminals as they are internally energized
from the IPR-A and opto-coupled to the sensing circuitry.
Digital outputs should be isolated from each other for correct operation. The maximum input impedance
to these digital outputs is 2 k.
The power supply must be connected to terminals 32 and 34.
For further information: →§ 1.7 –"Specification"

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2.3
COLLEGAMENTO TOROIDE
SEQUENZA ZERO
ZERO SEQUENCE GROUND
CONNECTION
1
2
3
4
5
6
7
8
TRIP
AUX 1
AUX 2
AUX 3
SERVICE
CURRENT
SBARRE DI TERRA
QUADRO ELETTRICO
SWITCHGEAR
GROUND BUS
2>tx
3>rx
5>Gnd
COLLEGAMENTO RESIDUO
DI TERRA
RESIDUAL GROUND CONNECTION
1A o 5A SECONDARIO TC
1A or 5A SECONDARY CTS
CURRENT
Ia-r
Ia Ib Ib-r Ic Ic-r In In-r
25r
25 26 26r 27 27r 29 30
COLLEGAMENTO CON
DUE TOROIDI
2 CTs CONNECTION
MODALITA DI COLLEGAMENTO CON TOROIDI
CURRENT TRANSFORMER CONNECTIONS TYPES
CURRENT
Ia-r
Ia Ib Ib-r Ic Ic-r In In-r
25r
25 26 26r 27 27r 29 30
LINEA
LINE
A
B
C
FILTER
GROUND
SAFETY
GROUND
25r
25
26
26r
27
30
27r
29
Ia-r
Ia
Ib
Ib-r
Ic
Ic-r
In
In-r
31 32 33 34
24 - 240 Vac/Vdc
ALIMENTAZIONE
MODELLO UNIVERSALE
CONTROL POWER
UNIVERSAL TYPE
ENTRATA DEI CONTATTI SECCHI
DRY CONTACT SWITCH INPUTS
DI1 DI2 DI3 BREAKER
STATUS
21 22 23 24
17 18 19 20
13
14
15
16
+
-RS485
RS-485
DEVICE 1
PLC/
COMPUTER
GND
+
-
COM2
COM3
RS-485
DEVICE 2
RS-232
PORT
1
6
5
9
IPR-A
Figure 2.3 –Wiring diagram

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2.4
2.5 CURRENT TRANSFORMERS (CT)
CTs with 1 A or di 5 A secondary rated current must be used for current sensing. The choice of the CTs
performances must ensure a sufficient power and the non-saturation in case of short circuit.
The 3 or 4 transformers providing a current that is proportional to the phase or ground current must be connected
to terminals from no. 25 to no. 30 [→Fig. 2.3].
Normally IPR-A uses the “RESIDUAL GROUND CONNECTION” [→Fig. 2.3] to sense ground current.
When using shielded wires (using the 4th Zero Sequence toroid), if the shield passes through the CT, the
conductor earthing the shield must pass again through the CT window in the opposite direction in order to nullify
any contribution of the shield in the calculation of the current to ground [→Fig. 2.4].
Figure 2.4 –Cable shield
Observe correct polarity when connecting the CTs to the relay. The CT secondary marked terminal (usually with
the S1 mark on it) must be connected to the relay terminal marked with Ia, Ib or Ic. Each CT should have the
same orientation and the points identifying the magnetic directions must be connected as shown in Fig. 2.3.
2.6 CIRCUIT BREAKER STATUS AND CONTROL CONNECTIONS
Connect the circuit breaker AUX 52a/52b contacts to terminals 23 and 24 to display the circuit breaker status on
IPR-A.
2.7 COMMUNICATIONS
Thanks to the serial ports, a PC or PLC can make the monitoring and controlling of the relay.
Two-wire RS485 port 1 conductors pair transmitting and receiving alternatively is used for the data TX and
RX.
The ports CANNOT be used at the same time.
The serial port protocol is a subset of the AEG Modicon Modbus protocol.
For the RS-485 port use shielded, twisted-pair connecting wires to minimize communications errors
from noise.
A suitable type of wire is:
BELDEN#9841 AWG 24 shielded and with an impedance of 120 .
Ground the shield at one point only [→Fig. 2.3] to avoid ground loops.
Correct polarity for RS485 →Figure 2.5
The connections are cascade-type and end on the converter. Avoid star or loop connections.
A maximum of 32 relays can be daisy-chained together in parallel mode on a communication channel for a
MAXIMUM DISTANCE OF 1000 METERS.
b) Cable shielded
a) Cable not shielded
POWER SUPPLY
POWER SUPPLY
LOAD
LOAD
grounding

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2.5
For increasing the number of relays on a single channel to more than 32 refer to ORION ITALIA.
Figure 2.5 –Communications diagram

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2.6
2.8 CONTROL POWER
•Voltage ranges for IPR-A............................................................................................................................20 ÷ 341 Vdc
20 ÷ 264 Vac
•Power supply connection terminals ................................................................................................................32 and 34.
No internal or external adjustments are required to use any of the voltages included in the two
indicated intervals.
For the external protection, IPR-A has no internal fuses.
2.9 SYSTEM GROUNDING
On the rear side of the relay there are two separate grounds [→Fig. 2.2]:
•Internal metal chassis parts and external shield safety ground terminal.................................................................31
•Surge suppression components ground terminal (grounded to separate filter ground)........................................33
For reliable operation both grounds must be connected directly to the ground bus bars of the switchgear. Do not
connect the ground connection to the switchgear metal frame because low impedance to ground cannot be
guaranteed.
2.10 HIPOT TESTING
Hipot testing carried out by the Manufacturer:
•Voltage.....................................................................................................................................................2000 Vac, 50 Hz
•Time (under voltage)...........................................................................................................................................1 minute
Disconnect the communication terminals and filter ground during dielectric strength testing (hipot) or
damages to the internal surge protection devices may occur.
If hipot testing is to be performed on an installed relay for insulation verification, all remaining terminals except for:
•Safety ground terminal + external shield......................................................................................................................31
•Surge suppression components ground terminal (grounded to separate filter ground)........................................33
should be connected in parallel.

Chapter 3: How to use the menu
CURRENT PROTECTION RELAY - IPR-A Manual P/N: IPR-A2 GBM 30/06/2019
3.1
3. How to use the menu
3.1 MENU STRUCTURE
IPR-A menu is a tree-structure type, consisting of:
•PAGE →function access;
•LINE →for each PAGE.
3.2 MENU ACCESS
You can have access to the menu by pressing one of the following keys:
SET POINTS It activates the menu for setting functions and variables.
ACTUAL VALUES It activates the menu for selecting the actual values to be displayed.
3.3 MENU SURFING
For menu surfing, use one of the following keys:
▲PAGE Next PAGE.
▼PAGE Previous PAGE.
LINE Next LINE in the actual PAGE.
3.4 SELECTING AND STORING KEYS
Use the following keys for selecting and storing data:
▲VALUE For scanning the values or the options to the end of the actual range.
▼VALUE For scanning the values or the options to the beginning of the actual range.
STORE •For storing the newly entered data.
•It requires the entering of the access code (111).
•It switches the keypad operation mode for entering the
digits (1 to 9) positioned as shown in the figure.
PROG key is positioned on the back of the relay. It can
be used to enter new data in SETPOINTS or ACTUAL
VALUES menu (range: YES/NO) without entering the
access code.
Press PROG key instead of: ENTER ACCESS CODE + STORE Key
I P R - A C U R R E N T P R O T E C T I O N R E L A Y

Chapter 3: How to use the menu
CURRENT PROTECTION RELAY - IPR-A Manual P/N: IPR-A2 GBM 30/06/2019
3.2
3.5 QUICK SURFING GUIDE
The operation mode of the PAGE, LINE, VALUE and STORE keys is described in details only in the description
of the PAGE 1 of the SETPOINT Menu. As the mode for surfing is the same in the other pages, the use of these
keys, starting from the second PAGE of the Menu, will not be repeated.
The following summary is intended to be a QUICK SURFING GUIDE:
PAGE: these two keys allow going from one PAGE to the next one [▲] or to the previous one [▼].
LINE: this key allows going from one SETPOINT to the next inside the same PAGE. At the last SETPOINT of
the PAGE, it allows to go to the next PAGE.
VALUE: these two keys allow to select range values, decreasing [▼] or increasing [▲], or to select two or more
options [for example NO and YES].
STORE: this key allows to store the data and to enter the access code.
Any modifying not confirmed by STORE will be ignored.
3.6 SYMBOLS USED IN THE TEXT
The IPR-A display is represented by this figure.
Next to each Setpoint, on the right side of the display, “RANGE:” will be displayed and followed by digits or
options separated by the following symbols:
Symbol
Meaning
;
You can select only among the elements of the list that are all clearly listed and separated by the
“semi-colon”.

You can select among all values included in the limits indicated.
FOR EXAMPLE:
RANGE: 2; 3; 6 you can select only one of the three digits: 2, or 3, or 6.
RANGE: 2 6 you can select 2, or 3, or 4, or 5, or 6.
In the SETPOINT Pages (except for PAGE 1), the value indicated in this manual in the 2nd line of the
display has been set by the Manufacturer of the relay.
This symbol indicates the key that must be pressed.
✓