Circutor RGU-100A User manual

INSTRUCTION MANUAL
Protection and monitoring relay
RGU-10A, RGU-100A
(M359B01-03-23B)

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RGU-10A , RGU-100A
Instruction Manual

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Instruction Manual
RGU-10A, RGU-100A
SAFETY PRECAUTIONS
DANGER
Warns of a risk, which could result in personal injury or material damage.
ATTENTION
Indicates that special attention should be paid to a specific point.
Follow the warnings described in this manual with the symbols shown below.
If you must handle the unit for its installation, start-up or maintenance, the following should be
taken into consideration:
Incorrect handling or installation of the device may result in injury to personnel as well as damage to
the device. In particular, handling with voltages applied may result in electric shock, which may cause
death or serious injury to personnel. Defective installation or maintenance may also lead to the risk of
fire.
Read the manual carefully prior to connecting the device. Follow all installation and maintenance in-
structions throughout the device’s working life. Pay special attention to the installation standards of
the National Electrical Code.
Refer to the instruction manual before using the device
In this manual, if the instructions marked with this symbol are not respected or carried out correctly, it can result
in injury or damage to the device and/or installations.
CIRCUTOR S.A.U. reserves the right to modify features or the product manual without prior notification.
DISCLAIMER
CIRCUTOR S.A.U. reserves the right to make modifications to the device or the unit specifications set
out in this instruction manual without prior notice.
CIRCUTOR S.A.U. on its web site, supplies its customers with the latest versions of the device specifi-
cations and the most updated manuals.
www.circutor.com
CIRCUTOR S.A.U. recommends using the original cables and accessories that are sup-
plied with the device.

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RGU-10A , RGU-100A
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CONTENTS
SAFETY PRECAUTIONS .........................................................................................................................................................3
DISCLAIMER ..........................................................................................................................................................................3
CONTENTS.............................................................................................................................................................................4
REVISION LOG .......................................................................................................................................................................6
SYMBOLS...............................................................................................................................................................................6
1. VERIFICATION UPON RECEPTION.................................................................................................................................... 7
2  PRODUCT DESCRIPTION .................................................................................................................................................7
3. INSTALLATION OF THE DEVICE .......................................................................................................................................8
3.1 - PRELIMINARY RECOMMENDATIONS.........................................................................................................................8
3.2.- INSTALLATION .........................................................................................................................................................8
3.3 - PANEL MOUNTING ACCESSORY (72 x 72 mm).........................................................................................................9
3.4 - DEVICE TERMINALS ............................................................................................................................................... 10
3.4.1. RGU10A ........................................................................................................................................................... 10
3.4.2. RGU100A..........................................................................................................................................................11
3.5 - WGC TRANSFORMERS.............................................................................................................................................11
3.5.1 PANEL INSTALLATION.........................................................................................................................................11
3.5.2 INSTALLATION ON A DIN RAIL........................................................................................................................... 12
3.5.3 DISTRIBUTION OF THE CONDUCTORS IN THE WGC ......................................................................................... 13
3.6 - CONNECTION DIAGRAMS....................................................................................................................................... 15
3.6.1 CONNECTION WITH EMISSION COIL................................................................................................................... 15
3.6.2 CONNECTION WITH UNDERVOLTAGE COIL ........................................................................................................ 16
4. OPERATION ................................................................................................................................................................... 17
4.1 - PRINCIPLE OF OPERATION ..................................................................................................................................... 17
4.2 - LED INDICATORS .................................................................................................................................................... 17
4.3 - DISPLAY ................................................................................................................................................................. 18
4.4 - KEYBOARD FUNCTIONS ......................................................................................................................................... 19
4.5 - RELAY.....................................................................................................................................................................20
4.6 - DIGITAL INPUT .......................................................................................................................................................20
5  DISPLAY.........................................................................................................................................................................22
5.1 - DISPLAY SCREENS..................................................................................................................................................22
5.2 - TRIP DISPLAY SCREENS.........................................................................................................................................23
5.3 - TEST SCREEN.........................................................................................................................................................24
5.4 - LOCK ......................................................................................................................................................................24
5.5 - ERROR SCREEN......................................................................................................................................................25
6. DIRECT ADJUSTMENTS.................................................................................................................................................26
6.1 - TRIP CURRENT .......................................................................................................................................................26
6.2 - DELAY AND RELAY CURVE..................................................................................................................................... 27
7. CONFIGURATION............................................................................................................................................................28
7.1 - PRE-ALARM RELAY.................................................................................................................................................28
7.1.1 - PREALARM CURRENT.....................................................................................................................................29
7.1.2 - DELAY OF THE PREALARM RELAY .................................................................................................................30
7.1.3 - PREALARM OPERATION.................................................................................................................................30
7.1.4.- POLARITY ........................................................................................................................................................ 31
7.2.- TRIP RELAY ............................................................................................................................................................ 31
7.2.1 - POLARITY.........................................................................................................................................................32
7.2.2 - TRIP CURRENT LIMIT .......................................................................................................................................32
7.3.- COMMUNICATIONS.................................................................................................................................................33
7.3.1.- PERIPHERAL NUMBER ....................................................................................................................................33
7.3.2.- BAUD RATE......................................................................................................................................................34
7.3.3.- DATA BITS/PARITY/STOP BIT ......................................................................................................................34
8. RGU100A: RS485 COMMUNICATIONS .......................................................................................................................36
8.1.- CONNECTIONS .......................................................................................................................................................36
8.2.- MODBUS PROTOCOL..............................................................................................................................................36
8.3.- MODBUS COMMANDS ...........................................................................................................................................37
8.3.1.- VARIABLES OF THE DEVICE ............................................................................................................................37
8.3.2.- TRIPPING DUE TO TEST OR COMMUNICATIONS ............................................................................................38
8.3.3.- DEVICE CONFIGURATION VARIABLES ............................................................................................................38
9 TECHNICAL FEATURES...................................................................................................................................................40
9.1 - RGU-10A/ RGU-100A ............................................................................................................................................40

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9.2 - WGC ......................................................................................................................................................................42
10  MAINTENANCE AND TECHNICAL SERVICE..................................................................................................................46
11. GUARANTEE .................................................................................................................................................................46
12  EU DECLARATION OF CONFORMITY............................................................................................................................47
ANNEX A  DIRECT SETTINGS............................................................................................................................................ 50
ANNEX B  SETUP MENU.................................................................................................................................................... 51

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RGU-10A , RGU-100A
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REVISION LOG
Table 1: Revision log.
Date Revision Description
11/22 M359B01-03-22A First Version
01/23 M359B01-03-23A Changes in the following sections:
8.1.
03/23 M359B01-03-23B Changes in the following sections:
2.- 3.4.2.- 7.- 7.3.- 8.- 9. - Annex A - Annex B
Note: The images of the devices are for illustrative purposes only and may differ from the original
device.
SYMBOLS
Table 2: Symbols.
Symbol Description
In accordance with the relevant European directive.
Device covered by European Directive 2012/19/EC. At the end of its useful life, do not discard of
the device in a household refuse bin. Follow local regulations on electronic equipment recycling.
Direct current.
~Alternating current.

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RGU-10A, RGU-100A
1. VERIFICATION UPON RECEPTION
Upon receipt of the device, check the following points:
a) The device meets the specifications described in your order.
b) The device has not sustained any damage during transport.
c) Perform an external visual inspection of the device prior to switching it on.
d) Check that it has been delivered with the following:
- An installation guide,
If any problem is noticed upon reception, immediately contact the transport com-
pany and/or CIRCUTOR's after-sales service.
2  PRODUCT DESCRIPTION
The RGU-10A /RGU-100A is a type-A ultraimmunised earth leakage protection and monitoring relay
that is compatible with the earth leakage transformers in the WGC range.
The device features:
- Display for showing the parameters.
- 3 keys to browse through the different screens and program the device.
- 2 relays: a tripping relay and a pre-alarm relay.
- Digital test or remote control inputs (TRIP/RESET).
- 3 DIN rail modules, panel installation with front accessory.
- RS-485 communications, available on the RGU-100A model.
The WGC is a range of electronic, type A earth leakage protection and measuring transformers.
CIRCUTOR offers 12 models with transformers of different sizes.

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RGU-10A , RGU-100A
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3. INSTALLATION OF THE DEVICE
3.1 - PRELIMINARY RECOMMENDATIONS
In order to use the device safely, personnel operating it must follow the safety meas-
ures that comply with the standards of the country where it is to be installed; operators
must wear the required personal protective equipment (rubber gloves, approved facial
protection and flame-resistant clothing) to prevent injuries from electric shock or arcs
caused by exposure to current-carrying conductors, and they must heed the various
warnings indicated in this instruction manual.
The RGU-10A/RGU-100A device must be installed by authorised and qualified staff.
The power supply plug must be disconnected and measurement systems switched off before handling,
altering the connections or replacing the device. It is dangerous to handle the device while it is pow-
ered.
Cables must always be kept in perfect condition to avoid accidents or injury to personnel or installa-
tions.
Restrict the operation of the device to the specified measurement category, voltage or current values.
The manufacturer of the device is not responsible for any damage resulting from failure by the user
or installer to heed the warnings and/or recommendations set out in this manual, nor for damage
resulting from the use of non-original products or accessories or those made by other manufacturers.
Do not use the device to take any measurements if an anomaly or malfunction is detected.
Check the surrounding environment before starting to take measurements. Do not take any measure-
ments in hazardous or explosive environments.
Before carrying out maintenance or repairs, or handling any of the device's connections,
the device must be disconnected from all power sources, both from the device's own
power supply and the measurement's.
Contact the after-sales service if you notice that the device is not working properly.
3.2.- INSTALLATION
When the device is on, its terminals, opening covers or removing elements may ex-
pose the user to parts that are hazardous to touch. Do not use the device until it is
fully installed.
The device must be installed inside an electric panel or enclosure with DIN rail mounting (IEC 60715).
Note: Follow the instructions in Figure 1 to correctly install the device on the DIN rail.

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RGU-10A, RGU-100A
1
2
Figure 1:Installing the RGU-10A on the DIN rail.
The device has a LED (CPU) that indicates voltage presence. Even if the aforemen-
tioned LED is off, the user still needs to verify that the device is disconnected from
any power supply.
The RGU-10A/RGU-100A has to be connected to a power circuit that is protected with a circuit-break-
er or equivalent device to disconnect the device from the mains supply.
3.3 - PANEL MOUNTING ACCESSORY (72 x 72 mm)
Note: The 72 x 72 mm panel mounting accessory is sold separately.
CIRCUTOR has a panel mounting accessory for the RGU-10A /RGU-100A device so that it can be in-
stalled on 72 x 72 mm panels.
Figure 2 shows the installation of the panel mounting accessory to the RGU-10A /RGU-100A.
Disconnect all power supplies and measuring equipment from the device before in-
stalling the panel mounting accessory.
Figure 2: Installation of the panel mounting accessory.


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Table 3: Technical features.
Technical features
Protection degree IP40
Enclosure Self-extinguishing V0 plastic
68 mm
68 mm
Figure 3: Panel cut-out.
3.4 - DEVICE TERMINALS
3.4.1. RGU10A
A2
A1
1
2
3
4
5
6
7
8
19
20
Figure 4: Terminals of the RGU-10A: Upper - Lower.
Table 4: List of RGU-10A terminals.
Device terminals
A1: A1, Power supply 5: R2, Pre-alarm relay (NC)
A2: A2, Power supply 6: C2, Pre-alarm relay (Common)
1: R1, Trip relay (NO) 7: 1S1, Transformer connection WGC
2: R1, Trip relay (NC) 8: 1S2, Transformer connection WGC
3: C1, Trip relay (Common) 19: TRIP/RESET,Input for trigger or external reset
4: R2, Pre-alarm relay (NO) 20: TRIP/RESET,Input for trigger or external eset

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RGU-10A, RGU-100A
3.4.2. RGU100A
A2
A1
1
2
3
4
5
6
7
8
19
20
22
23
24
Figure 5: Terminals of the RGU-100A: Upper - Lower.
Table 5: List of RGU-100A terminals.
Device terminals
A1: A1, Power supply 7: 1S1, Transformer connection WGC
A2: A2, Power supply 8: 1S2, Transformer connection WGC
1: R1, Trip relay (NO) 19: TRIP/RESET,Input for trigger or external reset
2: R1, Trip relay (NC) 20: TRIP/RESET,Input for trigger or external eset
3: C1, Trip relay (Common) 22: S, GND for RS-485
4: R2, Pre-alarm relay (NO) 23: B-, RS-485
5: R2, Pre-alarm relay (NC) 24: A+, RS-485
6: C2, Pre-alarm relay (Common)
3.5 - WGC TRANSFORMERS
The transformer is designed for wall-mounting or DIN-rail assembly with an accessory for installation.
The WGC is a feed-thru busbar type transformer, where the conductor cables to be measured must
pass through the inner hole or window of the transformer.
3.5.1 PANEL INSTALLATION
For panel installation, 4 clamping clips are provided with the transformer, see Figure 6.
Figure 6: Clamping clip.
The clamping clips must be installed on the WGC, as shown in Figure 7.

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Figure 7: Position of the clamping clips.
3.5.2 INSTALLATION ON A DIN RAIL
For installation on a DIN rail, two support brackets are provided with the device, see Figure 8.
Figure 8: WGC support brackets.
The steps to ensure proper installation are:
1 - Install the brackets in the WGC, Step 1 in Figure 9.
2 - Install the WGC on the DIN rail, Step 2 in Figure 9.
Step 1
Step 2
Figure 9: Installing a WGC on the DIN rail.

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3.5.3 DISTRIBUTION OF THE CONDUCTORS IN THE WGC
All the active conductors that feed the loads or part of the installation where earth leakage protection
or monitoring is required must pass through the WGC transformer associated with the RGU-10A /
RGU-100A.
Active conductors are defined as the phases (L1, L2 and L3) and neutral. Never the protection cable
(PE or Earth) (Figure 10).
PE
N
L1
L3L2
Figure 10:Distribution of the conductors.
Routing the Earth cable (PE) and the rest of the active conductors through the
transformer disables earth leakage current measurement, and earth leakage
protection and motorisation consequently cease to function.
In the event of having to route a cable hose containing all the conductors, including the earth con-
ductor (PE), the PE conductor must be routed in the opposite direction to counteract the effects of its
original path, see Figure 10.
N
L1
L3L2
PE
Figure 11:Conductor distribution (cable hose).
Conductor routing must be neat, centred and separated from the transformer’s inner opening, Figure 12.
L1
L3
L2
N
Figure 12:Correct distribution of conductors.
The inadequate arrangement of the conductors, as shown in Figure 13, as well as not
following the recommendations indicated in Figure 14,can cause the transformer
to lose its measurement efficiency and residual current protection. Unexpected
disconnections may occur in the installation if the WGC is associated to a differential
relay that actuates the circuit breaker.

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Instruction Manual
L1
N
L3
L2
N
L2
L1
L3
Figure 13:Incorrect distribution of conductors.
The elbows of the conductors passing through the WGC must be avoided, both at inlet (before feed-
through) and outlet (after feed-through),Figure 14.
L
L
L>
Figure 14:Avoid elbows in conductors.

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RGU-10A, RGU-100A
3.6 - CONNECTION DIAGRAMS
3.6.1 CONNECTION WITH EMISSION COIL
Alimentación Auxiliar
Power Supply
TRIP/RESET
6
2 3 451
U >
CARGA
LOAD
L1 L2 L3 N
1S2 1S1
1S2
1S1
WGC
R2
R1
78 19 20
A2
A1
Figure 15: Connection diagram with emission coil.

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Instruction Manual
3.6.2 CONNECTION WITH UNDERVOLTAGE COIL
Alimentación Auxiliar
Power Supply
TRIP/RESET
U <
CARGA
LOAD
L1 L2 L3 N
1S2 1S1
1S2
1S1
WGC
78 19 20
A2
A1
6
2 3 451
R2
R1
Figure 16: Connection diagram with undervoltage coil.

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RGU-10A, RGU-100A
4. OPERATION
4.1 - PRINCIPLE OF OPERATION
The RGU-10A /RGU-100A is a type-A ultraimmunised earth leakage protection and monitoring relay
that is compatible with the earth leakage transformers in the WGC range.
The device measures, calculates and displays the residual current of balanced or unbalanced three-
phase industrial networks. The measurement is a true RMS value, taken by using a residual current
input from an external measurement toroidal transformer of the WGC series.
The RGU-10A /RGU-100A can be used to program and adjust all the parameters required to obtain
complete protection and control of the installation.
In normal operating conditions, the main values that determine the residual current protection of the
installation, such as sensitivity, delay and instantaneous leakage current, are shown on the display.
In normal operating conditions, the display is shown in White, Blue if in configuration mode, Yellow
if the pre-alarm has tripped, or Red for any event that causes a trip of the main relay, showing the
reason.
Main characteristics:
True root mean square value.
Ultra-immunised type A differential.
Immunity to transients.
Filtering of the highest order high frequencies.
Trip adjustment between 80 and 100% In.
Inverse curve.
4.2 - LED INDICATORS
The RGU-10A/RGU-100A device has 2 LEDs:
- CPU, indicates that the device is on.
- STATE, indicates the device status, see Table 6.
Table 6: State LED.
LED Backlight Description
Fast
blinking OFF Device processing the signal.
Slow
blinking Yellow Pre-alarm relay trip.
ON Network Deive triped due to leakage, transformer error, external
trip or TEST of the trip relay.

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CPU Estado / State
Figure 17: RGU-10A/RGU-100A LED indicators.
4.3 - DISPLAY
The device has a backlit LCD display that is split into two areas (Figure 18):
Unit and status areas
Data area
Figure 18: RGU-10A/RGU-100A display areas.
The data area, which displays all the values measured by the device, as well as the sensitivity
or delay settings.
The unit and device status area, which displays the different statuses, units and device in-
formation (Table 7).
Table 7: Display icons.
Icon Description Icon Description
Type-A residual current
protection Pre-alarm activated.
Programming screen. A trip has been generated.

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RGU-10A, RGU-100A
Table 7 (Continued): Display icons.
Icon Description
The relay works with positive polarity.
The direct adjustments "6 - DIRECT ADJUSTMENTS" are locked.
The setup menu "7  CONFIGURATION" is locked and cannot be accessed.
Go to the lock menu, "5.4 - LOCK" to change the option.
The device's display can change colour, indicating:
Alarma
Blue:
Adjustment or configuration screen.
Yellow:
The pre-alarm has been activated.
Red:
A relay has tripped due to leakage current, see "5.2.- TRIP DISPLAY SCREENS",
An Individual test has been carried out, see “5.3 - TEST SCREEN”.
An error has been detected, see "5.5 - ERROR SCREEN"
4.4 - KEYBOARD FUNCTIONS
The RGU-10A/RGU-100A has 3 keys to browse through the different screens and program the device.
Function of the keys (Table 8):
Table 8: Function of the keys on display screens.
Key Short keystroke Long keystroke (3s)
TPrevious screen Tests the trip relay.
RNext screen If there has been a trip, it resets the relay.
Access to the Lock/Unlock menu
and device setup. -

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4.5 - RELAY
The RGU-10A/RGU-100A has 2 output relays, an R1 trip relay and an R2 pre-alarm relay (Figure 19).
See "6 - DIRECT ADJUSTMENTS"to configure the parameters of the trip relay and "7.1 - PRE-ALARM RE-
LAY"to configure the parameters of the pre-alarm relay.
Entrada digital
Digital input
RGU-10A
19 20
94k
TRIP/RESET
230 V~
6
2 3 451
R2
R1
Figure 19:RGU-10A/RGU-100A relay.
4.6 - DIGITAL INPUT
The device has a digital input, TRIP/RESET (Figure 20), to do an external trip or reset.
If this input is activated, the relay is tripped. See “5.2 - TRIP DISPLAY SCREENS”.
Entrada digital
Digital input
RGU-10A
19 20
94k
TRIP/RESET
230 V~
6
2 3 451
R2
R1
Figure 20: RGU-10A/RGU-100A Digital inputs.
The TRIP/RESET digital input works like a status input, meaning if the device is in idle and a voltage
is applied to the digital input, the R1 trip relay trips. The device remains tripped while the digital input
remains activated, Figure 21.