Circutor RGU-10 MT User manual

INSTRUCTION MANUAL
Electronic earth leakage protection relay
RGU-10 MT Serie
(M98228501-03-21A)

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RGU-10 MT
Instruction Manual

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Instruction Manual
RGU-10 MT
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 unit may result in injury to personnel as well as damage to the
unit. 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 unit. Follow all installation and maintenance in-
structions throughout the unit’s working life. Pay special attention to the installation standards of the
National Electrical Code.
Refer to the instruction manual before using the unit
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 unit and/or installations.
CIRCUTOR, SA reserves the right to modify features or the product manual without prior notification.
DISCLAIMER
CIRCUTOR, SA reserves the right to make modifications to the device or the unit specifications set
out in this instruction manual without prior notice.
CIRCUTOR, SA on its web site, supplies its customers with the latest versions of the device specifica-
tions and the most updated manuals.
www.circutor.com
CIRCUTOR, recommends using the original cables and accessories that are supplied
with the device.

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RGU-10 MT
Instruction Manual
CONTENTS
SAFETY PRECAUTIONS .........................................................................................................................................................3
DISCLAIMER ..........................................................................................................................................................................3
CONTENTS.............................................................................................................................................................................4
REVISION LOG .......................................................................................................................................................................5
SYMBOLS...............................................................................................................................................................................5
1. VERIFICATIONS UPON RECEPTION..................................................................................................................................6
2. DESCRIPTION OF THE PRODUCT.....................................................................................................................................6
3. INSTALLING THE DEVICE.................................................................................................................................................8
3.1.- PRELIMINARY RECOMMENDATIONS ........................................................................................................................8
3.2.- INSTALLATION .........................................................................................................................................................9
3.2.1.- INSTALLATION OF DEVICE IN PANEL................................................................................................................9
3.3.- TERMINALS OF THE DEVICE..................................................................................................................................10
3.3.1.- COMMUNICATIONS CONNECTIONS ON THE RGU10C MT..............................................................................10
3.4.- CONNECTION DIAGRAMS.........................................................................................................................................11
3.4.1.- CONNECTION WITH CURRENT SHUNT COIL....................................................................................................11
3.4.2.- CONNECTION WITHOUT COIL WITH MTC62/64 CIRCUIT BREAKER.......................................................... 12
3.4.3.- CONNECTION WITH COIL WITH RECmax MP - C/D2/4................................................................................. 13
3.4.4.- CONNECTION WITHOUT COIL WITH RECmax MP -C/D2/4 .......................................................................... 14
3.4.5.- CONNECTION WITHOUT COIL WITH MTTSD CIRCUIT BREAKER.................................................................. 15
4. OPERATION ................................................................................................................................................................... 16
4.1.- GENERAL DESCRIPTION......................................................................................................................................... 16
4.2.- DESCRIPTION OF THE DEVICE ............................................................................................................................... 17
4.3.- LEDs INDICATORS.................................................................................................................................................. 17
4.4.- KEYBOARD FUNCTIONS.........................................................................................................................................18
4.5.- DISPLAY................................................................................................................................................................. 19
4.6.- OPERATION............................................................................................................................................................20
4.7.- TROUBLESHOOTING OR REASONS FOR TRIPPING.................................................................................................22
4.7.1.- POOR TOROID CONNECTION ALARM...............................................................................................................22
4.7.2.- TRIP ON DIFFERENTIAL FAILURE ...................................................................................................................22
4.7.3.- TRIP ON CIRCUIT BREAKER FAILURE .............................................................................................................23
4.7.4.- REMOTE TRIP ..................................................................................................................................................23
5. CONFIGURATION: DIRECT SETTINGS ............................................................................................................................24
5.1.- SETTING the SENSITIVITY TRIP .............................................................................................................................24
5.2.- DELAY SETTING AND MAIN RELAY CURVE...........................................................................................................24
5.3.- POSITIVE SAFETY SETTING OF THE INTERLOCK RELAY........................................................................................25
6. CONFIGURATION: ADJUSTMENTS USING SETUP MENU .............................................................................................26
6.1.- COMMUNICATIONS SETTINGS ................................................................................................................................27
6.1.1.- PERIPHERAL NUMBER.....................................................................................................................................27
6.1.2.- TRANSMISSION BAUDRATE ............................................................................................................................27
6.1.3.- PARITY.............................................................................................................................................................28
6.2.- MEASUREMENT CONFIGURATION..........................................................................................................................28
6.2.1.- WORKING FREQUENCY ...................................................................................................................................28
6.2.2.- LIMIT OF THE SCALES ....................................................................................................................................28
6.2.3.- CIRCUIT BREAKER ..........................................................................................................................................29
6.2.4.- RESETTING THE PARTIAL METER ..................................................................................................................29
6.2.5.- STATUS OF THE CONTACTORS ON THE COIL................................................................................................. 30
7. CONFIGURATION: ADJUSTMENTS BY DIFFERENTIAL AND MAGNETOTHERMIC .......................................................... 31
8. RS485 COMMUNICATIONS ..........................................................................................................................................32
8.1.- MODBUS CONNECTION..........................................................................................................................................32
8.2.- MODBUS PROTOCOL..............................................................................................................................................32
8.2.1.- READING EXAMPLE.........................................................................................................................................32
8.2.2.- WRITE EXAMPLE ............................................................................................................................................33
8.3.- MODBUS MEMORY MAP.......................................................................................................................................34
9. TECHNICAL FEATURES..................................................................................................................................................35
10. TECHNICAL SERVICE ...................................................................................................................................................37
11. WARRANTY...................................................................................................................................................................37
12. CE CERTIFICATE.......................................................................................................................................................... 38

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Instruction Manual
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REVISION LOG
Table 1: Revision log.
Date Revision Description
09/21 M98228501-03-21A
New version.
Changes in the following sections:
3.4.
Note: The images of the devices are for illustrative purposes only and might differ from the original
device.
SYMBOLS
Table 2: Symbols.
Symbol Description
In compliance with the relevant European directive.
In accordance with the CMiM directive.
In accordance with the UKCA directive (UK Conformity Assessed)
The device complies with the 2012/19/EC European directive. Do not dispose of the device in a
household waste container at the end of its useful life. Observe the local electronic device recy-
cling regulations.
Direct current.
~Alternating current.

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RGU-10 MT
Instruction Manual
1. VERIFICATIONS UPON RECEPTION
The following must be checked upon reception of the device:
a) The device has been supplied according to the specifications in your order.
b) The device has not been damaged during transport.
c) Perform an external visual inspection of the device before connecting it.
d) Check that it has been supplied with the following:
- An installation guide.
Immediately contact the carrier and/or CIRCUTOR’s after-sales service if you de-
tect any problem in the device upon reception.
2. DESCRIPTION OF THE PRODUCT
The RGU-10 MT is a type A earth leakage protection device. It has 2 output relays: The main one, to
control the circuit breaker and provide earth leakage/overcurrent protection and the interlock function,
to indicate that the maximum number of reclosings has been reached.
Allows the setting and adjustment of all parameters required for complete protection and maintenance
checking in the installation.
The RGU-10 MT measures, calculates and displays the earth leakage current in three-phase, balanced
or unbalanced industrial systems.
Measurements are in true effective value, via one earth leakage current input, from the WG/WGS fam-
ilies external measuring toroid.
Under normal operating conditions the main values determining earth leakage protection in an instal-
lation are shown on the display. These include sensitivity, delay and instant current leakage.
Under normal operating conditions the backlit display is green. However, after any event causing a
main relay to trip, the backlight is red, indicating the reason.

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RGU-10 MT
Main features:
- Measuring in true effective value-
- Type A differential (IEC 61008-1)
- Insulation against transients (IEC 61008.1)
- High frequency filtering (IEC 61008.1)
- Trip setting between 80 and 100% I∆n
- Inverse curve (IEC 61008.1)
- Associated standard: IEC 61008.1, IEC755
- 3 modules. DIN rail. In a panel using front accessory
- Displaying instant leakage values.
- Backlit LCD display.
- RGU-10C MT: RS - 485 communication (Modbus RTU®).
The measurement of the earth leakage current that actuates the RGU-10 MT/RGU-10C MT, indicating
the instantaneous leakage current, is determined by the earth leakage transformers of the WG series.
The inner diameter of the transformer is defined by the wiring dimensions of the installation.

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3. INSTALLING THE DEVICE
3.1.- PRELIMINARY RECOMMENDATIONS
The operators using and handling the device must follow the safety measures estab-
lished in the country where the device will be used to guarantee its safe operation,
using personal protective equipment if needed.
The RGU-10 MT device must be installed by authorised and qualified staff.
Disconnect the device from the mains and disconnect the measuring devices before handling, chang-
ing the connections of or replacing the device. Handling the device while it is connected is hazardous
to people nearby.
The cables must be in perfect working order to prevent accidents or injuries to people and/or damage
to the facilities/installations.
Limit the operation of the device to measuring the specified current or voltage values.
The manufacturer of the device shall not be held responsible for any damage resulting from the user
or installation company failing to observe the warnings and/or recommendations indicated in this
manual nor for any damage resulting from the use of non-original products or accessories or those
from other brands.
Do not use the device to take measurements if you detect an anomaly or malfunction.
Check the environment in which the device is installed before taking a measurement. Do not use the
device to take measurements in dangerous, explosive, wet or damp environments.
Disconnect the device from the mains and from the power supply (both the device and
its measuring system) before performing any maintenance work, repairs or handling
any of the connections of the device.
Contact the after-sales service if you detect that the device is not working properly.

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RGU-10 MT
3.2.- INSTALLATION
While the device is connected, the terminals, opening the cover or removing ele-
ments can expose parts that are hazardous to the touch. The device must not be
used until the installation process is complete.
The device is installed on a DIN rail or on a panel (drilled panel 67+1 x 67+1mm, according to DIN 43 700
using accessory). All connections must remain inside the electrical board.
The device has to be connected to a power circuit protected with gL fuses (IEC 60269) or type M fuses
between 0.5 and 2 A. The power circuit, in turn, must be fitted with a circuit breaker or equivalent
device to disconnect the device from the mains supply.
Twisted cable should be used if connecting the earth leakage transformer over long distances.
3.2.1.- INSTALLATION OF DEVICE IN PANEL
A 72x72 mm front adapter accessory is used to install the device on a panel. All connections must re-
main inside the electrical board.
The front adapter accessory has a base, a frame two tabs and three screws, Figure 1.
Figure 1:Adapter accessory.
The steps to follow to perform the installation of the adapter accessory are:
1.- The base is mounted on top of the device.
2.- The device is attached by screwing the holes in the device on the upper right corner and lower left
corner on the front of device.
3.- The front frame is attached to cover the mounting points.
4.- Three green pressure tabs on the side runners of the base are attached.
5.- The device is mounted in the hole in the panel with the adapter.
6.- The tabs run towards the panel to obtain the mounting pressure.

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Figure 2: Installation of adapter accessory.
3.3.- TERMINALS OF THE DEVICE
Table 3:Terminal description RGU-10 MT.
Terminal description
1: Trigger input - External reset 9: Interlock relay (NC)
2: Trigger input - External reset 10: A1, Power supply
3: Transformer current input 1S2 11: A2, Power supply/State of the circuit breaker
4: Transformer current input 1S1 12: State of the circuit breaker
5: Trip Contact, Coil (Common) 13: Motor output contact (OFF)
6: Trip Contact, Coil (NO) 14: Motor output contact (Common)
7: Interlock relay (NO) 15: Motor output contact (ON)
8: Interlock relay (Common)
7 8
1 2 4 5 6
10 11 13 14 15
Reset
Test
RGU-10 MT
12
3 9
Figure 3: RGU-10 MT Terminals.
3.3.1.- COMMUNICATIONS CONNECTIONS ON THE RGU10C MT
ASB
1
2
3
4
5
6
7
8
9
RS-485
Figure 4: RS-485 Communications (RGU-10C MT Model).

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RGU-10 MT
3.4.- CONNECTION DIAGRAMS
3.4.1.- CONNECTION WITH CURRENT SHUNT COIL
SUPPLY: 230 V ~
CARGA
LOAD
NL1 L2 L3
M
U>
N L
C1
C2 OI12
11
1S1
1S2
TypeWG
External ON/OFF
Disparo por BOBINA
Trip by COIL.
7 8
1 2 4 5 6
10 11 13 14 15
Reset
Test
RGU-10 MT
12
3 9
MT- C-62/64
TRIP:
SEC.T: St Bobina de emisión
Pt Bobina de mínima
AJUSTE POR SETUP
ON / OFF externo
St (in case of shunt coil)
Pt (in case of undervoltage coil)
Figure 5: RGU-10 MT: Triggering by shunt Coil.

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RGU-10 MT
Instruction Manual
3.4.2.- CONNECTION WITHOUT COIL WITH MTC62/64 CIRCUIT BREAKER
The device is connected to the power supply before the circuit breaker, which is the MT-C-62/64 mo-
torized circuit breaker.
CARGA
LOAD
NL1 L2 L3
M
N L
OI12
11
TypeWG
External ON/OFF
Disparo por MOTOR OFF
Trip by OF F MOTOR.
7 81 2 4 5 6
10 11 13 14 15
Reset
Test
RGU-10 MT
12
3 9
1S1
1S2
MT-C-62/64
SUPPLY: 230 V ~
AJUSTE POR SETUP
TRIP:
ON / OFF externo
Figure 6: RGU-10 MT: Connection without coil with the MT-C-62/64 circuit breaker.

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RGU-10 MT
3.4.3.- CONNECTION WITH COIL WITH RECmax MP - C/D2/4
The device is connected to the power supply before the circuit breaker, which is the RECmax MP-C/
D2/4 motorized circuit breaker.
CARGA
LOAD
NL1 L2 L3
M
U>
N L
C1
C2 O I16
17
S1
S2
Type
External ON/OFF
7 8
1 2 4 5 6
10 11 13 14 15
Reset
Test
RGU-10 MT
12
3 9
TRIP:
SEC.T: St Bobina de emisión
Pt Bobina de mínima
AJUSTE POR
ON / OFF externo
St (in case of shunt coil)
Pt (in case of undervoltage coil)
RECmax MP - C/D2/4
Alimentación Auxiliar: 230 V~
Power Supply: 230 V~
C
18
WGC
SETUP RGU-10 MT
Figure 7: RGU-10 MT: Connection without coil with the RECmax MP-C/D2/4.

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Instruction Manual
3.4.4.- CONNECTION WITHOUT COIL WITH RECmax MP -C/D2/4
The device is connected to the power supply before the circuit breaker, which is the RECmax MP-C/
D2/4 motorized circuit breaker.
CARGA
LOAD
NL1 L2 L3
M
NL
OI16
17
Type
Ex ter nal ON/OFF
7 81 2 4 5 6
10 11 13 14 15
Reset
Test
RGU-10 MT
12
3 9
S1
S2
RECmax MP - C/D2/4
Alimentación Auxiliar: 230 V~
Power Supply: 230 V~
AJUSTE POR SETUP RGU-10 MT
TRIP:
ON / OFF externo
18
C
WGC
Figure 8: RGU-10 MT: Connection without coil with the RECmax MP-C/D2/4.

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RGU-10 MT
3.4.5.- CONNECTION WITHOUT COIL WITH MTTSD CIRCUIT BREAKER
The device is connected to the power supply before the circuit breaker, which is the MT-TSD motorized
circuit breaker.
Figure 9: RGU-10 MT: Connection without coil with the MT-TSD circuit breaker.
MT-TSD

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Instruction Manual
4. OPERATION
4.1.- GENERAL DESCRIPTION
RGU-10 MT
Instant current
leakage Display
Backlit LCD
display
Small size
3 módule
DIN rail
Panel (Adapter accessory)
Output Relays
Programming of
parameters
ASSOCIATED
BREAKING DEVICE
Earth leakage device
with trip coil
ASSOCIATED
MEASURING DEVICE
WG and WGS toroidal
family
Figure 10: General description.

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RGU-10 MT
4.2.- DESCRIPTION OF THE DEVICE
The front of the equipment which is formed by the display, buttons and LEDs, is protected with a seal-
able plastic cover which has the appropriate holes to access the RESET, TEST and PROG/PAG keys.
ON LED
Interlock/reclosing LED
RESET key
SENSITIVITY key
TEST key
PROG / PAG key
RESET PREALARM key
SAFETY key
DELAY key
Figure 11: Description LEDs and button.
4.3.- LEDs INDICATORS
The device has 2 indicators LEDs, Figure 11.
Table 4: LEDs description: ON LED.
ON LED
State Description
Off The device is not operating or is not receiving power supply voltage.
Green The device is operating.
Red The device has tripped.
Table 5: LEDs description:INTERLOCK/RECLOSING LED.
INTERLOCK/RECLOSING LED
State Description
Off No interlocking or reconnection
On Interlock produced by exceeding the number of reconnections.
On
flashing Device timing for reconnection.

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4.4.- KEYBOARD FUNCTIONS
The device has 7 keys, Figure 11.
1.- Keys accessible with sealed cover and tool
RESET, Starts the device after a trip.
TEST, Carries out a trip to check the proper operation of the relay.
PROG/PAG, dual-function key:
A short press displays earth leakage or overcurrent reclosings.
A long press opens the device programming menu.
2.- Keys accessible with cover open
Keys with dual function. With a long press, the device is entered to set the values. With a short press,
the option within a series of values defined in the device is selected.
SENSITIVITY (In), It allows to choose between the values of 30, 100, 300, 500 mA , 1 and 3 A
Specifying the expanded scale in the settings adds 5, 10 and 30 A to the list of values above.
DELAY (td), It allows to choose between the values of 20, 100, 200, 300, 400, 500, 750 ms
and 1 s.
Specifying the expanded scale in the settings adds 5, 10 and 30 A to the list of values above.
This key can also be used to navigate inside the programming menu.
3.- Keys accessible with cover open and tool
Flush buttons.
SAFETY (Std/+), used to configure the polarity of the contacts on the interlock relay (Termi-
nals 7, 8 and 9).
●With normal safety (Std) the relay is activated with a fault, the status is NO.
●With positive safety (+) the relay is activated on supplying the device and is deactivated with
the fault, the status is NC.
REC, used to enable or disable the overcurrent and earth leakage reclosing.
When in the reclosings screen, it is used to change the number of maximum overcurrent and
earth leakage reclosings.

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4.5.- DISPLAY
The device has a backlit display with green or red light, depending on the state of the device.
The background to the screen in normal mode is green. The parameters required for earth leakage
protection, sensitivity and delay in its associated units are displayed. It also displays the current leak-
age current.
If the device trips through any event, the screen’s background changes to red and the reason for the
trip is displayed.
Figure 12: Display RGU-10 MT.
Display messages by device trip, Table 6.
Table 6: Display messages by device trip.
Message Cause of trip
TESt Test
EXT Remote signalON/OFF
REM RS-485 communications
DIF/Valor Differential
MAG Circuit breaker
Other display messages, Table 7.
Table 7: Other display messages.
Message Description
SAVE Validate configuration values
EXIT Exits programming mode
ERRt Poor toroid connection
OVR Current leakage reading off scale

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4.6.- OPERATION
When the device is powered at its rated voltage, the green LED ON the front is on, the backlit LCD is
green indicating the software and hardware version. After a short while, the version disappears and
the default display values appear on the display.
Figure 13:Initial screens.
The display shows the delay and sensitivity settings as well as the instant leakage current reading.
While the device is operating, the display shows the following symbols while the device is being pro-
grammed and set, Figure 14.
Trip sensitivity
Instant current
leakage
Active reconnection
Contact
polarity
Trip delay
Conguration
setting
Communications
conguration
Figure 14: Description display.
In normal operating status the display shows the following parameters associated with the earth leak-
age protection, Table 8.
Table 8: Parameters visible by display.
Parameter Units
Instant current leakage mA/A
Programmed trip delay, td ms/s
Programmed sensitivity of trip, Id = I∆NmA/A
The RGU-10 MT/RGU-10C MT lets you display and program all the parameters required to finish
setting up the earth leakage/overcurrent protection and communications, Table 9.