CIRCUTOR RGU2 User Manual

Earth leakage relay

RGU-2

INSTRUCTION MANUAL

(M98251301-03-13B)

RGU-2 Earth Leakage Relay

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Instruction Manual

RGU-2 Earth Leakage Relay

SAFETY PRECAUTIONS

Follow the warnings described in this manual with the symbols shown below.

DANGER

Warns of a risk, which could result in personal injury or material damage.

ATTENTION

Indicates that special attention should be paid to a speci c point.

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  re.

Read the manual carefully prior to connecting the unit. Follow all installation and maintenance instructions 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 noti cation.

DISCLAIMER

CIRCUTOR, SA reserves the right to make modi cations to the device or the unit speci ca-

tions 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

speci cations and the most updated manuals.

www.circutor.com

Instruction Manual

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RGU-2 Earth Leakage Relay

REVISION LOG

Table 1: Revision log�

Date Revision Description

10/13 M98251301-03-13A Initial Version

11/13 M98251301-03-13B Modied Figure 1

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RGU-2 Earth Leakage Relay

1�- VERIFICATION UPON RECEPTION

Check the following points when you receive the unit:

a) The unit meets the specications described in your order.

b) The unit has not suffered any damage during transport. c) Perform an external visual inspection of the unit prior to switching it on. d) Check that it has been delivered with the following:

- a seal to lock the programming button.

- installation guide.

If any problem is noticed upon reception, immediately contact the transport company and/or CIRCUTOR's after-sales service.

2�- PRODUCT DESCRIPTION

RGU-2 is a protection and/or measurement relay (MRCD/RCM). It is a smart earth leakage

protection system composed of the following elements:

- A detecting element or sensor,

- A relay,

- A circuit breaker,

The unit is fully programmable. It is supplied with the following:

- 3 Keys, used to TEST/RESET and program the unit.

- 2 operation LEDs that display the unit's status.

- LCD Display that displays messages and operation values.

- An LED Bar that displays qualitative level of leakage information.

- Plug-in terminal strips.

The unit is characterised by its reduced dimensions (2 modules mounted on a DIN rail).

It has been designed for single-phase, three-phase or three-phase with neutral low voltage electrical installations. It is suitable for all neutral rates (VT, TN, IT), either as the main protection element (MRCD) or for complementary purposes (RCM). In the case of VT/TN-S systems, it can be used as a MRCD (IEC 60947-2) or a RCM (IEC

62020). It can only be installed as an RCM in other systems.

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Instruction Manual

RGU-2 Earth Leakage Relay

3�- UNIT INSTALLATION

3.1.- PRIOR RECOMMENDATIONS

In order to use the unit safely, it is critical that individuals who handle it follow the safety measures set out in the standards of the country where it is being used, use the personal protection unit necessary, and pay attention to the various warnings indicated in this instruction manual.

The RGU-2 unit must be installed by authorised and qualied staff.

The power supply plug must be disconnected and measuring systems switched off before handling, altering the connections or replacing the unit. It is dangerous to handle the unit while it is powered.

Also, it is critical to keep the cables in perfect condition in order to avoid accidents, personal injury and damage to installations.

The manufacturer of the unit is not responsible for any damages resulting from failure by the user or installer to heed the warnings and/or recommendations set out in this manual, nor for damages resulting from the use of non-original products or accessories or those made by other manufacturers.

In the event an anomaly or malfunction is detected in the unit, refrain from using it to make any measurements.

Inspect the work area before making any measurements. Do not take measurements in dangerous areas or where there is a risk of explosion.

Disconnect the unit from the power supply (unit and measuring system power supply) before maintaining, repairing or handling the unit's connections. Please contact the after-sales service if you suspect that there is an operational fault in the unit.

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RGU-2 Earth Leakage Relay

3.2.- INSTALLATION

The unit is installed on a DIN rail.

All active conductors that supply the loads or the part of the installation where the earth leakage protection with this unit is required must pass through the sensor associated with the unit.

The unit must be mounted inside an electric panel.

Likewise, it must be connected to a fuse-protected power circuit, in accordance with its power

supply range and consumption. In turn, the power circuit must be tted with a circuit breaker

switch or an equivalent device, in order to be able to disconnect the unit from the power supply mains.

Note: The connection diagram suggests a cable section of 1- 1.5 mm. Recommended torque 0.5-0.6 Nm.

Terminals, opening covers or removing elements can expose parts that are hazardous to the touch while the unit is powered

3.3.- UNIT TERMINALS

Table 2: Unit terminals�

Unit terminals

1, 2 : External current sensor input. 8: External Test/Reset input with button.

3, 6, 10, 12: Not used 9, 11: Auxiliary Power Supply

4: Prealarm/Fault relay output: NO Contact 13: Trip relay output: NO Contact

5: Prealarm/Fault relay output: COM Contact 14: Trip relay output: NC Contact

7: External Test/Reset input with button. 15: Trip relay output: COM Contact

Figure 1:Unit terminals�

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RGU-2 Earth Leakage Relay

3.4.- CONNECTION DIAGRAM

3�4�1� AS A PROTECTION ELEMENT (MRCD)

A�- SHUNT COIL TRIP (Manual reclosing system with RESET)

Figure 2: Connection diagram of the unit as a protection element: shunt coil trip�

B�- UNDERVOLTAGE COIL TRIP (Manual reclosing system with RESET)

Figure 3:Connection diagram of the unit as a protection element: undervoltage coil trip�

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3�4�2� AS A MONITOR (RCM)

RGU-2 Earth Leakage Relay

Figure 4:Connection diagram of the unit as a monitor�

4�- START-UP

4.1.- DEFAULT CONFIGURATION

When the unit is powered with auxiliary voltage, the ON LED is lit green and the LCD is backlit green.

The name of the model, rmware version and a xed screen that shows the conditions in which

the earth leakage protection is characterised will be displayed.

This screen is displayed by default when there are no external actions (Figure 5).

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Figure 5: Earth leakage protection screen

The unit is supplied with the following default factory conguration:

- Trip current scale (IΔn) : 30mA

- Trip time scale (td) :Instantaneous curve (IN)

- Frequency: 50 Hz

- Auxiliary relay function: Fault relay

- Polarity of the trip relay: Standard

- Polarity of the auxiliary relay: Standard

Instruction Manual

RGU-2 Earth Leakage Relay

In case a level of leakage has been detected, the LCD will show the earth leakage symbol, (Figure 6)�

Figure 6: Earth leakage protection with leakage screen�

Finally, the following screen will be displayed when the AUX relay has been congured as a

prealarm, (Figure 7).

Figure 7:Earth leakage protection with prealarm screen�

4.2.- BASIC SETUP

Once the unit has been connected, it must be programmed in accordance with the installation's features. The following basic parameters can be programmed:

- Adjust the trip current.

- Adjust the trip delay time.

- Select the frequency of the installation to be supervised.

5�- OPERATION

The RGU-2 unit helps control the electrical insulation level of an installation by controlling the intensity of the leakage current.

Intelligent block Actuator blockSensor block

Inputs

RGU-2

Outputs

An external sensor detects and measures the earth leakage current. Circutor offers the following unit protection models in its current range of sensors: WG/WGS/WGC/TP-WG.

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RGU-2 Earth Leakage Relay

When the instantaneous leakage current has been measured, the RGU-2 unit will operate in accordance with the programmed parameters:

- Trip current (IΔn)

- Trip delay time (td)

As a result, the status of the device's output contacts will be changed. The output of this contact

will be used as follows, depending on the nal application type:

- Earth leakage protection (IEC61008-1), the circuit breakers are activated.

- Earth leakage monitoring (IEC62020), alarm alerts, sound and/or visual devices.

5.1.- KEYBOARD FUNCTIONS

The unit has 3 keys: RESET, TEST and PROG.

PROG Key Pressing this key displays the different screens and opens the programming mode (hold down the key for 2 seconds) to adjust the different programming parameters.

This key is sealable; it is supplied with a small hole where the conguration can be physically

disabled.

TEST Key Press the TEST key to check the connection status of the sensor element and force the tripping of the unit.

RESET key

Locally rearms the electronic relay, resetting the status of the output contacts to the normal standby status. If the unit is in standby status, it will scroll down the model and version (5s) on the green LCD.

5.2.- DISPLAY

The unit has a green/red backlit LCD. The background will be green under normal conditions. The display will be red in case of events that cause an action (protection trigger or circuit breaker being tripped).

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Figure 8:Display

Instruction Manual

RGU-2 Earth Leakage Relay

The following are shown on the display by default:

- IΔn, Adjusted trip current and associated units.

- td, Delay time of the adjusted trip and associated units.

- Prealarm symbol (when active).

The unit has different screens that can be set as the unit's display: Earth leakage protection screen (Figure 9)

Figure 9:Earth leakage protection screen

Instantaneous current screen (Figure 10)

Figure 10:Instantaneous current screen

The trip current will be displayed when the protection element has been tripped (Figure 11):

Figure 11: Trip current screen (Example: 45mA trip current)

Floating screens can also be displayed; they will be shown during 5 seconds and then return to

the xed active screen, such as:

AUX relay prealarm screen (Figure 12).

Instruction Manual

Figure 12:Prealarm screen�

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AUX relay fault screen (Figure 13)�

Figure 13:Fault relay screen�

5.3.- LED INDICATORS

The unit has the following LEDs:

LED ON

Green LED, indicates that the unit is voltage-fed.

The LED ashes when problems have been detected in the sensor.

RGU-2 Earth Leakage Relay

LEAKAGE LED

Red LED indicates that the protection element has been tripped as a result of a residual current intensity value that is higher than the current threshold required to trip the protection element.

LED Bar

LED Bar indicates the leakage current level of the installation. The current levels are displayed as a %, in accordance with the selected trip scale: 20% - 40% - 60% green, 80% yellow, 100% red.

5.4.- INPUTS

The unit has two inputs:

External current sensor input (terminals 1 and 2 in Figure 1). With this input the unit checks every 5 seconds whether the connection with the external sensor is correct by means of an inductive test.

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External test input with button (terminals 7 and 8 in Figure 1).

Input activated by level. When voltage is applied, this forces the tripping of the unit; when it is no longer applied the unit returns to the previous state. The keyboard reset function will be disabled when this input is active.

Instruction Manual

RGU-2 Earth Leakage Relay

5.5.- OUTPUTS

The unit has two independent output relays:

5�5�1� TRIP RELAY, TRIP

Switched contact relay (terminals 13, 14 and 15 in Figure 1) The unit can be programmed to modify the logical status of the contact (refer to section 5.6.3) from the standard NC/NO status to the NO/NC positive safety status.

The positive safety status is shown on all screens that refer to the TRIP, with the + sign (Figure

14). The prealarm/fault screen will not be affected by this.

Figure 14: Positive safety status screen

5�5�2� AUXILIARY RELAY, AUX

Simple contact relay (terminals 4 and 5, and Figure 1) non-interlocking. Its operation can be programmed as a prealarm or fault relay (refer to section 5.6.2 )

Prealarm (ALAR), activated when the IΔ > 0.5•IΔn, in 200 milliseconds. The logical sta- tus of the contact (refer to section 5.6.3) can be changed from the NO standard status to the NC positive safety status.

The Fault relay (AUXF), is activated to notify fault events in the unit, such as:

undervoltages (the voltage is below the unit's operation voltage - the unit turns off below this voltage) or faults in the external sensor.

In this case, the relay operates with the positive safety status. Positive safety is shown with the + sign (only in the screens that refer to the AUX relay).

Instruction Manual

Figure 15:Screens with a positive safety status�

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RGU-2 Earth Leakage Relay

5.6.- PROGRAMMING

5�6�1 TRIP CURRENT IΔn and TRIP DELAY TIME td

The earth leakage protection screen must be displayed to program the current and delay time of the trip. Hold down the PROG key for 2 seconds.

PROG

Trip delay time, td

The current value will start ashing. Press the RESET key gradually to browse all programming values (Tabla 3). Accept with the PROG key.

PROG

Trip current, td

The current value will start ashing. Press the RESET key gradually to browse all programming values (Tabla 3). Accept with the PROG key.

PROG

If changes have been applied, SAVE will be displayed for 3 sec- onds and the unit will exit the programming screens.

If changes have not been applied, EXIT will be displayed for 3 sec- onds and the unit will exit the programming screens.

Note: If you reach the last value of the Trip current to be congured and you do not press the

PROG key to accept the changes, the unit will exit the programming screen after 5 seconds and the changes will not be saved.

Table 3:Relationship of Currents and Trip Times to be programmed�

Trip current IΔn Trip time td

30mA IN ( Instantaneous )

0.1A SE (Selective)

0.3A 0.1s

0.5A 0.2s

1A 0.3s

2A 0.5s

3A 0.8s

5A 1s

2s

3s

5s

(1)

The trip curves are shown in Appendix A

(1)

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RGU-2 Earth Leakage Relay

5�6�2 PROGRAMMING THE AUXILIARY RELAY, AUX

Open the auxiliary output screen and hold down the RESET key for 2 seconds to program the operation of the auxiliary relay.

Prealarm (ALAR)

This is activated when IΔ > 0.5•IΔn, in 200 milliseconds.

RESET

Fault relay (AUXF)

Shows fault events in the unit, such as undervoltages or faults in the external sensor. Operates in the positive safety status.

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RGU-2 Earth Leakage Relay

5�6�3 FREQUENCY AND STATUS OF THE OUTPUT RELAY CONTACTS

To program the frequency and status of the output relay contacts, TRIP and AUX, open the instantaneous current screen and hold down the PROG key for 2 seconds.

PROG

Frequency (50Hz by default)

PROG

Select the frequency: 50Hz or 60Hz.

Accept with the PROG key.

RESET

RESETRESET

RESET

PROG

RESETRESET

RESET

Status of the TRIP relay contact (STD, by default)

STD: Standard NC/NO status POS: NO/NC positive safety status

When this option is activated, the + sign will appear on all screens that refer to the TRIP relay.

Accept with the PROG key.

Status of the AUX relay contact (STD, by default)

STD: Standard NO status. POS: NC positive safety status.

When this option is activated, the + sign will appear on all screens that refer to the

AUX relay.

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Accept with the PROG key.

If changes have been applied, SAVE will be displayed for 3 seconds and the unit will exit the programming screens.

If changes have not been applied or the keyboard has been inactive during 5 seconds, EXIT will be displayed for 3 seconds and the unit will exit the programming screens.

Instruction Manual

RGU-2 Earth Leakage Relay

5�6�4 LOCKING THE KEYBOARD

The unit has a series of devices that can be used to disable the programming operations (sealable PROG button). However, the PROG key can be locked with the unit's software by holding down the RESET and PROG keys for 2 seconds.

PROG

BLON (N appears ashing)

Unlocked keyboard.

RESET

BLOY (Y appears ashing)

Locked keyboard.

Accept with the PROG key.

If changes have been applied, SAVE will be displayed for 3 seconds and the unit will exit the programming screens.

If changes have not been applied or the keyboard has been inactive during 5 seconds, EXIT will be displayed for 3 seconds and the unit will exit the programming screens.

When the PROG key is locked, a oating message will appear on the display to show that it is protected if it is pressed.

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RGU-2 Earth Leakage Relay

5.7.- TRIP EVENTS

When a circuit breaker has been activated, the LEDs, output contacts and display will indicate the cause that generated this situation.

5�7�1� EARTH LEAKAGE CURRENT INTENSITY TRIP

LED ON LED, off. LEAKAGE LED, xed.

OUTPUT RELAYS The TRIP relay (terminals 13,14,15) changes its status, IΔ >0,85•IΔn, in accord ance with the programmed times The AUX relay (terminals 4,5) only changes its status if it has been congured as a pre-alarm

DISPLAY Fixed red screen that shows the leakage with the earth leakage symbol (Figure 16).

Figure 16:Leakage screen

Prealarm symbol when this function has been activated (Figure 17).

Figure 17:Leakage with prealarm screen

Note : Press the PROG key to modify the current and trip time. ( refer to sec- tion 5.6.1)

If the value is off the scale (> 5•IΔn), OVR and the pre-alarm symbol will be dis played (Figure 18).

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Figure 18: Off the scale screen

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RGU-2 Earth Leakage Relay

5�7�2� LOCAL / EXTERNAL TEST TRIP

LED ON LED, off. LEAKAGE LED, xed.

OUTPUT RELAYS The TRIP relay (terminals 13,14,15) changes its status. The AUX relay (terminals 4,5), only changes its status if it has been congured as a prealarm

DISPLAY Red screen that shows that the cause has been as a result of the TEST

(Figure 20),

Figure 19: Test screen

5�7�3� UNDERVOLTAGE / POSITIVE SAFETY PROTECTION TRIP

OUTPUT RELAYS

The AUX relay (terminals 4,5), only changes its status if it has been congured in the fault mode with positive safety. When the power supply voltage is below the minimum operating voltage of the unit, the relay output will change its status to standby.

5�7�4� INPUT SENSOR ERROR TRIP

LED ON LED, ashing LEAKAGE LED, xed.

OUTPUT RELAYS The TRIP relay (terminals 13,14,15) changes its status. The AUX relay (terminals 4,5), only changes its status if it has been congured in the fault mode.

DISPLAY Red screen that shows that the cause has been an inductor error in the input sensor (Figure 21).

Instruction Manual

Figure 20: Input sensor error screen

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RGU-2 Earth Leakage Relay

5.8.- RECLOSING SYSTEM

The reclosing system varies after a leakage or test trip, in accordance with the unit's connection diagram.

5�8�1� “MANUAL” RECLOSING SYSTEM WITH THE RESET KEY

The unit's power supply must be connected before the circuit breaker.

1� In the event of tripping, the unit is set to tripping conditions and the circuit breaker (MCB/MCCB with coil) is set to OFF.

2� The unit returns to the normal operating conditions after the RESET key has been pressed.

3� Finally, the ON circuit breaker is activated manually.

NOTE: In case a contactor is used as a circuit breaker, reclosing the RGU-2 recloses the sys-

tem with no need to perform any other operations.

5�8�2� RECLOSING SYSTEM WITH THE EXTERNAL TEST/RESET INPUT

The unit also can reconnect with the external Test/Reset input (terminals 7 and 8 in Figure 1)�

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RGU-2 Earth Leakage Relay

6�- TECHNICAL FEATURES

Power Supply

Voltage 110V AC o 230V AC

Tolerance -20%, +20%

Frequency 50 Hz - 60 Hz

Maximun consumption 6 VA ( 110V AC) - 6 VA ( 230V AC)

Voltage pulse 4KV

Installation category CAT III 300V

Current measurement circuit

Sensor input Transformer type TP-WG, WG o WGC to 500/1

Measurement system short circuit

Frequency 50Hz -60Hz

Accuracy in measurement

Accuracy current measurement < 10%

Characteristics of trip relay TRIP

Maximum voltage open contacts 1000V AC

Isolation voltage 2500V AC

Thermal current, Ith 10A

Maximum switching power 2500 VA

Electrical life ( 3A) 30*10

3

Characteristics of auxiliar relay AUX

Maximum voltage open contacts 1000V AC

Isolation voltage 2000V AC

Thermal current, Ith 5A

Maximum switching power 1250 VA, 150W

Electrical life ( 3A) 10

5

Environmental characteristics

Work temperature -10ºC ... +50ºC

Storage temperature -25ºC ... 70ºC

Humidity (without condensation) 5 ... 95%

Maximum altitude 2000 m

Pollution resistance Category 2

Protection degree IP40

Mechanical caracteristics

Dimensions 35x112x84 mm

Weight 150gr

Housing Polycarbonate V0

Standards

Low-voltage switchgear and controlgear � Part 2:

IEC 60947-2 Anexo M: 2011

Circuit-breakers

Electrical accessories - Residual current monitors for

IEC 62020: 1998

household and similar uses (RCMs)

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6.1.- DIMENSIONS

RGU-2 Earth Leakage Relay

Figure 21:Dimensions of the RGU-2

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Instruction Manual

RGU-2 Earth Leakage Relay

7�- MAINTENANCE AND TECHNICAL SERVICE

In the case of any query in relation to unit operation or malfunction, please contact the

CIRCUTOR, SA Technical Support Service.

Technical Assistance Service

Vial Sant Jordi, s/n, 08232 - Viladecavalls (Barcelona) Tel: 902 449 459 ( España) / +34 937 452 919 (outside of Spain) email: sat@circutor.es

CIRCUTOR, SA

Vial Sant Jordi, s/n, 08232 - Viladecavalls (Barcelona) Tel: 93 745 29 00/ Fax: 93 745 29 14 email: central@circutor.es / www.circutor.es

8�- WARRANTY

CIRCUTOR guarantees its products against any manufacturing defect for two years after the

delivery of the units.

CIRCUTOR will repair or replace any defective factory product returned during the guarantee period.

• No returns will be accepted and no unit will be repaired or replaced if it is not accompanied by a report indicating the defect detected or the reason for the return.

•The guarantee will be void if the units has been improperly used or the stora-

ge, installation and maintenance instructions listed in this manual have not been

followed. “Improper usage” is de ned as any operating or storage condition con-

trary to the national electrical code or that surpasses the limits indicated in the technical and environmental features of this manual.

• CIRCUTOR accepts no liability due to the possible damage to the unit or other parts of the installation, nor will it cover any possible sanctions derived from a possible failure, improper installation or “improper usage” of the unit. Consequently, this guarantee does not apply to failures occurring in the following cases:

- Overvoltages and/or electrical disturbances in the supply;

- Water, if the product does not have the appropriate IP classi cation;

- Poor ventilation and/or excessive temperatures;

- Improper installation and/or lack of maintenance;

- Buyer repairs or modi cations without the manufacturer’s authorisation.

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9�- CE CERTIFICATE

RGU-2 Earth Leakage Relay

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Instruction Manual

RGU-2 Earth Leakage Relay

APPENDIX A: TRIP CURVES

INSTANTANEOUS CURVE

( INS)

Figure 22: Instantaneous Trip Curve�

SELECTIVE CURVE

( SEL)

Instruction Manual

Figure 23: Selective Trip Curve�

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CIRCUTOR, SA Vial Sant Jordi, s/n 08232 -Viladecavalls (Barcelona) Tel.: (+34) 93 745 29 00 - Fax: (+34) 93 745 29 14 www.circutor.es central@circutor.es

CIRCUTOR RGU2 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

SAFETY PRECAUTIONS

DISCLAIMER

CONTENTS

REVISION LOG

1�- VERIFICATION UPON RECEPTION

5�7�2� LOCAL / EXTERNAL TEST TRIP

5�7�3� UNDERVOLTAGE / POSITIVE SAFETY PROTECTION TRIP

5�7�4� INPUT SENSOR ERROR TRIP

5�8�1� “MANUAL” RECLOSING SYSTEM WITH THE RESET KEY

5�8�2� RECLOSING SYSTEM WITH THE EXTERNAL TEST/RESET INPUT

6�- TECHNICAL FEATURES

6.1.- DIMENSIONS

7�- MAINTENANCE AND TECHNICAL SERVICE

8�- WARRANTY

9�- CE CERTIFICATE

APPENDIX A: TRIP CURVES