Sonel ERP-1 Electric Adapter User Manual

Sonel ERP-1 Electric Adapter

Product Information

• Specifications
  • Model: ERP-1
  • Does not exclude the need to comply with occupational health and safety regulations and with other relevant fire regulations required during the performance of a particular type of work.
  • Before starting the work with the device in special environments, e.g. potentially fire-risk/explosive environments, it is necessary to consult it with the person responsible for health and safety.
  • It is unacceptable to operate the device when:
  • it is damaged and completely or partially out of order,
  • its cords and cables have damaged insulation
  • Version: v1.7
  • Date: 22.02.2024
  • Manufacturer: SONEL S. A.
  • Address: ul. Wokulskiego 11, 58-100 widnica

Product Usage Instructions

• Safety
  • Repairs should only be carried out by authorized service centers. The device complies with the PN-EN 61010-1 standard. The manufacturer reserves the right to make changes to the appearance, equipment, and technical data of the adapter.
• Description of the Adapter
  • The ERP-1 adapter is not a standalone measuring device but an accessory.
• Measurements
  • Turn on the adapter by pressing the power button.
  • The measurement indicator LED will light up for approximately 5 seconds, indicating system stabilization.
  • Connect the adapter to the MRU meter using a 2-meter cable labeled “ERP-1.”
  • Attach the flexible current transformer (Rogowski coil) to the adapter.
  • Connect the adapter to the object’s legs.
  • Select the measurement method on the MRU meter by setting the function switch to the appropriate position.
  • Initiate the measurement on the MRU meter by pressing the START button after selecting the voltage and frequency of the network under test.
  • Proceed to measure each leg of the object sequentially.
• Powering the Adapter
  • Monitoring Power Supply Voltage: It is important to recharge the batteries in an external charger.
• Cleaning and Maintenance
  • Follow the maintenance methods specified by the manufacturer in this manual. The electronic system of the adapter does not require maintenance.
• Storage
  • Periodically remove and recharge the batteries in an external charger. Dispose of used electrical and electronic equipment selectively.

FAQs

• Q: Can I use the adapter without connecting it to a meter?
  • A: No, the adapter needs to be connected to a meter for proper functionality.
• Q: How often should I recharge the batteries?
  • A: It is recommended to recharge the batteries periodically, especially when monitoring indicates low voltage levels.

Safety

ERP-1 adapter is designed to adapt MRU meters (manufactured by Sonel SA) for the measurements of earth resistance of various objects e.g. power pillars, using flexible clamps (Rogowski coil). The adapter is designed to work with earth resistance meters that provide the user with a choice of performing the measurement using the 3-wire method with measurement clamps. To ensure correct operation, the following recommendations must be observed:

• Before you proceed to operate the adapter, acquaint yourself thoroughly with this manual and observe the safety regulations and specifications provided by the producer.
• Any application that differs from those specified in the present manual may result in damage to the adapter and constitute a source of danger for the user.
• The Adapter should be operated only by suitably qualified persons having the necessary permissions to carry out measurements on electrical systems. Operating the Adapter by unauthorized personnel may result in damage to the device and constitute a source of danger for the user.
• Using this manual does not exclude the need to comply with occupational health and safety regulations and with other relevant fire regulations required during the performance of a particular type of work. Before starting the work with the device in special environments, e.g. potentially fire risk/explosive environment, it is necessary to consult with the person responsible for health and safety.
• It is unacceptable to operate the device when:
• it is damaged and completely or partially out of order,
• its cords and cables have damaged insulation,
• it has been stored for an excessive period in disadvantageous conditions (e.g. excessive humidity). After moving the device from a cool to a warm place with a high level of relative humidity, do not start measurements until the device is warmed up to the ambient temperature (approximately 30 minutes).
• Do not operate the adapter with an open or incorrectly closed battery (accumulator) compartment or power it from other sources than those specified in the present manual.
• Repairs may be performed only by an authorized service point.
• The device meets the requirements of EN 61010-1.
• The manufacturer reserves the right to introduce changes in the design, accessories, and technical data of the adapter.
• ERP-1 Adapter is not a stand-alone measuring device. This is an accessory designed to work with earth resistance meters of the MRU series manufactured by SONEL S.A.

Description of the adapter

Measurements

NOTE: Before the measurement arrange the spacing of the electrodes and the test leads taking into account considerable distances. In case of truss structures, the distance between the legs at their base may exceed a few meters. The spot of connecting the meter to the structure with a cable from terminal E, should be free of dirt and contaminants such as paint, rust, etc., as they may affect the measurement result.

1. Turn the adapter ON by pressing the button.
2. LED will light up for 5 seconds indicating the stabilization process of the measuring system.
3. LED will turn off and at the same time LEDs for selecting clamps and indicating the number of wraps around the structure leg will light up: .
4. Connect the adapter to the MRU meter using the cable (length: 2 m) coming out from the terminal marked with letters . This cable is an integral part of the ERP-1 adapter.
5. Connect flexible clamps (Rogowski coil) to the adapter using the cable coming out from the terminal marked with a symbol .
6. Press the button on the adapter to select the type of flexible clamps – follow the labeling on the clamps.
7. Press the button on the adapter to specify the number of clamp wraps around the leg of the structure/object.
8. On the MRU meter select the measurement method as 3p+clamps, setting the rotational function selector in the position shown here:
9. Flexible clamps connected to the ERP-1 adapter should be wrapped around the leg of the structure and the steel strip (hoop) – if present – below the connecting point of cable E to the structure leg. (Remember that flexible clamps should not be placed directly onto the test leads as their interference may impact the measurement results). Wrap the clamps as many times as its possible due to their length (max 4 times).
   • When wrapping the clamps around the leg of the tested structure, remember that the arrow stamped on the clamps (indicating the direction of current flow) should be downward (indicating the ground).
10. Trigger the measurement on the MRU meter by pressing the START button, after selecting the measuring voltage and frequency of the tested network.
11. After completing the measurement on the first leg of the structure/object (when there is more than one leg), proceed to perform a similar measurement on the next leg.
12. After obtaining the results of earth resistance for each leg, calculate the resultant resistance of the whole structure, using the formula [1].
    • where:
    • RE – resultant resistance of the object,
    • R1 – resistance of the first leg of the object,
    • Rn – resistance of the last leg of the object,
    • n – number of legs of the object.
    • In the case of measurements on a damaged structure or a structure with a defective grounding system, the result calculated with the above formula [1] may be burdened with a considerable error.
    • IE1…IE4 – current flowing to the ground through the individual legs of the pole
    • IS – current flowing upwards to the lightning protection wire
    • E, S, H – markings on the meter sockets
    • Fig. 1 Schematic diagram of the static resistance measurement on electricity poles using measurement clamps and MRU-200 meter.
    • Before using FLEX clamps for the first time, they should be calibrated according to the description included in the u of MRU earth resistance meter.
    • Repeat the procedure each time you change the clamps. It is recommended to perform the calibration every time the clamp type is changed.
    • The number of wraps (coils) of clamps around the leg of the pole during the measurement should be identical to the number of wraps used during their calibration. This will ensure using the appropriate calibration factor during the measurements.

APPENDIX for MRU-200 and MRU-200-GPS METERS

As additional functions are available in MRU-200 and MRU-200-GPS meters (measurements with flexible clamps), the manufacturer provided an additional option for automatic calculation of the resultant resistance of the measurement system. Please upgrade your MRU-200/MRU-200-GPS meter to the latest software version, available at: www.sonel.pl ► DOWNLOAD ► FIRMWARE.

• a) After selecting 3P+clamps, the following screen is displayed:
• b) After pressing the F2 button, the window for selecting clamps is shown. You may select between hard clams (C-3) and ERP-1 adapters by operating buttons , . Accept your choice by pressing ENTER. Exit without saving the change by pressing ESC.
• c) After pressing F3 you may select the number of legs of the tested structure/object using buttons , . Accept your choice by pressing ENTER. Exit without saving the change by pressing ESC.
• d) After selecting an object with four legs the following screen is shown. After connecting the clamps to the ERP-1 adapter and connecting the adapter to the meter; when the number of wraps and type of clamps are set, the right side of the screen will show the following values: UN – interference voltage, fN – interference frequency and IL – leakage current:
• e) Press the START button to display the following screen. Follow the command on the screen and fix the clamps to the first leg (if not already done). The measurement will be triggered by pressing again START button.
• f) This screen is shown for 5 seconds from the moment of displaying the calculated R1 value, and then the screen “before the second measurement” will be shown. You may recall the last measurement result by pressing ENTER (the screen with the first measurement is shown for 5 seconds).
  • Similar to the situation before the first measurement. The same applies before the measurement on the third and fourth leg.
• g) After completing the measurements on the last leg of the structure and after displaying (for 5 seconds) the resistance result (R4), the following screen will be displayed:
• After completing a series of measurements (on each leg), the screen will display the resultant earth resistance RE. Use buttons► and ►to change results displayed by the auxiliary screen on the right.

The power supply of the adapter

Monitoring the power supply voltage

• The adapter is powered by three 1.5 V LR6 batteries or by three 1.2 V LR6 rechargeable batteries of NiMH type.
• When BAT LED is lights up, it indicates the need to replace the batteries or to recharge the rechargeable batteries.

Replacing (rechargeable) batteries

• To replace the (rechargeable) batteries:
  • disconnect the clamps and switch the adapter off,
  • unscrew the screw, and remove the cover of the battery compartment (in the bottom of the housing).
  • replace all (rechargeable) batteries, observing the correct polarity.
  • install the cover back and fix it with the screw.

NOTE! Do not use the adapter when the battery compartment is removed or open. Do not power the meter from other sources than those mentioned in this manual.

Charging the rechargeable batteries

• Rechargeable batteries must be recharged in an external charger.

Cleaning and maintenance

UWAGA!

• Use only the maintenance methods specified by the manufacturer in this manual.
• The casing of the adapter may be cleaned with a soft, damp cloth using all-purpose detergents.
• Do not use any solvents or cleaning agents that might scratch the casing (powders, pastes, etc.).
• Clamps and test leads should be cleaned with water and detergents and then dried.
• The electronic system of the Adapter does not require maintenance.

Storage

• During the storage of the device, the following recommendations must be observed:
  • disconnect the clamps from the adapter.
  • thoroughly clean the adapter and clamps.
  • If adapter is to be stored for a prolonged period of time, the batteries must be removed from the device.
  • In order to prevent a total discharge of the battery in the case of a prolonged storage, remove and charge the batteries in an external charger from time to time.

Dismantling and Disposal

• Worn-out electric and electronic equipment should be gathered selectively, i.e. it must not be placed with waste of another kind.
• Worn-out electronic equipment should be sent to a collection point in accordance with the law of waste electrical and electronic equipment.
• Before the equipment is sent to a collection point, do not dismantle any elements.
• Observe local regulations concerning disposal of packages, waste batteries and accumulators.

Technical specifications

• Abbreviation “m.v.” used in the specification of measurement accuracy means a standard meas-ured value.

Basic data

Flexible clamps F RE measurement
Accuracy of the adapter:

• for RE > 500 Ω accuracy unspecified
• Accuracy specified for MRU-200/MRU-200-GPS
• For flexible clamps, accuracy F is not specified.

Current measurement

• unspecified in the range of 0 mA…199 mA
• above 5 A the accuracy is unspecified

Flexible clamps FS-2

RE measurement Accuracy of the adapter

Accuracy specified for MRU-200/MRU-200-GPS

• for RE > 500 Ω accuracy unspecified

Current measurement

above 5 A the accuracy is unspecified

Flexible clamps FSX-3

RE measurement Accuracy of the adapter

Accuracy specified for MRU-200/MRU-200-GPS

• for RE > 500 Ω accuracy unspecified

Current measurement

• unspecified in the range of 0 mA…50 mA
• above 5 A the accuracy is unspecified

Other technical data

• a) type of insulation acc. to EN 61010-1 and IEC 61557 ………………………………………………………………………………….. double
• b) measurement category acc. to EN 61010-1 …………………………………………………………………………………………….. IV 300 V
• c) degree of housing protection acc. to EN 60529 ……………………………………………………………………………………………… IP67
• d) power supply of the meter …………………………………………………………………………………………………… 3 LR6 1.5 V batteries …………………………………………………………………………………………………………….. 3 NiMH LR6 1.2 V rechargeable batteries
• e) time of automatic shut-off of the device (Auto-Off) ………………………………………………………………………………. approx. 2 h
• f) dimensions ……………………………………………………………………………………………………………………………. 146 x 88 x 33 mm
• g) weight of the adapter with batteries ………………………………………………………………………………………………… approx. 340 g
• h) operating temperature ………………………………………………………………………………………………………………………. -10..+50C
• i) reference temperature ………………………………………………………………………………………………………………………….. 23 ±2C
• j) storage temperature …………………………………………………………………………………………………………………………. -20..+80C
• k) relative humidity ……………………………………………………………………………………………………………………………………. 20..90%
• l) nominal relative humidity ……………………………………………………………………………………………………………………….. 40..60%
• m) altitude (above sea level) ……………………………………………………………………………………………………………………… <2000 m
• n) electric field ………………………………………………………………………………………………………………………………………. max 3 V/m
• o) quality standard, ………………………………………………………………………. design and manufacturing are ISO 9001 compliant
• p) the product meets the EMC requirements according to ……………………………………………. EN 61326-1 and EN 61326-2-2

Additional data

Thresholds for triggering NOISE LED for sinusoidal current of 50 Hz

Additional uncertainty of the electrodes determined for MRU-200/MRU-200-GPS

Manufacturer

The manufacturer of the device and provider of guarantee and post-guarantee service:

• SONEL S.A.
• Wokulskiego 11
• 58-100 Świdnica
• Poland
• tel. +48 74 884 10 53 (Customer Service)
• e-mail: customerservice@sonel.com.
• web page: www.sonel.com.

NOTE! Service repairs must be performed only by the manufacturer

CONNECTION

CONTACT

• SONEL S.A. Wokulskiego 11 58-100 Swidnica Poland
• Customer Service tel. +48 74 884 10 53
• e-mail (GLOBAL):customerservice@sonel.com.
• e-mail (PL): bok@sonel.pl.
• www.sonel.com.

References

• Sonel S.A.
• Sonel S.A.
• Sonel S.A.

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