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Mecc Alte ECO 38 Series User Manual

Self-regulating alternators
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EN
User manual
Self-regulating
Alternators
Series ECO 38
Series ECO 40
Operating and maintenance instructions
Code: Series ECO-C
Revision: 5
Data: 05/2025
Translation of original language

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Summary of Contents for Mecc Alte ECO 38 Series

  • Page 1 User manual Self-regulating Alternators Series ECO 38 Series ECO 40 Operating and maintenance instructions Code: Series ECO-C Revision: 5 Data: 05/2025 Translation of original language...
  • Page 3 3.5 Residual risks 4 Transport, handling and storage 4.1 General warnings 4.2 Packing materials lifting and transportation 4.3 Unpacking 4.4 How to dispose of the packing materials 4.5 Alternator Movement Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 4 9.2.3 Summary table of maintenance operations in case of failure 9.3 Ordinary maintenance 9.3.1 General Cleaning 9.3.2 Air filter cleaning (if present) 9.3.3 Visual Inspection 9.3.4 Verification of winding state Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 5 9.6.2 ECO40 series 9.7 Disc tightening torques 9.8 Terminal block tightening torques 10 Alarm management DSR / DER1 10.1 DSR/DER1 digital regulator alarms 11 Malfunctions, causes and remedies Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 6 13.1 ECO 38C construction form MD35 13.2 ECO 38C Construction type B3B14 13.3 ECO 40C Construction type MD35 13.4 ECO 40C Construction type B3B14 14 Decommissioning and disposal Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 7: Intended Users

    MECC ALTE S.p.A. MECC ALTE S.p.A. is not responsible or liable for any damages suffered by people or things as a result of improper use not indicated in this manual and by failure to comply with the specifications of the technical characteristics table pertaining to every model.
  • Page 8 Caution In case the manual is lost or damaged ask for a copy from the Manufacturer indicating its identification data: document name, code, revision number and issue date. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 9: How To Consult The Manual

    This symbol indicates a CROSS REFERENCE; the presence of a module, of a drawing or of an annexed document that should be consulted and, if required, filled in. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 10 Technical standards to be applied by the installer ● ISO 8528-9 : Reciprocating internal combustion engine driven alternating current generating sets Part 9: Measurement and evaluation of mechanical vibrations. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 11 Ask for a new nameplate if the one attached to the alternator cannot be read anymore. The nameplate is affixed on the alternator in the position indicated in the figure. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 12: Declaration Of Conformity

    Below a copy of the declaration of conformity of the product. The original is placed inside the terminal box of every alternator. A true copy may be requested in case of loss. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 13 Self-regulating Alternators Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 14 The Customer may resort to the technical and commercial support provided by the area representatives or by foreign branches, which are in direct contact with MECC ALTE S.p.A. and have their addresses and contact data indicated on the back cover.

  • Page 15: Main Components

    Special treatments may also be carried out on request. Main components Rotating Inductor Mounting Feet Cooling fan Protection Grid Main rotor Front Cover Exciter Rotor Shaft Terminal Box Stator Frame Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 16 Upon customer request, the M3K/M3Ks/M3KsHD digital regulator can be supplied on the 38 / 40 series. The regulator is normally installed in the terminal box of the alternator. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 17 The DSR/DER1 digital regulators are equipped with an LED Indicator. During normal operation the LED blinks with a 2-second period and a 50% duty cycle (1 second on, 1 second off), in case of faults it flashes differently. See graphs in chapter "Gestione allarmi". Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 18: Technical Data

    Data: 05/2025 Technical data 2.3.1 Dynamic Data Support (DDS) For the most up-to-date and detailed technical information, we invite you to visit the support area of the Mecc Alte website: http://support.meccalte.com/ Here you will find our Dynamic Data Support (DDS), an advanced system for the dynamic generation of technical data sheets.

  • Page 19: Environmental Operating Conditions

    0.05 3000 0.04 0.05 3600 0.03 0.05 2.3.4 Materials The table below contains the approximate percentages of the materials used in Mecc Alte S.p.A's alternators. Material Percentage Steel Parts Cast Iron Parts Copper Parts Aluminum Parts Plastic Parts Electronic parts...
  • Page 20 At the end of each operation that involved removal of the safeguards, put them back and make sure that the correct positioning and efficiency are restored. Danger Keep the alternator at a safe distance from flammable materials. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 21: Safety Tags

    Do not remove under any circumstances the tags attached to the alternator. The following safety tags are attached to the machine Caution The labels must be replaced if they are worn out or cannot be read anymore. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 22: Personal Protective Equipment

    Before touching the alternator wait for it to cool off. Caution Risk of crushing while lifting. Do not stand under the suspended load, do not come close to it, use adequate PPE. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 23: Transport, Handling And Storage

    Always make sure that the devices and means for packing materials removal, the alternator and any disassembled part are suitable and undamaged. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 24 Unpack the alternator carefully without breaking/damaging the packing materials. Both the cases (equipped with metal hinges so that they may be folded) and the pallet must be returned to Mecc Alte. Once the single-bearing alternator is unpacked do not cut the tie strips of the rotor to prevent it from sliding.
  • Page 25 If the result of the test is too low (less than 5 MΩ) you will have to dry the alternator by blowing 50-60 C° pressurized air into the air intakes and exhausts of the alternator. Normally, alternator coming out of Mecc Alte always have insulation values above 500MΩ. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not...

  • Page 26: Installation Setup

    (such as vibrations, misalignments, various kinds of mechanical stresses). dis_ECO_049-r00 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 27: Mechanical Coupling

    Remove the rotor fastening system, if present. During the mechanical coupling procedures do not use the fan as a lever to turn the rotor. dis_ECO_041-r00 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 28 For alignment tolerances see par. The presence of flexures on the alternator coupling flange may cause high vibrations and in the worst cases even mechanical breaks. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 29 = Coefficient of thermal expansion (value α = 10 x 10-6 K-1 may be used). ΔT = Difference between the alignment temperature and the operating temperature. H = Axle height. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 30 L = Shaft length, calculated between the bearing and the drive motor coupling discs. dis_ECO_039-r00 The variation of the axial tolerance is calculated by relating the axial thermal expansion of the alternator to that of the motor. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 31: Electrical Connection

    For the electrical connection use adequate cables, sized on the basis of the alternator power. Make the connections to the terminals as shown in the figure. A) Hexagon nut B) Plain washer C) User cable See paragraph 6.1. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 32 (YY) / 460 V (Δ) / 800 V (Y) in the 40 standard series. To pass from a connection to another follow the diagrams shown in the "12 wires connection" table on the next page. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 33 20% (unvaried current) if the voltage increases by 20%. For alternators specifically built for a 60Hz frequency when passing to 50Hz the voltage and the power must be reduced by 20% in relation to the values referring to 60Hz. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 34 Self-regulating Alternators Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 Terminal board configurations 6.1.1 ECO 38 regulator box Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 35 Plain washer Ø3 (n.4) TE Self-forming screw M6x10 (n.2) T.E. M3 nut (n.4) Tightening torque 9Nm PD500 DG21 plug Socket head bolt M4x10 (n.4) Busbar (n.4) Toothed washer Ø4 (n.4) Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 36 Self-regulating Alternators Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 6.1.2 ECO 40 regulator box Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 37 Tightening torque 9Nm Plain washer Ø3 (n.4) DG21 plug T.E. M3 nut (n.4) Busbar (n.4) Support C.T. bracket Socket head bolt M8x25 (n.4) Contact washer Ø8 (n.8) Tightening torque 25Nm Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 38 Check the no load voltage of the alternator and if necessary act on the electronic regulator VOLT trimmer to move back to the nominal value. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 39: Initial Start-Up Instructions

    The rotors of the Mecc Alte alternators and the alternators themselves comply with the regulations (see paragraph 1.5). This means that the vibrations generated by the Mecc Alte alternators are very limited and compliant with the regulations.
  • Page 40 –5% to + 20%. Remote Regulation To achieve remote regulation insert a 10KΩ potentiometer in the dedicated terminals 10-11. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 41 It is important to stress that Mecc Alte's alternators are tested using an electric motor, not a heat engine. Therefore, STAB adjustment is set correctly for the alternator driven by an electric motor.
  • Page 42 The basic settings may be performed directly on the regulator through the 4 trimmers (VOLT - STAB - Hz - AMP), the 50/60 jumper and the Vext input. More detailed settings and measures may be performed only via software using, for instance, the Mecc Alte USB2DxR communication interface and the DxR_Terminal software.
  • Page 43 140V to approximately 280V when terminals 6 and 7 are used. STAB Trimmer It regulates the dynamic response (droop) of the alternator under transient conditions. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 44 Even if still continuing to regulate the voltage, the DSR goes into switch-off mode when the frequency decreases under 20 Hz. To restore it you need to shut down the alternator completely. Alarm management See par. 10.1 Wiring diagrams See par. 12.1 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 45 1X5 p.2.54 mm strip connector that is mounted directly on the card. The alternators being equal, the DER2 regulator settings are the same as DER1. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 46 It is important to stress that Mecc Alte's alternators are tested using an electric motor, not a heat engine. Therefore, STAB adjustment is set correctly for the alternator driven by an electric motor.
  • Page 47 * They are connected together on the board the following terminals: 2 and 3; 4 and 5; 6 and 7; 9 and 10, 11 and 12. ** Minimum supply voltage 40Vac at 15Hz, 100V at 50Hz, 115V at 60Hz. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 48 The basic settings may be performed directly on the regulator through the 4 trimmers (VOLT - STAB - Hz - AMP), the 50/60 jumper, JP1, JP2 and the Pext input. More detailed settings and measures may be performed only via software using, for instance, the Mecc Alte USB2DxR communication interface and the DxR_Terminal software.
  • Page 49 It opens (with a software programmable delay of 1 to 15 seconds) when, one or several alarms, that may be selected separately via software, are active. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 50 Even if still continuing to regulate the voltage, the DER1 goes into switch-off mode when the frequency decreases under 20 Hz. To restore it you need to shut down the alternator completely. Alarm management See par. 10.1 Wiring diagrams See par. 12.2 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 51 Position the external potentiometer at half scale and connect it with the corresponding terminals of the electronic regulator. ● Adjust the voltage to the nominal value through the VOLT trimmer of the electronic regulator. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 52 All the alternators in the ECO series may also be operated with manual regulation, without the assistance of external supplies and with the simple use of one rheostat. See par. 12.4 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 53 Carefully perform the test, use adequate PPE such as for instance insulating gloves. For information regarding the MxK regulator line, please refer to the regulator manual that you will find in our download area at the following link: https://www.meccalte.com/en/download-area Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 54: Maintenance

    It is advisable for the maintenance technician to keep a register of all the interventions. The ECO series alternators are built to operate without maintenance for a long time. The maintenance interventions on the Mecc Alte alternator are divided into ordinary and extraordinary. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not...

  • Page 55: Table Of Contents

    9.4.3 hours / 1 year Check correct fastening of PMG (optional Every 8000 9.4.4 component) hours / 1 year Every 20000 to Cleaning of windings 9.4.5 25000 hours Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 56 DSR test and setup on test bench 9.5.14 DER1 test and setup on test bench 9.5.15 DER 2 test and setup on test bench 9.5.16 Main stator windings voltage test 9.5.17 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 57: Ordinary Maintenance

    The periodicity of intervention on the air filters will depend on the severity of the conditions at the installation place. However a regular inspection of these components will allow you to determine if you should intervene. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 58 Open the four latches (1). Remove the internal components of the filter and clean. Remove the cover (1). Remove the filter elements (2) and clean. Reassemble everything according to the initial configuration. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 59: Visual Inspection

    Check the tightening of the power cables and of the regulator cables. ● Check the state of the insulations of the power cables and of the regulator cables (overtemperature, rubbing). Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 60: Every 2500

    If the value is lower than 5MΩ dry the windings with a jet of hot air at 50-60°C. Direct the jet of air into the air intakes and exhausts of the alternator. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 61: Every 2500

    Disconnect the alternator from the power supplies. The drive motor must be off and unplugged from its power supplies. ● Check the tightening status of the bolts (see par. 9.6). ● Check the electrical connections. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 62 IP23 and therefore by using liquids anomalies or even short circuits may occur. The intervention periodicity indicated refers to critical environmental conditions. Adapt the periodicity based on the actual conditions of use. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 63: Extraordinary Maintenance

    It is mandatory to verify, for all machines equipped with a grease nipple, that the required lubrication intervals are respected. In fact, re-greasable bearings need to work ONLY if suitably lubricated. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 64: Every 8000 Hours / 1 Year

    Disconnect the alternator from the power supplies. The drive motor must be off and unplugged from its power supplies. Mecc Alte's digital regulator are equipped with a special connector that allows you to download the data related to the recorded alarms.

  • Page 65: Every 8000 Hours / 1 Year

    You can add the PMG accessory to the ECO series alternators manufactured by Mecc Alte. In case this accessory is present, make sure it is correctly attached. See paragraph 9.5.6. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 66: Every 20000 To 25000 Hours

    After the drying process at approximately 60-80°C is finished you must check again the insulation resistance of the windings. In case you notice a degradation of the winding paint, paint them again. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 67 C. Secure the fan with the appropriate Seeger ring (7). D. Tighten the bolts (Y) at 38 ± 5 Nm for the 38 series, at 40 ± 5 Nm for the 40 series. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 68 ECO 40 A 20x12x70 9911130595 Ø 10 flat washer 6110613053 Ø 10 serrated washer 2 6110603250 ECO 38 D. 95 Seeger 9911136245 ring ECO 40 D. 120 9911136265 Seeger ring Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 69 Once the sector or the entire bridge is replaced, tighten the corresponding screws with the correct tightening torques (see paragraph 9.6), and respecting the polarity. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 70 Clean them and, if necessary polish them. If the degree of wear of the shaft is too high, take it to a service center for repair or replacement. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 71 See par. 9.5.17 The internal windings of the machine might need accurate cleaning. Use an appropriate solvent or hot water. Dry them and, if necessary, impregnate them again. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 72 4) Remove the drive end bracket using a soft hammer. Note that the position of the drive end bracket and non drive end bracket respect of the frame was signed using a pen. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 73 8) When possible position a soft rope in the rotor pack, and during the extraction of the rotor move the rope till it reach the equilibrium point. Lift the rotor and position it in a secure place. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 74 9) Using an opportune extractor, remove the bearing from the shaft. Remove the exciter rotor using an arms puller. 10) Remove the screw of the exciter stator. 11) Using a leverage, remove the exciter stator. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 75 Clean them and, if necessary polish them. If the degree of wear of the shaft is too high, take it to a service center for repair or replacement. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 76 See paragraph 9.5.10; 9.5.11; 9.5.12; 9.5.13. The internal windings of the machine might need accurate cleaning. Use an appropriate solvent or hot water. Dry them and, if necessary, impregnate them again. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 77 Use a felt pen to mark on the exciter rotor the position of the key on the shaft. Secure the exciter stator to an appropriate lifting device using a soft belt. Remove it with the appropriate Mecc Alte extractor. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 78 Tap with a rubber mallet to remove it from the frame. Hook the back cover to a lifting device. Use an extractor to push the shaft until the bearing comes out completely from its housing. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 79 As soon as the rotor sticks out enough, support it with a second soft belt. Remove it from the frame and put it in a safe place. Use an extractor to remove the bearing. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 80 (see image on the side), then push the stator till the bracket with a soft hammer. Insert its screw and tighten it as 9.6. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 81 4) Using opportune anti-scald gloves, insert the bearing till the shaft shoulder. 5) Lift the rotor using a soft rope, insert it in the stator and pull it till the stator and rotor pack are aligned. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 82 Then fix the rear grid and the cover of the terminal box. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 83 Insert the new bearing on the shaft, push it to the end stop. Wait for the bearing to cool off. Then start reassembling the alternator. Lift the rotor using two soft belts. Introduce the rotor in the frame. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 84 Fasten the screws on the Z Fasteners (for 38 Series) or the rods (for 40 Series) to the tightening torques. (See par. 9.6). Fasten the cables of the main rotor to the shaft with a strap. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 85 Insert the rotating diode bridge and screw in the 3 M5 screws to 3.3 Nm. Rewire the three cables of the exciter rotor and the two cables of the main rotor in their initial configuration. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 86 D. Remove the 4 M8 screws . Use a lever to remove the PMG device from the exciter stator, being careful not to remove the exciter stator too. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 87 8 M6 screws applying a 9 Nm torque. F. Insert the PMG IP23 protective cover (6) and screw in the 4 M5 screws applying a 3.5 Nm torque. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 88 (7). Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 89 H. Insert the special IP23 back grid and screw in the 8 M6 screws applying a 9 Nm torque (9). I. Position the last terminal box panels and screw in the screws applying a 9Nm torque (10). Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 90 1) Remove flywheel from hub, mount an apposite hydraulic or pneumatic extractor and pressurize it. 2) Heat up the hub with an oxyacetylene torch, maintaining continuosly pulling the extractor till the complete extraction of the hub. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 91 This will allow for a balanced machine and proper cooling of the alternator during its operation. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 92 Heat the disc holder hub. Use two oxyacetylene heating torches. Keep the extractor under pressure until full extraction of the hub. Before reassembling the hub heat it to 250 °C for 1 hour. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 93 Prepare two terminals connected to a 12 Vdc battery possibly with a 5 Ω resistance in series. ● Use the electrical diagrams provided by Mecc Alte to identify the “+” and “-“ terminals of the electronic regulator. ● Start the alternator.
  • Page 94 To avoid creating new alarms, the copy of the data and alarms existing in the regulator (.dat and .alr files) must be made feeding the alternator with an appropriate continuous voltage, in accordance with the diagrams below. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 95 L[55] for the SN-equipped regulators with a blue tag, to a lower value than the value of the previously read L[45] parameter. Check the intervention of the AMP protection (alarm 5). Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 96 Mecc Alte. In case you detect anomalous behavior please refer to the specific regulator manual or contact Mecc Alte's technical support service Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not...
  • Page 97 DSR 48Vdc power supply for the download of the alarms without risking to change to content of the EEPROM because of the tests. No other connections besides the power supply are needed. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 98 DSR 140-270Vac power supply for testing and setup. The fictitious load between terminals 1 and 2, the sensing on terminal 5 and the bridge between terminals 3 and 4 of the DSR. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 99 DER1 48Vdc power supply for the download of the alarms without risking to change to content of the EEPROM because of the tests. No other connections besides the power supply are needed. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 100 DER1 150-150Vac power supply for test and setup. The fictitious load between terminals 1 and 2, the sensing on terminal 4 and the bridge between terminals 5 and 14, 12 and 17, 19 and 22. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 101 DER1 48Vdc power supply for the download of the alarms without risking to change to content of the EEPROM because of the tests. No other connections besides the power supply are needed. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 102 DER2 150-270Vac power supply for test and setup. The fictitious load between terminals 1 and 2, the sensing on terminal 4 and the bridge between terminals 5 and 14, 12 and 17, 19 and 22. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 103 If the voltage is lower than 15% of the nominal voltage, there might be a problem with the regulator, in the rotating diode bridge or in the exciter winding. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 104 (blue) with a multimeter. For values, see par. 2.3 Exciter rotor Measure the resistance/continuity of the winding of the exciter rotor between phases with a multimeter. For values, see par. 2.3 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 105 If the insulation resistance is lower, the rotor must be cleaned and, if necessary, impregnated and then dried at 50-60 °C. If after these operations the value remains low, the rotor must be rewound or replaced. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 106: General Tightening Torques

    M4 X 25 CL. 4.8 M5 X 12 CL. 4.8 Diode bridge CL. 4.8 Flywheel Flywheel 11.5 M12 X 55 CL. 8.8 Flywheel 14 M12 X 30 CL. 8.8 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 107 CL. 8.8 Back IP45 air filter M6 X 16 CL. 4.8 M8 X 35 CL. 8.8 M14 X 120 CL. 10.9 120 ± 10% M5 X 12 CL. 8.8 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 108 M5 X 20 CL. 4.8 Diode bridge M5 X 20 Brass M5 X 25 Brass Flywheel Flywheel 14 M16 X 45 CL. 8.8 Flywheel 18 M16 X 40 CL. 8.8 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 109 CL. 8.8 M8 X 35 CL. 8.8 M14 X 160 QT Steel 120 ± 10% M5 X 12 CL. 8.8 Front bearing protection flange M6 X 65 CL. 8.8 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 110 M16x45-8.8 200 ± 10% 15,7 M16x40-8.8 200 ± 10% Terminal block tightening torques THREAD TYPE TIGHTENING DIAMETER Df TORQUE (Nm) ECO38 80 ± 7% ECO40 100 ± 7% Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 111 During normal operation a LED indicator mounted on the card flashes with a 2 second period and 50% duty cycle. In case of intervention or signaling of any alarm there are different flashing modes available, as shown in the figure below. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 112 The available parameter is the "threshold", which determines, in the end, the balance value at which the system stabilizes. The alarm is signaled and memorized. For the adjustment see paragraph "Excitation overcurrent". Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 113 L[56]: if the value of L[56] is higher than the upper (fixed) threshold or lower than the value of the lower threshold (parameter P[27]), A-08 is activated. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 114: Malfunctions, Causes And Remedies

    Readjust the voltage and/or stability. (see At load, voltage is Regulator is not adjusted. paragraph 8.1.1 and 8.2.1). higher than nominal voltage. Regulator is not adjusted. Replace the regulator. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 115 Check alignment between alternator and motor. drive motor (see paragraph 5.3.2). For any other anomaly please contact the reseller, in the authorized service centers or directly at Mecc Alte. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 116: Wiring Diagrams

    6 terminals - three-phase reference A2548 UVR6 12 terminals - three-phase reference A2552 12 terminals - ZIG-ZAG connection, single-phase reference SCC0055 UVR6 12 terminals - ZIG-ZAG connection, single-phase reference SCC0054 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 117 Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 12.1 DSR digital regulator wiring diagrams SCC0062: Alternators with 12 terminals with reference on half phase from 70 V to 140 V. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 118 Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 SCC0063: Alternators with 12 terminals for star or delta connections, reference on the entire phase from 140 V to 280 V. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 119 Self-regulating Alternators Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 SCC0064: Alternators with 12 terminals with reference on half phase from 140 V to 280 V. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 120 SCC0161: Alternators with 12 terminals, 150 V - 300 V single-phase sensing. The electric scheme is valid also in case of use of the DER2 regulator instead of the DER1 regulator, represented in the scheme Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 121 SCC0160: Alternators with 12 terminals, single-phase reference from 75 V to 150 V. The electric scheme is valid also in case of use of the DER2 regulator instead of the DER1 regulator, represented in the scheme Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 122 SCC0159: Alternators with 12 terminals, three-phase reference from 150 V to 300 V. The electric scheme is valid also in case of use of the DER2 regulator instead of the DER1 regulator, represented in the scheme Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 123 SCC0158: Alternators with 12 terminals, three-phase reference from 75 V to 150 V. The electric scheme is valid also in case of use of the DER2 regulator instead of the DER1 regulator, represented in the scheme Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 124 SCC0298: ECO40 series alternators with 12 terminals, single-phase reference from 150 V to 300 V. The electric scheme is valid also in case of use of the DER2 regulator instead of the DER1 regulator, represented in the scheme Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 125 SCC0296: ECO40 series alternators with 12 terminals, single-phase reference from 75 V to 150 V. The electric scheme is valid also in case of use of the DER2 regulator instead of the DER1 regulator, represented in the scheme Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 126 SCC0297: ECO40 series alternators with 12 terminals, three-phase reference from 150 V to 300 V. The electric scheme is valid also in case of use of the DER2 regulator instead of the DER1 regulator, represented in the scheme Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 127 SCC0295: ECO40 series alternators with 12 terminals, three-phase reference from 75 V to 150 V. The electric scheme is valid also in case of use of the DER2 regulator instead of the DER1 regulator, represented in the scheme Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 128 SCC0202: Alternators with 12 terminals, single-phase reference from 300 V to 600 V. The electric scheme is valid also in case of use of the DER2 regulator instead of the DER1 regulator, represented in the scheme Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 129 SCC0203: Alternators with 12 terminals, ZIG-ZAG connection, single-phase reference from 300 V to 600 V. The electric scheme is valid also in case of use of the DER2 regulator instead of the DER1 regulator, represented in the scheme Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 130 SCC0236: Alternators with 12 terminals, single-phase reference from 150 V to 300 V The electric scheme is valid also in case of use of the DER2 regulator instead of the DER1 regulator, represented in the scheme Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 131 SCC0237: Alternators with 12 terminals, single-phase reference from 75 V to 150 V The electric scheme is valid also in case of use of the DER2 regulator instead of the DER1 regulator, represented in the scheme Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 132 12.3 Wiring diagrams with PMG SCC0155: Alternators with 12 terminals, with PMG, DSR regulator. (Terminal 4: reference from 140V to 280V, terminal 6: reference from 70V to 140V). Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 133 SCC0231: Alternators with 12 terminals, with PMG, DER1 regulator, single-phase reference from 75V to 150V. The electric scheme is valid also in case of use of the DER2 regulator instead of the DER1 regulator, represented in the scheme Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 134 SCC0232: Alternators with 12 terminals, with PMG, DER1 regulator, single-phase reference from 150V to 300V. The electric scheme is valid also in case of use of the DER2 regulator instead of the DER1 regulator, represented in the scheme Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 135 SCC0234: Alternators with 12 terminals, with PMG, DER1 regulator, three-phase reference from 75V to 150V. The electric scheme is valid also in case of use of the DER2 regulator instead of the DER1 regulator, represented in the scheme Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 136 SCC0235: Alternators with 12 terminals, with PMG, DER1 regulator, three-phase reference from 150V to 300V. The electric scheme is valid also in case of use of the DER2 regulator instead of the DER1 regulator, represented in the scheme Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 137 Self-regulating Alternators Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 12.4 Electrical diagrams with UVR6 - SR7 regulators A2544: Alternators with 6 terminals, with SR7 analog regulator. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 138 Self-regulating Alternators Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 A2550: Alternators with 6 terminals, with UVR6 analog regulator. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 139 Self-regulating Alternators Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 A2545: Alternators with 12 terminals, with SR7 analog regulator. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 140 Self-regulating Alternators Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 A2549: Alternators with 12 terminals, with UVR6 analog regulator. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 141 Self-regulating Alternators Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 A2548: Alternators with 6 terminals, three-phase reference with UVR6 analog regulator. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 142 Self-regulating Alternators Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 A2552: Alternators with 12 terminals, three-phase reference with UVR6 analog regulator. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 143 Self-regulating Alternators Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 SCC0055: Alternators with 12 terminals (ZIG ZAG connection), with SR7 analog regulator. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 144 Self-regulating Alternators Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 SCC0054: Alternators with 12 terminals (ZIG ZAG connection), with UVR6 analog regulator. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 145: Spare Parts

    Self-regulating Alternators Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 13 Spare parts Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 146 Self-regulating Alternators Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 13.1 ECO 38C construction form MD35 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 147 12 Terminal block back panel 13 Terminal block back panel 14 Regulator plug with screwdriver 15 DSR Electronic Regulator 16 Cable gland rubber washer DG 21 17 EPDM rubber profile size 8.5x5.5mm Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 148 Self-regulating Alternators Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 13.2 ECO 38C Construction type B3B14 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 149 12 Terminal block back panel 13 Terminal block back panel 14 Regulator plug with screwdriver 15 DSR Electronic Regulator 16 Cable gland rubber washer DG 21 17 EPDM rubber profile size 8.5x5.5mm Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 150 Self-regulating Alternators Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 13.3 ECO 40C Construction type MD35 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 151 19 Front Cover MD35 - SAE 1 37 SAE 14 Discs 19 Front Cover MD35 - SAE 1/2 37 SAE 18 Discs 19 Front Cover MD35 - SAE 0.5 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 152 Self-regulating Alternators Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 13.4 ECO 40C Construction type B3B14 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 153 16 Stirrup support rear 17 Cable gland rubber washer 18 Frame with stator 19 Drive end bracket B14 21 Side protection screen B14 form 22 Upper/lower protection screen B14 form Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

  • Page 154: Decommissioning And Disposal

    The instructions contained in this chapter are recommendations to follow for environmentally sound disposal; the user has the responsibility of observing local regulations. For indicative percentages of the materials used in Mecc Alte alternators see paragraph 2.3.4. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not...
  • Page 155 Self-regulating Alternators Code: Series ECO-C ENGLISH Revision: 5 Data: 05/2025 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...

This manual is also suitable for:

Eco 40 seriesEco40-3sEco 43Eco 46

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