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Mecc Alte M K Series Technical Manual

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MxK DIGITAL
REGULATORS
TECHNICAL GUIDE

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Summary of Contents for Mecc Alte M K Series

  • Page 1 MxK DIGITAL REGULATORS TECHNICAL GUIDE...
  • Page 3 9.9 Power overvoltage protection ......................37 10 ALARMS MANAGEMENT ........................... 39 10.1 Active Alarms ..........................39 10.2 Alarm signalling by LED ........................40 10.3 Alarms description ......................... 40 10.4 Alarms log ............................44 10.5 APO output ............................. 45 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 4 ) ......57 12.9 SCC03038: Sensing single-phase from 55V to 150V ( ) ......58 12.10 S CC03039: Sensing single-phase from 150V to 405V ( ) ......59 12.11 S CC03042: Sensing three-phase from 150V to 405V - Serie Star ( ) ..60 12.12 S CC03043: Sensing single-phase from 150V to 405V - Serie Star ( ) ..61 13 CALIBRATION PROCEDURE ........................62 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 5 CAN Bus (wired) USB2MxK USB2MxK USB2MxK USB2MxK Embedded ModBus connection additional device (wireless) MxKonnect MxKonnect MxKonnect MxKonnect MxKonnect Active Protection Out (isolated) Tab. 2.1-I: MxK regulator hardware characteristics To maximise performance, MxK regulators should be considered as part of a system made up of at least two main components: the device (control unit) and a supervisor. The supervisor can be a personal computer/smartphone by Mecc Alte App, a group controller, or both; it does not control in real time, but can be used to set and see all the operation parameters of the regulator. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 6 ● ● Adjustable voltage droop on reactive current ● ● ● Overcurrent alarm on capability curve ● ● ● Excitation boost (up to 18Adc) ● ● ● CAN Bus J1939 communication protocol ● ● ● Configurable Active Protection Output (A.P.O.) ● High Dynamic Response ● Tab. 2.2-I: MxK regulator hardware characteristics Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 7 Revision: 3 Date: 25/06/24 2.3 Maximum Rating • Power winding protective fuse: 5A (fast blow) • Room temperature: -25°C to +70°C • Supply voltage: 50Vrms - 270Vrms (440V peak; from auxiliary, phase or PMG) • Maximum direct current output: 5Adc • Maximum peak current: 12Adc ( ) and 18Adc - excitation boost ( • Frequency operation interval: 20Hz - 90Hz • Voltage regulation field (sensing): 55Vrms - 405Vrms • Analogue input voltage for modifying the voltage setpoint -10V - +10V • Maximum current at C.T. secondary: 5Arms continuous (5.5Arms in transitory overload) 2.4 Overall Dimensions Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 8 Code: MxK Manual Regulators ENGLISH Revision: 3 Date: 25/06/24 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 9 Maximum length: 3m or 60·(1-P[64]) 50/60Hz Pext - C Setpoint modification Type: non-insulated Potentiometer: 10K potentiometer Maximum length: 30m Variation: -7% ÷ +7% Pext - W Type: non-insulated Zero_Ext Analogue input for Range: ±10Vdc modifying the voltage Variation: -14% ÷ +14% Burden: 0÷1mA (sink) Vext setpoint Maximum length: 30m NOTE (1): These terminals are connected on the board: 2 with 3, 4 with 5, 6 with 7, 8 with 9 NOTE (2): With external EMI filter (3m without EMI filter) Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 10 Pext - W Zero_Ext Type: non-insulated Analogue input for modi- Range: ±10Vdc Variation: -14% ÷ +14% fying the voltage setpoint Burden: 0÷1mA (sink) Vext Maximum length: 30m NOTE (2): With external EMI filter (3m without EMI filter) Tab. 2.5-IV - CN5 CONNECTOR Terminal Name Purpose Specifications Notes Zero Type: non-insulated UFLO: 50·(1-P[64]) Jumper input 50/60Hz Maximum length: 3m or 60·(1-P[64]) 50/60Hz Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 11 The regulators have an input for the voltage scale selection. The voltage scale is selected via the terminal connections • scale “H” for voltages from 55V to 150V • scale “F” for voltages from 150V to 405V The voltage scale selection depends on the connections with the machine and the voltage that needs regulation. The regulators have 3 differential inputs with 2 scales that can be selected by connecting to different terminals in each of them • scale “H” for voltages from 55V to 150V • scale “F” for voltages from 150V to 405V Use the three-phase, two-phase or single phase sensing from one of the two available scales according to the machine connections, the voltage to be regulated, and the voltages to be used for sensing. The regulator automatically identifies whether it is setup as a single phase or three phase by using a threshold level on its voltage sensing terminals. The sensing value is calculated as the arithmetic mean of the signals identified as being valid (1, 2 or 3). Bits B and B of the STATUS variable (address A[470]) indicate in real time the sensing sources considered for determining feedback (channel U, channel V, and channel W respectively). Single phase sensing can be implemented using 1, 2 or 3 channels connected in parallel or series, keeping the others short circuited to minimise the S/N ratio of the feedback. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 12 VEXT_RAM Digital External voltage Integer 2000 SETPS_VltgSetPt Setpoint modified by Vext Float VSE_VltgSetpt Setpoint modified by freq. Float OVC_VltgDrop Setpoint reduction by Feeding O.V. Float AMP_VltgDrop Setpoint reduction by AMP Float TVS_SnsgnVltgSetpt Setpoint effective Float MEC_SnsgnVltgRMS Sensing voltage (AVG value) Float PU_VltgRMS Ch. 1 sensing voltage (L-N) Float PV_VltgRMS Ch. 2 sensing voltage (L-N) Float Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 13 The setting of the VOLT trimmer, the external potentiometer, and the external analogue voltage (addresses A[402], A[410] and A[412] respectively) are instead expressed by an integer value in the range 0-4096 that is proportional to the trimmer or potentiometer position, or to the voltage value applied in relation to the range -10V/+10V (e.g. A[412]=2048 with an analogue voltage of 0V). 3.3 Setting of the setpoint The voltage setpoint has a fixed part (the nominal voltage), which is determined by the VOLT trimmer or the corre- USR_VltgSetpt sponding parameter P[45] (address A[90]), and a (possible) variable part, which is determined by the Pext (external Potentiometer) or Vext (external DC voltage +10/-10V ) analogue inputs - selection is automatic and considers one as an alternative to the other but with priority given to Pext - or by the corresponding value at VEXT_RAM address A[414] , which can be modified in almost real time using the provided communication interfaces. VEXT_RAM For both Vext and the corresponding value at address A[414] , the variation is established by the value VEXT_Gain set at parameter P[29] (address A[58]); the variation of Pext is limited to 50% of the variation of Vext. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 14 USR_VltgSetpt If the setpoint is varied (using the VOLT trimmer or the corresponding parameter P[45] , through VEXT_RAM the Vext or Pext input, or by modifying the value at the address A[414] ), the variation speed can be SETPT_MaxRate “slow”: in reply to a “fast” variation (up to the limit case of the step), Parameter P[60] (address A[120]) defines how fast the transition to the new setpoint will take place. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 15 The voltage DROOP acts in the same way, according to the reactive current (see DROOP chap.). Fig. 3.3-C shows the block diagram of the possible sources of setpoint modification, highlighting what the values that can be found at addresses A[416]-A[432] and A[456] refer to. Fig. 3.3-C: MxK Setpoint Tree Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 16 Setting the optimisation values according to the individual application can make it possible to obtain, at first star- ting, an increasing monotone progress of the voltage that is regulated by a settable time interval, with limited or no overshoot (dependent, however, also on a correct dynamic setting, see chap. 5 "SETTING DYNAMIC RESPONSE (STABILITY)"). As in the case of setpoint variation at the “working condition” where a “slow” variation is possible in answer to a “fast” variation (up to the limit case of the step, chap. 3.3 " Setting of the setpoint", fig. 3.3-B), even in the “start-up phase” it is possible to set the speed at which the effective setpoint transition is carried out, factually obtaining a START_Ma- “soft start”. In this case, the parameter that determines the setpoint increase speed in phase is P[62] xRate (address A[124]). START_InitSetpt Parameter P[61] (address A[122]) expresses the percentage value of the initial setpoint at first START_InitSetpt starting, e.g. the default value P[61] = 0.2 (20%) indicates that when the device is switched on, the setpoint will be set at 20% of the value indicated by the V/f curve and will then increase gradually according to START_MaxRate the value of parameter P[62] When the drive motor is started, the device generally starts at a speed that is lower than the threshold that defines the “start-up phase”; the setpoint is therefore reduced according to the speed itself on the basis of the current set- tings (see chap. 9.2 "Low speed protection"). If the voltage is already greater than the setpoint when the device is started, the setpoint and the voltage become aligned, so as to prevent self-excitation anomalies. Particularly critical is the time needed for complete control starting, however it cannot be null no matter how much care was taken with its optimisation. During first starting, this can cause irregular self-excitation, or relative overvoltage in relation to the setpoint, or absolute respect at nominal value. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 17 Tab. 5.1-I: Dynamic response parameters (stability and auto-tuning) NOTE : see Chapter 8 "CONFIGURATIONS" : P[36] = 6168 (AUTUNEonce=0, AUTUNEdone=0, AUTUNEfreeze=1) NOTE Weight Default Flag Name Flag Description Function value weight Trim3_En 0000 0008 TRIMMER STAB Enable Active JP_Autotuning_En 4096 0000 1000 Autotuning Switch Enable Active 4096 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 18 0000 8000 HDR active (Excitation voltage reverse)* 4194304 0040 0000 AUTO Autotuning Active 8388608 0080 0000 UPAR Use Autotuning Parameters STATUS Tab. 5.2-II: Dynamic response state flags, address A[470] * NOTE : HDR inactive regardless of the value of B , P[44] has no effect (HDR not present); : HDR active (B18 = 1) by default, P[44] see HDR chap. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 19 Fig. 5.3-B: P.I.D. Manual Settings The STAB trimmer position can always be read at address A[406]; with the trimmer enabled the position is mapped in the three P.I.D. settings (Kp, Ti and Td), which determine the dynamic response. With the trimmer disabled, the P.I.D. settings are defined by the three independent parameters P[37], P[38] and USR_KP USR_Ti USR_Td P[39] ( ) stored in E2PROM and which can be modified by the user at addresses A[74], A[76], A[78]). The source of this setting (trimmer position or parameters) depends on the state of the Trim3_En flag (bit B3 of pa- CONFIGURATION_1 rameter P[35] , address A[70]). fig. 5.3-C: Dynamic response settings selection. Fig. 5.3-C: Dynamic response settings selection Setting the dynamic response becomes easier using the Mecc Alte App which, from the Settings>Base>Stability, can be used to modify the indicated parameters and flags through a graphic interface. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 20 The dynamic settings calculated by the auto-tuning algorithm can be read at addresses A[480] Ki_ATUNE_tmp Kd_ATUNE_tmp A[482] and A[484] fig. 5.5-A: Auto-tuning P.I.D. controller settings. Fig. 5.4-A: Auto-tuning Selection scheme Kp_ATUNE Ki_ATUNE At starting, auto-tuning algorithm activation and the initial dynamic settings values ( ATUNE ATUNEonce ATUNEdone CONFIGURATION_2 ) depend on how bits B1 and B2 ( of parameter P[36] (ad- dress A[72]) are set. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 21 ATUNEonce If the B bit of parameter P[36] (address A[72]) is set at 1 ( = 1), stopping dynamic settings updating (Freeze auto-tuning) also, in addition to what has already been described, results in Kp_ATUNE Ki_ATU- • the previously mentioned settings being saved in the respective parameters P[96] , P[97] Kd_ATUNE , P[98] (addresses A[192] , A[194] and A[196]) fig. 5.5-A: Auto-tuning P.I.D. controller settings. CONFIGURATION_2 ATUNEdone • the SET at 1 of bit B of parameter P[36] (address A[72]) ( Fig. 5.5-A: Auto-tuning P.I.D. controller settings Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 22 Fig. 6-A: Andamenti di Vo(t) e Vexc(t) di M3KS-HD e di un regolatore senza inversione di Vexc HDR_Preset Parameter P[44] sets the initial excitation percentage after the intervention of the HDR (which, because of its nature, intervened when the excitation had already been reduced to zero) and further optimises HDR_Preset the recover time with HDR enabled. The P[44] = 0.5 default value is 50%; from this point onwards it is the voltage regulator that sets the necessary excitation value. CONFIGURATION_1 Bit B18 of parameter P[35] disables the HDR, the HDR is enabled by default (B = 1), to disable set B = 0. The benefits that can be obtained from the High Dynamic Response also depends on an accurate regulator dynamic response setting. If the response is too slow, the control system may not re- quest excitation voltage inversion; in this case the module would not operate and the response would be the same as that of a conventional regulator. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 23 Setpt PU_AppPwr Apparent power (unsigned Float [VA] (13) PU_ActPwr Active Power (signed Float (13) LAE_CosPhi Cosφ (calculated) Float (14) PU_ReactPwr Reactive Power (signed Float [VAR] (13) Tab. 7.1-III: Droop, currents, powers and cosφ operative variables Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 24 CURR_CANSclng Parameter P[25] acts as a scale factor in relation to the nominal current: CURR_CANSclng P[25] = 5A / I CT_RATIO Generator_Phase_A_U_AC_RMS_ and is used together with P[55] to determine the value in A[534] Current (effective value) to be transmitted on CAN: CT_RATIO CT_RATIO ASC_PUcurrRMS CURR_CANSclng A[534] = P[55] [A] = P[55] * A[448] / P[25] Setting becomes much easier using the Mecc Alte App, which makes the calculations starting from the nominal data of the alternator and the C.T. through the menu. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 25 COS_PHI_TH fault P[79] = 0,02 causes all the values between 0.98 capacitive and 0.98 reactive to be estimated as cosφ=1 I_MIN_TH • P[80] (in p.u. at 5A) sets a threshold below which the current is assumed as null; as a result even the I_MIN_TH power components are assumed null (in this case cosφ is represented as unity). By default, P[80] 0,05 causes the current at the C.T. secondary to be estimated as not null (I2[A] ≠ 0) for values above 1% of its nominal value (0.05A for 5A nominal). 7.4 Voltage droop as a function of the reactive current In case of parallel operation between generators or with the grid, it is possible to activate a voltage droop proportio- nal to the reactive component of the output current only operational with a C.T. traditional additional devices (PD + PID) are no more needed. If equipped with a C.T., the regulator measures the current phase lead or lag in relation to the voltage; if the in quadrature component of the current lags behind the voltage, it determines a reduction of the setpoint as a function of its amplitude, while if leading it determines an increase of the setpoint as a function of its amplitude and the contextual signalling of a “Capacitive Load” alarm. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 26 7.5 Phase overcurrent on the basis of the capability curve regulators have an A11 alarm for stator overcurrent in relation to the nominal value set by parameter P[54] M3Kx OVERCURRENT PUC_ADCSclng (default 5 [P.U.]) and in any case conditioned by parameter P[23] as described in chap. 7.2 “Current measuring and expression”; the alarm, that is only operational when a C.T. is used,, does not interfere with the control and refers to a current value function of cosφ, not a simple fixed value. In detail, having defined the current limit point areas, hereinafter “current limit”, substantially based on the generic capability curve (P-Q curve shown in fig. 7.5-A by a dashed line) at the nominal voltage: a. For inductive loads where 0.8 < cosφ < 1, the current limit matches with its rated value (in the P-Q diagram the position of the limit points is an arc of a circle with centre 0.0 and radius IR b. For inductive loads where PF<0.8, the current limit reduces progressively as a function of the PF by up to 80% of the nominal current when PF=0 Leading_ c. In the case of capacitive loads, the current limit depends also on the additional parameter P[124] Current_Limit (address A[248]), expressed in percentage values (from 0 to 1): Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 27 (0;5) (0,6;0,8) (3,0;4,0) 0.6PF 0.6PF Loading current Limit: P[T.B.D.] 0.4PF 0.4PF 0.2PF 0.2PF (4,0;0) (0,8;1) (-0,20;0) [p.u.] -1,2 -0,8 -0,6 -0,4 -0,2 Fig. 7.5-A: Current limit point area Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 28 Disabled Disabled 2417512638 Enabled Disabled Disabled Disabled 270032062 Disabled Disabled Enabled Enabled 2417515710 Enabled Disabled Enabled Enabled 2417777854 Enabled Enabled Enabled Enabled CONFIGURATION_1 Tab. 8-I: Table device dependent Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 29 OUTLINE OF THE SPEED OPERATIVE VARIABLES Add. Description Access Parameter Type Max. Min. Unit VSE_VltgSetpt Setpoint modified by frequency Float AF2P_Freq Frequency Float STATUS Active Status Integer ALARMS Active Alarms Integer Tab. 9.1-III: Speed operative variables Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 30 Setpoint) Parameter c is related to the intervention threshold of the frequency voltage linear relationship, parameter K is the slope. Both settings are only possible using suitable parameters ( regulators do not have an Hz trimmer). VF_FreqDrop According to the value of parameter P[64] , as outlined in Tab. 9.2-I, the threshold is: • 50·(1-P[64]) [Hz] if the nominal frequency is 50Hz (A[470] Bit B • 60·(1-P[64]) [Hz] if the nominal frequency is 60Hz (A[470] Bit B With frequencies lower than the established threshold, the setpoint, and in consequence the regulated voltage, is reduced proportionally to the speed (figs. 9.2-A, 9.2-B and 9.2-C). Having defined the “start-up phase” as the functional condition beginning from alternator starting to the previously mentioned threshold, exceeding for the first time that threshold is the condition that causes the change to the fun- ctional condition defined as “working phase”. The slope of the V/f separately settable for the two phases: at the “start-up phase” it depends on the value of pa- START_SLOPE rameter P[65] (address A[130]), at the “working phase” it depends on the value of parameter P[66] VF_VFDrop (address A[132]); Both parameters have the same range and the same effect: an increase in the value causes the slope to increase (greater voltage reduction as a function of the frequency reduction), a value decrease causes the slope to decrease to the limit case of the null value that causes null slope (no voltage reduction). The slope is expressed by parameters P[65] and P[66] in terms of ΔV%/Δf%, so that each value corresponds with the same slope at both nominal frequencies (50Hz or 60Hz). The default and limit values are given in Tab 9.2-I. Some examples appear in figure 9.2-A, 9.2-B and 9.2-C Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 31 Tab. 9.2-I: Values for setting the voltage-frequency relationship Fig.: 9.2-A: V/f connection with P[64]=0.1 and P[66]=1,1010 Fig.: 9.2-B: V/f connection with P[64]=0,1 and P[66]=3,9957 Threshold=90% Slope=5,128V/Hz Threshold=90% Slope=18,46V/Hz Fig.: 9.2-C: Default V/f connection P[64]=0,04 and P[66]=1,0379 (Threshold=96%fN, Slope=4,79V/Hz) Activating of the operative condition with voltage proportional to the frequency is signalled by activation of alarm 13 (A[472] ALARMS Bit B13=1), visible also by the LEDS (see ALARMS chapter). These calibrations become much easier with the Mecc Alte App which, from the Settings>Base>V/F Slope menu, can be used to modify the parameters and give a preview of the V/f relationship when setting by means of a graphic interface. Overheating that can damage machine integrity can occur when the voltage is lowered too much at low frequency and the alternator has to operate at those points. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 32 (P[35] TION_1 CONFIGURATION_1 Bit B ); source selection depends on the status of the configuration flag (P[35] Bit ). The default settings are: CONFIGURATION_1 • Enabling/disabling L.A.M.S. by DIP switch [L]: (P[35] Bit B LAM_En CONFIGURATION_1 • flag ( ) configured for LAM not active: (P[35] Bit B If activated, the L.A.M.S. only becomes operative during the "working phase" and is not active during the "start-up phase", where the V/f start-up relationship remains (see definitions in 9.2 "Low speed protection") Fig. 9.3-A: L.A.M.S. (Load Acceptance Module System) Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 33 Parameter Type Default Max. Min. Unit USR_ExcttnTempSetPt Over Excitation Threshold Float Over exc. regulator integral time const. AMPCTRL_PITi Float AMPCTRL_PIKP Over exc. regulator proportional gain Float 0.75 U_EXC_THRESHOLD Under Excitation Threshold Float Float Tab. 9.4-I: Parameters related to overexcitation and underexcitation Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 34 The excitation limit setting (over excitation threshold) is determined by the AMP trimmer or the corresponding USR_ExcttnTempSetPt parameter P[48] ; the source of this setting (trimmer or parameter) is selected by the con- Trim4_En CONFIGURATION_1 figuration flag (P[35] Bit B ), fig. 9.4-B An estimate of the “accumulated energy” is available in almost real time (and is available) at address A[492] gExcVltgFiltered Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 35 The status, signalled by the activation of alarm 08 (A[472] Bit B =1), also visible with the LEDs (see ALARMS chap.) is maintained for all the time that the setpoint is reduced because the protective device has activated (i.e. when the regulator-limiter activates); in this way at least one reason why the regulated voltage is lower than the set value is signalled. protection adjust becomes easier with the Mecc Alte App software which, on the main Dashboard gives a graphic avgExcVltgFiltered representation of the “accumulated energy” (address A[492] ) and the protection threshold EXC_RefDsrdVltg USR_ExcttnTempSetPt (address A[492] set by the AMP trimmer or Parameter P[48] 9.7 Under excitation The regulator is equipped with an under excitation protection which depends on the rms value of the excitation rmsExcVltg U_EXC_THRE- voltage available at address A[494] : if lower than the threshold set by parameter P[53] SHOLD the A10 (A[472] ALARMS Bit B =1) alarm activates, also visible with the LEDs (see chap. 10 "ALARMS MANA- GEMENT"), without affecting the control. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 36 LOSW Phase W sensed (Loss of sensing phase W if 0) Tab. 9.8-IV: Sensing status flags, address A[470] STATUS The synchronous alternators were designed to supply a current that is well above the nominal value when in short circuit. They cannot, however, sustain this irregular operating condition for an unspecified time, therefore the regu- lator has a dedicated protective device. When set correctly, the regulator protective device is limited to the alternator, so it should not be considered as enough protection for the system. It is considered that the user has implemented appropriate and suitable system protection within the stopping intervention time determined by the protective devices. Having identified the three-phase short circuit condition at the main stator, the excitation voltage is set by the regu- lator at maximum so as to guarantee maximum current; after a time that is settable, the regulator drops the excita- tion voltage completely and irreversibly (until reset). If the short circuit conditions stop within a period of time that is less than the one set, the device begins regulating the voltage as normal. SCC_VldtnTime Identifying the short circuit condition requires a minimum time defined by parameter P[56] ; in most cases a time of between 0.5s. and 1s. should be enough to reliably identify the condition. Setting an excessively short time may not make it possible to recognise the short circuit. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 37 Tab. 9.9-II: Power overvoltage protection variables regulators have a power voltage limiter to prevent the peak levels from the auxiliary winding source when at load which may contain high harmonic levels caused by the effects of the load applied on the main stator windings. The protective device not only signals that the regulator operation limit has been exceeded, but also has an active function to eliminate the cause: if the peak voltage value is near the maximum, the excitation value is reduced throu- gh setpoint reduction, and also the power voltage, if obtained from a winding coupled with the main magnetic flow (consequently also the outgoing voltage to a value lower than the one that is set). Fig. 3.3-C: MxK Voltage Setpoint. The protective device intervention value cannot be modified because it is linked to the hardware's maximum ratings. AUX_OV_KP The dynamics of the power supply regulator-limiter can be modified by parameters P[77] and P[76] AUX_OVC_Ti ; the default values should be suitable for most cases, with only particular cases (e.g. elevated alterna- tor magnetic gain values) requiring the possible necessity to modify the values. ALARMS The status, signalled by activation of alarm 11 (A[472] Bit B =1), also visible via the LEDs (see chapter 10 "ALARMS MANAGEMENT") is maintained throughout the time of the setpoint reduction because the protective de- vice has enabled (i.e. when the regulator-limiter is active), in this way at least one reason why the regulated voltage is lower than the set value is signalled. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 38 Code: MxK Manual Regulators ENGLISH Revision: 3 Date: 25/06/24 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 39 33554432 0200 0000 Reserved ERRVM 67108864 0400 0000 Negative Power 134217728 0800 0000 Reserved 268435456 1000 0000 Reserved FPSW 536870912 2000 0000 Reserved 1073741824 4000 0000 Free for future use 2147483648 8000 0000 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 40 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 LThe alarm, inhibited during the transients and identified as being above the intervention threshold of the low starting speed alarm, only activates if the excitation has already been increased to maximum and, as such, the Description outgoing voltage control has been lost. The threshold, which cannot be modified, is set at 5% below the setpoint value. δ[%] f[Hz] LED* δ[%] f[Hz] [°] φ Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 41 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 The alarm not only signals if the regulator operating limit has been exceeded, but is also active in eliminating the cause. A regulating loop takes control of the voltage after a threshold has been exceeded, causing the excitation current to lower (therefore also the regulated voltage). Description The alarm status is present for the whole time during which the outgoing voltage is reduced because of protecti- ve device intervention. The intervention threshold cannot be modified. Detailed description of the actions in the chapter 9 "PROTECTION". δ[%] f[Hz] LED* δ[%] f[Hz] [°] φ Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 42 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Description The alarm does not affect the control. The threshold, which cannot be modified, is 85°C. The setting of Bit B17 signalling limit temperature (Alarm 17) is also maintained (se θAVR>85°C it is just as true that θAVR>70°C) δ[%] f[Hz] LED* δ[%] f[Hz] [°] φ Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 43 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 The alarm, operative only with with C.T., does not affect the control and depends on the power sign, M3Kx Description determined through calculation of the active and reactive components of the electrical sizes. δ[%] f[Hz] LED* δ[%] f[Hz] [°] φ NOTE * Considering a period TLED=2sec for LED flashing, the following are reported: • The duty cycle [%] of the green LED: δDL1 • The frequency [Hz] of a possible modulating frequency for the green LED: fDL1 • The duty cycle [%] of the red LED: δDL2 • The frequency [Hz] of a possible modulating frequency for the red LED: fDL2 • The phase ratio φ [°] between the red and green LEDs (where 0° indicates that the 2 LEDs Are lit simultaneously and 180° indicates that for each cycle the LEDs can only lit in different semi-periods) Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 44 AlarmLogStatistics0NN • A[1058] = System OK event accumulator, not represented by the B0 bit of A[472] (not used, see §1 Active Alarms and §3 Alarms description, System OK) AlarmLogStatistics0TT • A[1060] = System OK time accumulator For each of the 31 alarms A[k] with k=1÷31 The AlarmLogStatisticskNN event accumulator is allocated to A[1058 + 4*k] The AlarmLogStatisticskTT total time accumulator is allocated to A[1058 + 4*k +2] AlarmLogStatistics1NN A[1062] = Event accumulator A[1] (Check-sum EEPROM) AlarmLogStatistics1TT A[1064] = Time accumulator A[1] (Check-sum EEPROM) and so on until AlarmLogStatistics31NN A[1182] = Event accumulator A[31] (Free for future use) AlarmLogStatistics31TT A[1184] = Time accumulator A[31] (Free for future use) Alarm LOG data access and interpretation become easier with the Mecc Alte App or one of the MeccAlte GC control- lers connected to the regulator by CANBus. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 45 APO_DELAY - how parameter P[117] CONFIGURATION_1 - how the "APO Inversion" flag, Bit B of P[35] is set The output is closed during normal operation. It opens (with a programmable delay) when one or more of the APO_SELECT alarms that can be selected separately with P[116] are active, and the "APO invert" flag is enabled APO_DELAY (P[35] Bit B14=1), and the time set by P[117] , or it opens immediately if the regulator is not being powered. If the "APO invert" flag is disabled (P[35] Bit B =0) the APO output is inverted (opened during normal operation or when the regulator is off, closed, with a programmable delay, in the event of one or more active APO_SELECT alarms that were selected using P[116] APO_ The selection of which alarms cause the A.P.O. to activate depends on the value written at location P[116] SELECT . The output becomes inactive when no alarm is active and when the corresponding enabling bit is set to 0, even if there is an active alarm. APO_DELAY The intervention delay in seconds can be set using the value of parameter P[117] APO output management becomes easier using Mecc Alte App which, from the Settings>Advanced>Config part 1>APO Inversion, can be used to modify the parameters values and flags. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 46 Fig. 11.1-A: COM connector (ModBus) on Fig. 11.1-B: COM connector (ModBus) on Connection can be wired or wireless: in the first case (to a PC) it is via the USB port mounted on the board and only a suitable cable is needed, in the second case (PC or Smartphone) the additional device MxKonnect is needed USB cable (male type A - male type A) or Kit consisting of MxKonnect and related connection cables are available upon request. Fig. 11.1-C: COM connector (ModBus) on Fig. 11.1-D: COM connector (ModBus) on Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 47 Unwired CAN_L Signal CAN-L GND_CAN Unwired Unwired Unwired CAN_H Signal CAN-H Unwired CAN_V+ Supply 12÷24Vdc tab. 11.2-I: CAN connector pinout For operation of the part isolated from the driver controller, it is necessary to supply the CAN module with a voltage, isolated, between 12VDC and 24VDC, (fig. 11.2-II) fig. 11.2-A: Functional diagram of the CANBus connection Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 48 ● ● ● 1700050 BROADCAST WRITE PARAMETER PROPRIETARY ● ● ● tab. 11.2-III: Outline of the published messages With a proper field format (compliant with SAE J1939) Meccalte specific parameter groups are supported even if they do not appear in the indicated standard. All parameters can be read and written. The specific protocol is encapsulated inside the CAN frame in accordance to the standard and specific content of the recommended usage procedures appearing in the standard. The definitions of the proprietary messages, divided into functional groups, are: • Proprietary Broadcast: PGN65281, PGN65283, PGN65287, PGN65312 • Proprietary Destination Specific Messages: PGN61184 • Proprietary Commands and Requests: PGN1639378, PGN1642706, PGN1700050 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 49 M2K M2K single phase sensing from 150V to 405V (series star/delta) SCC03030 M3K M3K three phase sensing from 55V to 150V SCC03036 M3K M3K three phase sensing from 150V to 405V SCC03037 M3K M3K single phase sensing from 55V to 150V SCC03038 M3K M3K single phase sensing from 150V to 405V SCC03039 M3K M3K three phase sensing from 150V to 405V (series star) SCC03042 M3K M3K single phase sensing from 150V to 405V (series star) SCC03043 Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 50 Code: MxK Manual Regulators ENGLISH Revision: 3 Date: 25/06/24 12.1 SCC03022: Sensing from 150V ( Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 51 Code: MxK Manual Regulators ENGLISH Revision: 3 Date: 25/06/24 12.2 SCC03024: Sensing from 55V to 150V ( Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 52 Code: MxK Manual Regulators ENGLISH Revision: 3 Date: 25/06/24 12.3 SCC03028: Sensing from 150V ( Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 53 Code: MxK Manual Regulators ENGLISH Revision: 3 Date: 25/06/24 12.4 SCC03029: Sensing from 55V to 150V ( Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 54 Code: MxK Manual Regulators ENGLISH Revision: 3 Date: 25/06/24 12.5 SCC03030: Sensing from 150V to 405V - Serie Star/Delta ( Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 55 Code: MxK Manual Regulators ENGLISH Revision: 3 Date: 25/06/24 12.6 SCC03031: Sensing from 150V to 405V ( Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 56 Code: MxK Manual Regulators ENGLISH Revision: 3 Date: 25/06/24 12.7 SCC03036: Sensing three-phase from 55V to 150V ( Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 57 Code: MxK Manual Regulators ENGLISH Revision: 3 Date: 25/06/24 12.8 SCC03037: Sensing three-phase from 150V to 405V ( Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 58 Code: MxK Manual Regulators ENGLISH Revision: 3 Date: 25/06/24 12.9 SCC03038: Sensing single-phase from 55V to 150V ( Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 59 Code: MxK Manual Regulators ENGLISH Revision: 3 Date: 25/06/24 12.10 SCC03039: Sensing single-phase from 150V to 405V ( Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 60 Code: MxK Manual Regulators ENGLISH Revision: 3 Date: 25/06/24 12.11 SCC03042: Sensing three-phase from 150V to 405V - Serie Star ( Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 61 Code: MxK Manual Regulators ENGLISH Revision: 3 Date: 25/06/24 12.12 SCC03043: Sensing single-phase from 150V to 405V - Serie Star ( Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 62 13.5 Set up the STAB trimmer (STAB): • With the alternator running idle at rated speed, with a lamp or analog voltmeter connected to the machine output terminals, as follows: • if with the setting made in 13.1 you notice an oscillation in the brightness of the lamp or the indication of the voltmeter, rotate the STAB trimmer anti-clockwise until the brightness or the indication are perfectly stable. • if by rotating the STAB trimmer anti-clockwise no changes are detected or the instability tends to increase, bring the STAB trimmer back as indicated in 13.1 and then rotate it clockwise until the brightness or the volt- meter indication are perfectly stable. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 63 13.9 Disengage the load and stop the machine. 13.10 Repeat starting the machine: • Start the alternator up to the nominal speed and check its self-excitation, the voltage must be the nominal Vn ±1% (e.g. Vn=400V V-LL=396÷404V, e.g. Vn=480V V-LL=475 ÷485V). • NOTE: The MxK regulators are not equipped with the Hz trimmer for setting the intervention threshold of the low speed protection which by default is set at -4% of the nominal frequency (48Hz for fn=50Hz and 57.6Hz for fn=60Hz ); the modification can only be made via software setting (§9.2). 13.11 Stop the alternator and seal the regulator's “AMP” trimmers with white silicone. Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 64 Code: MxK Manual Regulators ENGLISH Revision: 3 Date: 25/06/24 REVISION Revision Date Description 04/23 Initial Release 05/23 Minor update 10/23 Text corrections, autotuning table modified, electrical scheme table and minor updates 06/24 Added calibration procedure Mecc Alte S.p.A. - Full or partial reproduction prohibited, if not authorized...
  • Page 66 UNITED KINGDOM SPAIN CHINA INDIA Mecc Alte U.K. LTD Mecc Alte España S.A. Mecc Alte Alternator Haimen LTD Mecc Alte India PVT LTD 6 Lands’ End Way C/ Rio Taibilla, 2 755 Nanhai East Rd Plot NO: 1, Sanaswadi Oakham Polig.

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