MXB

ModelMXB
PowerUp to 375 kVA
VoltagesUp to 480 V
Frame160 ÷ 250
Poles4
CoolingIC01 as per IEC 60034-6
IPIP23 as per IEC 60034-5 (up to IP 44)
EnclosureODP - Open Drip Proof
Main ApplicationsData center, Emergency, Portable, PRP and COP, Stand-by, UPS
SectorPower generation
  • Certificates and testing
  • Main components
  • Construction
  • Technical data
  • Operating conditions
  • Auxiliary device
  • Optional features

Certificates and testing

Applicable standards
Applicable standards
Generators are designed in compliance with:
IEC 60034 - 1
CEI 2-3
BS 4999 - 5000
VDE 0530
NF 51 - 100
NF 51 - 111
OVE M - 10
NEMA MG 1.32
Generators conform to EU rules
UL 1004 - 1
UL 1004 - 4
C22.2 No. 100
Certificate
Certificate
Test Certificate supplied with the machine
Material certificates in accordance with EN 10204 : 2001 can be supplied

Main components

Housing
Housing
Rigid frame, rugged welded steel fabrication (EN 10025 - S235 JR)
Frame is provided with side ribs to increase the strength
Marelli Generators for continuous duty operation are designed to meet vibration levels per IEC 60034-14, ISO 10816-1 and BS 5000-3
Shield NDE
Shield NDE
Aluminium alloy 46100S T6 (from 160 to 225 frame size)
Cast iron GJL 300 (250 frame size)
Shaft
Shaft
Carbon steel - hot rolled (EN 10025 - S355 JR)
Terminal board
Terminal board
Made of Bakelite PF2736 7-pins (from 160 to 180 frame size) 9-pins (from 225 to 250 frame size)
Fan
Fan
PA 6.6 up to MXB 180 SC4 included - Aluminum alloy above

Construction

Cooling System
Cooling System
IC01 as per IEC 60034-6
Degree of protection
Degree of protection
IP 23 as per IEC60034-5 (up to IP 44 from 180 to 250 frame size)
Mounting
Mounting
Horizontal single bearing (160 frame size)
Horizontal single bearing - IM 2105 from 180 to 250 frame size (double bearing available on request)

Technical data

Stator/Rotor core
Stator/Rotor core
Laminated and enamel-insulated on both sides to minimise eddy-current losses
Rotor
Rotor
Salient pole type
Made by copper wire
H class insulated with enamel coating
Winding retaining by pass-through bars of high quality steel
Rotating rectifier: Graetz diode bridge with 6 diodes
Rotors are dynamically balanced
Bearing
Bearing
General data
Single or double antifriction bearing grease lubricated (ball type)
Bearing lifetime >=20'000 hours
Bearing selection
Antifriction bearings
Impregnation system
Impregnation system
Epoxy resin through high quality process
Insulation system
Insulation system
Class H for stator and rotor
Protective treatments
Protective treatments
Standard impregnation with epoxy resin through high quality process
CW1081 on request

Operating conditions

Overloads
Overloads
During continuous duty (S1), the following overloads are allowed:
10% for 1 hour
15% for 10 minutes
30% for 4 minutes
50% for 2 minutes
These overloads must be occasional and followed by one hour of running at normal load or less
Parallel operations
Parallel operations
All generators are provided with an amply sized damper cage and are suitable for parallel operations with other generators, when equipped with the paralleling unit (available on 180, 225 and 250 frame size)
Transient ratings
Transient ratings
All generators can be designed to meet specific reactance values (x'd and x''d). Values can be confirmed by contacting Marelli Motori
Three pahse short circuit current
Three pahse short circuit current
Generators with auxiliary windings or PMG ensure a three phase short-circuit current (Icc) higher than 3 times the rated current (in): Icc > 3 In for 10 seconds
Radio interference
Radio interference
All generators are equipped with Class B Group 1 radio interference filters as defined by EN 55011
THD (Total Harmonic Distortion) / THF
THD (Total Harmonic Distortion) / THF
The no-load voltage wave form is sinusoidal with THD content less than 2% / THF < 2%
Vibrations
Vibrations
Vibration level is in accordance with ISO 10816. Measurement, evaluation and limits of vibration severity are in accordance with IEC 60034-14

Auxiliary device

AVR model
AVR model
AVR model 11000013 - MARK VX
Dedicated AVR for optional PMG
AVR position
AVR position
On right side viewed from D-End
225 - 250 frame size front mounted
AVR supply
AVR supply
Auxiliary winding
Voltage sensing
Voltage sensing
Single phase
Accuracy
Accuracy
± 0,5% (@rated load, balanced and not deforming, P.F. 0,8)
EMI filter
EMI filter
Included
Limiters
Limiters
U/F Under Frequency

Optional features

Options available
Options available
-160180225250
Operating conditions-
Special voltage including 380V, R3, R6 (LV only)oooo
Provision for parallel operation with similar generators with AVRn/ao*oo
Terminal box-
IP55 terminal boxoooo
Large terminal boxn/aon/an/a
Separate auxiliary terminal boxn/aooo
Non-magnetic exit cable paneln/an/an/ao
6-leads windingn/an/an/ao
Heating-
Anti-condensation heaters (V=220 V)oooo
Temperature sensors-
N. 3 PTC thermistorsoooo
N. 3 PT100 resistance temperature detectors in stator windingn/aooo
N. 1 PT100 on N-End bearingoooo
N. 1 PT100 on D-End bearing (for double bearing configuration)n/aooo
N. 1 PT100 duplex type on N-End bearingn/aooo
N. 1 PT100 duplex type on D-End bearing (for double bearing configuration)n/aooo
N. 1 PT100 air inletn/an/an/ao
N. 1 PT100 air outletn/an/an/ao
Protection degree-
Inlet filtern/aooo
Inlet + outlet filter (IP43)n/aooo
Inlet + outlet filter (IP44)n/aooo
Air to fresh water heat exchanger top mounted on generator (IP44)n/an/an/ao
Air to salt water heat exchanger top mounted on generator (IP44)n/an/an/ao
Air to air heat exchanger top mounted on generatorn/an/an/ao
AVR-
Single-phase sensing AVR (Mark VX), side mountedssoo
Single-phase sensing AVR (Mark VX), front mountedn/ao*ss
Three-phase sensing AVR (MEC-20), side mountedn/ao*oo
Three-phase sensing AVR (MEC-20), front mountedn/ao*n/ao
Digital AVR D-Vo (mounted on board)n/an/an/ao
Automatic power factor regulator (mounted on board)n/an/an/ao
Painting-
Non standard colour (MM ref. F96831)oooo
Special painting cycle (MM ref. F96819)oooo
Special painting cycle (MM ref. F96826)oooo
Environmental solutions-
Tropicalization (CW1081)oooo
Excitation system-
PMG with single-phase AVR (Mark XX) side mountedoooo
PMG with single-phase AVR (Mark XX) front mountedn/ao*oo
PMG with three-phase AVR (MEC-20) side mountedn/ao*oo
PMG with three-phase AVR (MEC-20) front mountedn/ao*n/ao
PMG with digital AVR D-Vo (mounted on board)n/an/an/ao
Mechanical configuration-
Special shaft extensionn/an/an/ao
Second shaft extension (as per catalogue)n/an/an/ao
Special housingn/an/an/ao
Neutral point terminal box for B2-B3-B34 constructionn/an/an/ao
NDE grease nipplen/an/an/ao
DE grease nipplen/an/an/ao
Other accessories-
Toothed wheel (n.60 teeth) with provision for speed sensor (sensor not included)n/an/an/ao
64R - Brush connection with rotor for earth fault detection (without protection device)n/an/an/ao
N. 3 CT single core on neutral point (low voltage)n/an/an/ao
(*) this option includes also large terminal box
-o: optional | n/a: not available | s: standard

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