MXB-E

ModelMXB-E
PowerUp to 375 kVA
VoltagesUp to 480 V
Frame160 ÷ 250
Poles4
CoolingIC01 as per IEC 60034-6
IPIP 23 as per IEC60034-5 
(up to IP 44 from 180 to 250 frame size)
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
  • Regulation
  • Optional features

Certificates and testing

Applicable standards
Applicable standards
Generators are designed in compliance with:
IEC 60034 - 1
BS 4999 - 5000
NEMA MG 1.32
Generators conform to EU rules
UL 1004 - 1 (Certification pending)
UL 1004 - 4 (Certification pending)
C22.2 No. 100 (Certification pending)
Certificate
Certificate
Test Certificate supplied with the machine

Material certificates in accordance with EN 10204 : 2001 can be supplied on request

Main components

Housing
Housing
Fabricated steel
Shield
Shield
N-End Endshield:
Aluminium alloy (from 160 to 225 frame size)
Cast iron (250 frame size)  

Shaft
Shaft
Carbon steel - hot rolled
Terminal board
Terminal board
Main terminal box
Made of Bakelite  7-pins (from 160 to 180 frame size); 9-pins (from 225 to 250 frame size)
Fan
Fan
 Plastic up to MXB-E 180 SC4 included - Aluminum alloy above

Construction

Enclosure
Enclosure
ODP - Open Drip Proof
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 - double bearing available on request from 180 to 250 frame size

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
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
Typically THD < 2% at no load / 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

Regulation

AVR model
AVR model
AVR code : 11000013 - M00FA122A 
AVR Model : MARK VX
Dedicated AVR for optional PMG
AVR position
AVR position
160 - 180 frame size: on left side viewed from D-End
225 - 250 frame size:  front mounted
AVR supply
AVR supply
Mains. PMG or Auxiliary winding on request
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
MXB-E series
-160180225250
Operating conditions-
Special voltageoooo
Provision for parallel operation with similar generators with AVR (MEC 20)n/ao*oo
Terminal box-
IP55 terminal boxoooo(1)
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
Protection degree-
Inlet filtern/aooo
Inlet + outlet filter (IP43)n/aooo
Inlet + outlet filter (IP44)n/aooo
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-
Special painting cycle (MM ref. F96831)oooo
Painting colour different from RAL 9005 and RAL 5010oooo
Painting colour RAL 9005 Black or RAL 5010 Blue (standard alternator not painted)oooo
Special painting cycle (MM ref. F96819)oooo
Special painting cycle (MM ref. F96826)oooo
Environmental solutions-
Tropicalization (CW1081)oooo
Excitation system-
Auxiliary windingoooo
PMG with single-phase AVR (Mark XX) side mountedooon/a
PMG with single-phase AVR (Mark XX) front mountedn/ao*on/a
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 housing (2)n/aooo
NDE grease nipplen/an/an/ao
DE grease nipplen/an/an/ao
Other accessories-
N. 3 CT single core on neutral point (low voltage)n/an/an/ao
(*) this option includes also large terminal box
(1) On H class overtemperature a 10% derating must be applied
(2) Based on volumes

-o: optional | n/a: not available | s: standard

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