United Kingdom / English
MXB-E
Model MXB-E
Power Up to 375 kVA
Voltages Up to 480 V
Frame 160 ÷ 250
Poles 4
Cooling IC01 as per IEC 60034-6
IP IP 23 as per IEC60034-5 (up to IP 44 from 180 to 250 frame size)
Enclosure ODP - Open Drip Proof
Main Applications Data center, Emergency, Portable, PRP and COP, Stand-by, UPS
Sector Power generation
Certificates and testing
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
Test Certificate supplied with the machine
Material certificates in accordance with EN 10204 : 2001 can be supplied on request
Main components
Housing
Fabricated steel
Shield
N-End Endshield:
Aluminium alloy (from 160 to 225 frame size)
Cast iron (250 frame size)
Shaft
Carbon steel - hot rolled
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
Plastic up to MXB-E 180 SC4 included - Aluminum alloy above
Construction
Enclosure
ODP - Open Drip Proof
Cooling System
IC01 as per IEC 60034-6
Degree of protection
IP 23 as per IEC60034-5 (up to IP 44 from 180 to 250 frame size)
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
Laminated and enamel-insulated on both sides to minimise eddy-current losses
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
General data
Single or double antifriction bearing grease lubricated (ball type)
Bearing lifetime >=20'000 hours
Impregnation system
Epoxy resin through high quality process
Insulation system
Class H for stator and rotor
Protective treatments
Standard impregnation with epoxy resin through high quality process
CW1081 on request
Operating conditions
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
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
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
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
All generators are equipped with Class B Group 1 radio interference filters as defined by EN 55011
THD (Total Harmonic Distortion) / THF
Typically THD < 2% at no load / THF < 2%
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 code : 11000013 - M00FA122A
AVR Model : MARK VX
Dedicated AVR for optional PMG
AVR position
160 - 180 frame size: on left side viewed from D-End
225 - 250 frame size: front mounted
AVR supply
Mains. PMG or Auxiliary winding on request
Voltage sensing
Single phase
Accuracy
± 0,5% (@rated load, balanced and not deforming, P.F. 0,8)
EMI filter
Included
Limiters
U/F Under Frequency
Optional features
MXB-E series
-
160
180
225
250
Operating conditions
-
Special voltage
o
o
o
o
Provision for parallel operation with similar generators with AVR (MEC 20)
n/a
o*
o
o
Terminal box
-
IP55 terminal box
o
o
o
o(1)
Large terminal box
n/a
o
n/a
n/a
Separate auxiliary terminal box
n/a
o
o
o
Non-magnetic exit cable panel
n/a
n/a
n/a
o
6-leads winding
n/a
n/a
n/a
o
Heating
-
Anti-condensation heaters (V=220 V)
o
o
o
o
Temperature sensors
-
N. 3 PTC thermistors
o
o
o
o
N. 3 PT100 resistance temperature detectors in stator winding
n/a
o
o
o
N. 1 PT100 on N-End bearing
o
o
o
o
N. 1 PT100 on D-End bearing (for double bearing configuration)
n/a
o
o
o
N. 1 PT100 duplex type on N-End bearing
n/a
o
o
o
N. 1 PT100 duplex type on D-End bearing (for double bearing configuration)
n/a
o
o
o
Protection degree
-
Inlet filter
n/a
o
o
o
Inlet + outlet filter (IP43)
n/a
o
o
o
Inlet + outlet filter (IP44)
n/a
o
o
o
AVR
-
Single-phase sensing AVR (Mark VX), side mounted
s
s
o
o
Single-phase sensing AVR (Mark VX), front mounted
n/a
o*
s
s
Three-phase sensing AVR (MEC-20), side mounted
n/a
o*
o
o
Three-phase sensing AVR (MEC-20), front mounted
n/a
o*
n/a
o
Digital AVR D-Vo (mounted on board)
n/a
n/a
n/a
o
Automatic power factor regulator (mounted on board)
n/a
n/a
n/a
o
Painting
-
Special painting cycle (MM ref. F96831)
o
o
o
o
Painting colour different from RAL 9005 and RAL 5010
o
o
o
o
Painting colour RAL 9005 Black or RAL 5010 Blue (standard alternator not painted)
o
o
o
o
Special painting cycle (MM ref. F96819)
o
o
o
o
Special painting cycle (MM ref. F96826)
o
o
o
o
Environmental solutions
-
Tropicalization (CW1081)
o
o
o
o
Excitation system
-
Auxiliary winding
o
o
o
o
PMG with single-phase AVR (Mark XX) side mounted
o
o
o
n/a
PMG with single-phase AVR (Mark XX) front mounted
n/a
o*
o
n/a
PMG with three-phase AVR (MEC-20) side mounted
n/a
o*
o
o
PMG with three-phase AVR (MEC-20) front mounted
n/a
o*
n/a
o
PMG with digital AVR D-Vo (mounted on board)
n/a
n/a
n/a
o
Mechanical configuration
-
Special shaft extension
n/a
n/a
n/a
o
Second shaft extension (as per catalogue)
n/a
n/a
n/a
o
Special housing (2)
n/a
o
o
o
NDE grease nipple
n/a
n/a
n/a
o
DE grease nipple
n/a
n/a
n/a
o
Other accessories
-
N. 3 CT single core on neutral point (low voltage)
n/a
n/a
n/a
o
(*) 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