United Kingdom / English
MXB
Model MXB
Power Up to 375 kVA
Voltages Up to 480 V
Frame 160 ÷ 250
Poles 4
Cooling IC01 as per IEC 60034-6
IP IP23 as per IEC 60034-5 (up to IP 44)
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
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
Test Certificate supplied with the machine
Material certificates in accordance with EN 10204 : 2001 can be supplied
Main components
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
Aluminium alloy 46100S T6 (from 160 to 225 frame size)
Cast iron GJL 300 (250 frame size)
Shaft
Carbon steel - hot rolled (EN 10025 - S355 JR)
Terminal board
Made of Bakelite PF2736 7-pins (from 160 to 180 frame size) 9-pins (from 225 to 250 frame size)
Fan
PA 6.6 up to MXB 180 SC4 included - Aluminum alloy above
Construction
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 - IM 2105 from 180 to 250 frame size (double bearing available on request)
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
Bearing selection
Antifriction bearings
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
The no-load voltage wave form is sinusoidal with THD content less than 2% / 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
Auxiliary device
AVR model
AVR model 11000013 - MARK VX
Dedicated AVR for optional PMG
AVR position
On right side viewed from D-End
225 - 250 frame size front mounted
AVR supply
Auxiliary winding
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
Operating conditions
-
Special voltage including 380V, R3, R6 (LV only)
o
o
o
o
Provision for parallel operation with similar generators with AVR
n/a
o*
o
o
Terminal box
-
IP55 terminal box
o
o
o
o
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
N. 1 PT100 air inlet
n/a
n/a
n/a
o
N. 1 PT100 air outlet
n/a
n/a
n/a
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
Air to fresh water heat exchanger top mounted on generator (IP44)
n/a
n/a
n/a
o
Air to salt water heat exchanger top mounted on generator (IP44)
n/a
n/a
n/a
o
Air to air heat exchanger top mounted on generator
n/a
n/a
n/a
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
-
Non standard colour (MM ref. F96831)
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
-
PMG with single-phase AVR (Mark XX) side mounted
o
o
o
o
PMG with single-phase AVR (Mark XX) front mounted
n/a
o*
o
o
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
n/a
n/a
n/a
o
Neutral point terminal box for B2-B3-B34 construction
n/a
n/a
n/a
o
NDE grease nipple
n/a
n/a
n/a
o
DE grease nipple
n/a
n/a
n/a
o
Other accessories
-
Toothed wheel (n.60 teeth) with provision for speed sensor (sensor not included)
n/a
n/a
n/a
o
64R - Brush connection with rotor for earth fault detection (without protection device)
n/a
n/a
n/a
o
N. 3 CT single core on neutral point (low voltage)
n/a
n/a
n/a
o
(*)
this option includes also large terminal box
-
o:
optional |
n/a:
not available |
s:
standard