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
- 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 machineMaterial 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 typeMade 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 dataSingle 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 processCW1081 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 VXDedicated AVR for optional PMG |
| AVR position |
AVR position
On right side viewed from D-End225 - 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
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