POWER REQUIREMENTS
INTRODUCTION
The system requires two independent power inputs:
main power supply
Magnet monitor power
SPECIFICATIONS OF MAIN POWER INPUT
Power input must be separated from any others which may generate transients (elevators, air conditioning,
radiology rooms equipped with high speed film changers...).
Total harmonic distortion less than 2.5%.
Phase imbalance must not exceed 2%.
SPECIFICATIONS OF MAGNET MONITOR POWER
Power Supply (3
G)
Frequency 50Hz/60Hz
480
415
400
380
208
200
Total Current
60.1
66.8
69.3
72.9
N/A
N/A
Maximum input
power (5 sec max)
59.15 kVA
Stand-by power
13.4 kVA at 0.9 lagging Power Factor including 4.4 KVA for PDU
and 9KVA (continuous operation) for Shield/Cryo Cooler Cabinet.
Critical Power Requirements is different per each configuration.
POWER INPUT
EMERGENCY LIFE-SAFETY POWER SINGLE PHASE + N +G
POWER DEMAND
2.0 A
VOLTAGE
110/220V
FREQUENCY
50 / 60 Hz
CABLES
Power and cable installation must comply with the distribution diagram.
Size of the Main power input cable is determined by the customer, taking its length and admissible voltage
drops into consideration.
All cables must be isolated and flexible, cable color codes must comply with standards for electrical
installation.
The cables from signaling and remote control (Y,Emergency Off Buttons,L...) will go to the Distribution
Panel/Box with a pigtail length of 1.5m [60in], and will be connected during installation.
Each conductor will be identified and isolated (screw connector).
GROUND SYSTEM
The equipotential link will be by means of an equipotential bar.
The grounding point of Distribution Panel/Box is directly connected to the building's ground by an isolated
copper cable.
The impedance of the earth bar should be less than or equal to 2 ohms
MAIN DISCONNECT PANEL (MDP)
NEUTRAL
GROUND
NEUTRAL MUST
BE TERMINATED
INSIDE THE MDP
NEUTRAL
BUSS BAR
G/PE
BUSS
BAR
CB#1
3-Black
1-White
1-Green
FACILITY
INPUT
POWER
(480-V,
3 Phase)
Cable SUPPLIED BY CUSTOMER
Equipment SUPPLIED BY GE
Equipment SUPPLIED BY
CUSTOMER
Cable SUPPLIED BY GE
POWER DISTRIBUTION
NOTES:
RUNS 296 AND 297, & POWER CORDS FOR SHIELD/CRYO COOLER
COMPRESSOR CABINET, MRCC, & MAGNET MONITOR EQUIPMENT (MAGNET
MONITOR, UPS INPUT & OUTPUT, MODEM, OPTIONAL MULTIPLEXER) ARE
GE SUPPLIED CABLES. ALL OTHER WIRING IS CUSTOMER SUPPLIED.
TWO REMOTE EMERGENCY "OFF" BUTTONS ARE SUPPLIED WITH GE MDP
OPTION, EMERGENCY OFF BUTTONS ARE CUSTOMER SUPPLIED IF GE MDP
OPTION NOT USED.
CIRCUIT BREAKERS ARE PROVIDED FOR PDU, CRYO COOLER COMPRESSOR
CHILLER, GRADIENT CHILLER, SHIELD/CRYO COOLER COMPRESSOR CABINET,
MAGNET MONITOR EQUIPMENT CIRCUITS.
ALL BRANCH CIRCUITS DROP OUT ON LOSS OF POWER. COLDHEAD MRCC,
GRADIENT MRCC, SHIELD/CRYO COOLER COMPRESSOR CABINET, & MAGNET
MONITOR EQUIPMENT AUTOMATICALLY RESTART AFTER 3 SEC TIME DELAY
UPON RESTORATION OF POWER. EMERGENCY OFF LOCKS OUT ALL
CONTACTORS.
IF 3 PHASE WYE WITH NEUTRAL AND GROUND (5 WIRE SYSTEM) INPUT USED
THEN NEUTRAL MUST BE TERMINATED INSIDE THE MAIN DISCONNECT
PANEL AND NOT BROUGHT TO THE POWER CABINET.
SUPERVISORY CIRCUIT FOR HVAC INTERLOCK CONTACTS OPEN ON LOSS OF
DC POWER OR EMERGENCY OFF POSITION.
EQUIPMENT ROOM
"EMERGENCY OFF"
BUTTON
MAGNET ROOM
"EMERGENCY
OFF" BUTTON
PENETRATION
PANEL (PP1)
ARM = AUTO
RESTART MODULE
SHIELD/CRYO COOLER
COMPRESSOR CABINET
(MS5)
GND
FACILITY POWER (24
HOURS/DAY, 7 DAYS/WEEK)
RECOMMENDED TO MAXIMIZE
PROPER UNINTERRUPTED
MAGNET OPERATION FOR
SHIELD/CRYO COOLER
COMPRESSOR CABINET & CRYO
COMPRESSOR CHILLER (MRCC) IF
SUPPLING WATER COOLING FOR
SHIELD/CRYO COOLER
COMPRESSOR CABINET
GROUND STUD OF
SYSTEM CABINET
TO TERMINAL STRIP IN PDU
MODULE LOCATED
BOTTOM OF SYSTEMS
CABINET
POWER DISTRIBUTION UNIT
(PD1)
SYSTEM CABINET
SPLICE
ARM
ARM
CB #3
CB #5
CB #2
EMER-GENCY
OFF MODULE
SUPERVISORY
CKT FOR HVAC
INTERLOCK
CONTACTS
AUTO RESTART
CONTROL
CIRCUIT
120
VAC
FUSES
ARM
CB #3
A
B
C
{
NC
NC
RF SHIELD
RUN 296
RUN 297
BLK
BLK
RED
RED
CB AMPS
1
150
2
100
3
20
4
20
5
30
6
15
7
35
Date
Rev
/24
EN-MRI-TYP-SIGNA_EXPLORER-WEB.DWG
A
03/Aug/2018
SIGNA EXPLORER /SIGNA CREATOR
Typical
E5 - Power Requirements
23
FEEDER TABLE
MIN. feeder wire size,
AWG or MCM (sq. M)/VAC
Minimum feeder wire length - ft (m)
100 (30.5)
150 (46)
200 (61)
250 (76)
300 (92)
350 (107)
400 (122)
450 (137)
480 VAC
1/0 (70)
1/0 (70)
1/0 (70)
1/0 (70)
1/0 (70)
1/0 (70)
1/0 (70)
1/0 (70)
Ground req'd
6 (17)
6 (17)
6 (17)
6 (17)
6 (17)
6 (17)
6 (17)
6 (17)
GENERAL NOTES
In all cases qualified personnel must verify that the feeder (at the point of take-off) and the run to the MR system meet all the requirements
stated in the PIM
For a single unit installation, the minimum transformer size is 112.5KVa. Regulated transformer is not required unless voltage changes
/- 10% over a period of 1 hour or longer
Grounding conductor will run from the equipment back to the power source/main grounding point and always travel in the same conduit
with the feeders
