GE SIGNA Voyager, Pre-Installation, Page: 52 / 178

10.2 Main Disconnect Panel (MDP) Requirements
WARNING
PERSONNEL INJURY OR EQUIPMENT DAMAGE
CUSTOMER SUPPLIED MDP MUST HAVE CORRECTLY SIZED WIRES AND
RATED COMPONENTS TO MEET THE MR SYSTEM POWER
REQUIREMENTS.
WARNING
PERSONNEL INJURY OR EQUIPMENT DAMAGE
IF THE MDP POWERS THE CRYO COMPRESSOR, THE MDP EMERGENCY-
OFF FUNCTION MUST DISABLE THE AUTO RESTART FUNCTIONALITY
WHEN ACTUATED.
1. MDP to provide Auto-Restart. Auto-Restart to provide power to the Cryo compressor. See
Table 2-13
2. Manual Restart Capability
a. A low voltage release feature to disconnect the PDU upon power loss
b. The PDU circuit must require a manual restart when power is reapplied to the main
panel
3. Emergency Off Circuit
a. The MDP must have an emergency off control circuit that disables power to the entire
MR system
b. The emergency off circuit must be actuated by remotely located push button(s) (see
Illustration 2-14 )
c. The wire size for the emergency-off circuit is 12–22 AWG and is supplied by the
customer.
d. The manual reset must be required to restore power to the entire system
e. Two sets of isolated, normally closed contacts that open when an emergency off button
is actuated must be provided for optional accessories
4. Lock-out/Tag-out
a. The MDP break must have capability to lock-out for single point Lock-out/Tag-out
requirements
b. A standard sized hasp for lock-out
5. The MDP must be marked as required by national/local regulations
6. The MDP must provide terminations for all grounds entering, leaving and residing within the
panel
7. The MDP must provide terminations of appropriate size for all power wiring entering and
leaving the panel
a. Terminal blocks that can accept 3/0 AWG or larger on the main panel
SIGNA Voyager Pre-Installation
Direction 5680008–1EN, Revision 2
52 10 MR Suite Electrical Requirements