VM600 MPS hardware manual (standard version) MAMPS-HW/E 2 - 21
Edition 17 - February 2018
RPS6U rack power supply (ABE04x only)
OVERVIEW OF VM600 MPS HARDWARE
(x 1.25) the current available from a single RPS6U because of the way in which the power
supplies share the load. In practice, the current load share can be anywhere between 20 to
80% (and 80 to 20%) due to imbalances.
The later versions of the RPS6U power supply (330 W) can support a full rack of cards, for
example, 12 x MPC4/IOC4T or 12 x XMx16/XIO16T card pairs can be supported by one
330 W RPS6U for operating temperatures up to 50°C (122°F). This means that a VM600
rack with two 330 W RPS6U power supplies installed and operating non-redundantly is only
typically only necessary for applications where the operating environment requires RPS6U
output power derating.
The earlier versions of the RPS6U power supply (300 W) cannot support a full rack of cards,
for example, 9 x MPC4/IOC4T or 6 x XMx16/XIO16T card pairs can be supported by one
300 W RPS6U for operating temperatures up to 60°C (140°F). This means that a VM600
rack with two 300 W RPS6U power supplies installed and operating non-redundantly is
typically necessary for applications using more than nine cards. Contact Meggitt Sensing
Systems for further information
2.10.7 Racks supporting external mains power-supply system redundancy
It is important to note the difference between RPS6U power supply redundancy and external
mains power-supply system redundancy:
• RPS6U rack power supply redundancy requires that two RPS6U power supplies are
installed in the VM600 rack, so that should one power supply fail, then the other power
supply can continue to supply power the cards in the rack.
For information on the associated rear panels that can be used by a VM600 rack with or
without rack power supply redundancy, see 2.10.9.1, 2.10.9.2, 2.10.9.3, 2.10.9.5,
2.10.9.6, 2.10.9.7, 2.10.9.8, 2.10.9.9, 2.10.9.10 and 2.10.9.13.
• External mains power-supply system redundancy requires that two external mains
supplies (AC or DC) are used to supply power to the VM600 rack (which can have one
or two RPS6U power supplies installed). Should one of the external mains supplies fail,
then the other external mains supply can continue to supply power to the cards in the
rack.
For information on the associated rear panels that are required by a VM600 rack for
external mains power-supply system redundancy, see 2.10.9.4, 2.10.9.11 and 2.10.9.12.
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