HARDWARE MANUAL Document reference MAMPS-HW/E
VM600 machinery protection system (MPS) Edition 18 - March 2022
2-22
RPS6U rack power supply (ABE04x only)
OVERVIEW OF VM600 MPS HARDWARE
One or two RPS6U power supplies can be installed in an ABE04x rack, as shown in
Figure 2-1. When two RPS6Us are installed in a rack, the RPS6U on the right (slots 18 to 20)
is power supply 1 (PS1) and the RPS6U on the left (slots 15 to 17) is power supply 2 (PS2).
A rack can have two RPS6U power supplies installed for different reasons:
• In order to support rack power supply redundancy
See 2.10.5 Racks with two RPS6U rack power supplies in order to support rack power
supply redundancy.
• In order to supply power to the cards (non-redundantly)
See 2.10.6 Racks with two RPS6U rack power supplies in order to supply power to
the cards.
NOTE: A VM600 rack configuration with two RPS6U power supplies (330 W) operating
non-redundantly to supply power to the cards is typically only necessary for a full
rack of cards in an application where the operating environment requires RPS6U
output power derating.
The number and version of RPS6U power supplies installed in a VM600 rack, together with
the number of cards installed and the environmental conditions, helps determine the mode of
operation of the RPS6U power supplies as either redundant or non-redundant.
NOTE: To verify that a VM600 rack containing two RPS6U rack power supplies is a
non-redundant or a redundant rack power supply configuration, contact your local
Meggitt representative.
2.10.4 RPS6U rack power supply and VM600 card considerations
The maximum number of cards that can be installed in a VM600 system rack (ABE04x)
depends on RPS6U rack power supply considerations:
• The number of RPS6U supplies installed in the rack: one or two.
• The power capability of the RPS6U supplies installed in the rack: 330 or 300 W.
• When two RPS6U supplies are installed in the rack, the mode of operation of the RPS6U
supplies: redundant or non-redundant.
• The operating temperature of the environment where the VM600 rack is installed:
RPS6U power supplies require either output power derating and/or forced-air cooling for
operating temperatures of 50°C (122°F) or higher.
The maximum number of cards that can be installed in a VM600 system rack (ABE04x) also
depends on individual VM600 card considerations, for example, the configuration of sensor
power supplies and DC outputs for MPC4 / IOC4T card pairs. In general:
• A VM600 system rack with one RPS6U power supply (330 W) operates non-redundantly
(that is, without rack power supply redundancy) and supports a full rack of cards.
For example, up to 12x MPC4/IOC4T or 12 x XMx16/XIO16T card pairs or any other
combination of cards, for operating temperatures up to 50°C (122°F).
• A VM600 system rack with two RPS6U power supplies (330 W) operating
redundantly (that is, with rack power supply redundancy) supports a full rack of cards.
For example, up to 12x MPC4/IOC4T or 12 x XMx16/XIO16T card pairs or any other
combination of cards, for operating temperatures up to 50°C (122°F).
When two RPS6U rack power supplies operate redundantly to supply power to the cards
in a VM600 rack, the maximum current available for use by the cards is limited to the
current available from a single RPS6U power supply.
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