Document reference MAMPS-HW/E HARDWARE MANUAL
Edition 18 - March 2022 VM600 machinery protection system (MPS)
2-23
RPS6U rack power supply (ABE04x only)
OVERVIEW OF VM600 MPS HARDWARE
• A VM600 system rack with two RPS6U power supplies (330 W) operating
non-redundantly (that is, without rack power supply redundancy) supports any
combination of cards under all circumstances, including operating temperatures up to
70°C (158°F).
When two RPS6U rack power supplies operate non-redundantly to supply power to the
cards in a VM600 rack, the maximum current available for use by the cards is limited to
approximately 125% (x 1.25) the current available from a single RPS6U power supply.
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.
For a VM600 rack configuration that contains more than ten processing cards (MPC4/IOC4T,
AMC8/IOC8T and/or XMx16/XIO16T) together with a CPUM/IOCN “rack controller” and/or
RLC16 relay cards, the power consumption of the rack should be calculated in order to
determine the number of RPS6U power supplies required and the permitted modes of
operation. Contact your local Meggitt representative for further information.
2.10.5 Racks with two RPS6U rack power supplies in order to support rack power
supply redundancy
A VM600 rack with two RPS6U power supplies installed can operate redundantly (with rack
power supply redundancy) for a full rack of cards. This means that if one RPS6U fails, the
other will provide 100% of the power requirement and the rack will continue to operate,
thereby increasing the availability of the machinery monitoring system.
NOTE: This is known as a redundant RPS6U rack power supply configuration.
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.
During the normal operation of a rack with two RPS6U power supplies installed, each supply
typically provides 50% of the power requirement. In practice, the current load share can be
anywhere between 20 to 80% (and 80 to 20%) due to imbalances. This is the case for all
VM600 racks with two RPS6U rack power supplies installed, whether “redundant” or not.
However, if one power supply fails on a redundant rack, the other will provide 100% of the
power requirement and the rack will continue to operate, thereby increasing the availability of
the machinery monitoring system.
2.10.6 Racks with two RPS6U rack power supplies in order to supply power to
the cards
A VM600 rack with two RPS6U power supplies installed can operate non-redundantly
(without rack power supply redundancy). Typically, this is only necessary for a full rack of
cards in applications where the operating environment requires RPS6U output power
derating.
NOTE: Even though two RPS6U rack power supplies are installed in the rack, this is not a
redundant rack power supply configuration.
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