Smr Menu Sleep Mode - Rectifier RT9- 24V Installation, Operation And Technical Manual

Installation, Operation and Technical Manual

6.7.2 SMR Menu Sleep Mode

The MCSU4 has an optional Rectifier Sleep Mode (RSM) in order to maximize the power
conversion efficiency of the overall DC Power System controlled by the MCSU4.
The RSM accepts a user-configured:
o Minimum number of Rectifier to keep On-Line at all times.
o Rectifier rotation value (in Days).
The RSM continuously monitor the % output power from each Rectifier in the system
and calculate the average Rectifier output power for all Rectifiers on line. The RSM
continuously works to achieve an actual average Rectifier output power that is within an
acceptable range by automatically placing Rectifiers On-Line and into Sleep mode.
The RSM calculates the acceptable range (minimum to maximum), centred on the target
power conversion efficiency, by considering the following:
o The target power conversion efficiency.
o The number of Rectifiers in the system.
o The output capabilities of the Rectifier.
o Sufficient hysteresis to as not to cause Rectifiers to constantly being placed On-
Line and back into Sleep mode.
The RSM make decisions on which rectifiers to place On-Line and which ones to place
into Sleep mode based on the following criteria:
o When needing to place a rectifier in Sleep mode, the rectifier with the highest usage
shall be selected.
o When needing to place a rectifier On-Line, the rectifier with the lowest usage shall
be selected.
o Usage shall me determined with the accumulated Run Time (Hrs) or Thru-put
(kWHr) which is kept in the rectifier. The determination on which value to use
is configured via the factory configuration file.
The RSM allows for sufficient time after placing a Rectifier On-Line or into Sleep mode in
order for the output of all Rectifiers to settle and the average Rectifier output power to be
valid again. The RSM always ensure that the minimum number of Rectifier to keep On-
Line is maintained.
The RSM provides a Rotation function to ensure that Rectifiers usage is being kept fairly
even. The Rotation shall be accomplished by forcing a Rectifier, with the lowest usage,
On-Line. This will cause the average Rectifier output power to fall below the acceptable
range and the RSM to then place the Rectifier with the highest usage into Sleep mode.
The RSM automatically and immediately cease operation upon receipt of any alarm from a
factory defined list (i.e. Battery Discharge, Voltage Low, SMR Current Limit,...).
The RSM function can be enabled and disabled by the user via the front panel and
WinCSU-2.
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Rectifier Technologies
19-Feb-14