GE Industrial Solutions CPS6000-M2 - Manual (Page 125)

CPS6000-M2 Installation Guide H5694720
Issue 8 January 2008 125
• User sets the plant state to Float via the user interfaces.
Once initiated, the boost mode may be exited by placing the Plant State to Float.
Auto-Boost Charge
This feature may be enabled from the front panel or other remote access means. When enabled,
the plant enters the boost-charging mode of operation following a battery discharge once the BD
alarm has been retired, provided the duration of the discharge was greater than 4 minutes. The
controller will not enter the auto-boost-charging mode if the discharge duration was less than 4
minutes.
When in auto-boost mode, the controller raises the plant voltage to the value selected by the user.
The controller keeps the plant in this mode of operation for a minimum of 5 minutes.
The exit conditions for the Auto-Boost Charge are the same as those for Boost Charge.
Redundancy Loss Function
This feature must be enabled from the front panel. The controller determines the number of
rectifiers present and compares the actual currents being drawn by the load to that produced by
the total number of rectifiers less one. If the measured load current exceeds the N rectifier’s
capacity for over 1 min, the alarm condition is activated. The alarm condition is latched on until
the Clear Events command is activated from the front panel.
This feature may be used by customers to determine if the load being served is greater than N
rectifiers worth, in an N+1 system. That is, the load requirements have changed such that the
power system is no longer operating as a redundant power system. An additional rectifier may be
required to ensure continuous redundant operation.
If enabled, this feature will be disabled during battery discharge and recharge conditions. It will
be enabled when the battery charging current falls below 5A.
Battery Voltage Imbalance Detection
Millennium II controllers utilizing the MCR1 (848704268) main circuit pack hardware does not
support the Battery Voltage Imbalance Detection feature. The Battery Mid-String Voltage
Imbalance detection feature is available only with Millennium II controllers that utilize the
MCR1B (CC109126307) version of the main circuit pack. This feature requires the use of the 1-
Wire ES771A Remote Voltage Monitoring Module.
Millennium II controllers with the MCR1B will automatically enable this feature when it detects
the presence of an ES771A module. The ES771A module should be placed in the electronics
cabinet. It will utilize the QS873A VT-Probes to obtain the voltage of the mid-string battery
voltage for monitoring. The VT-Probe is to be placed on the negative battery terminal located in
the middle of the battery string. The Millennium II has data on the plant voltage and its mid-string
value. This mid-string voltage measured from each monitored battery string is compared to the
plant voltage minus the measured half-string voltage. If the comparison results in a difference of
greater than the programmed voltage difference, 1.7V by default, for longer than 24 hours, the
alarm is asserted. The alarm may be retired by initiating the Clear Events command from the
front panel.