GE Industrial Solutions CPS6000 - Manual (Page 195)

CPS6000 –48V Indoor/Outdoor Power Shelf
Issue 21 January 2008
195
• The controller receives either a High-Voltage, Rectifier Fail alarm, or High-Battery
Temperature alarms
• User sets the plant state to Float via the Controller.
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 Controller. See Appendix A for details. 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
This feature requires the use of the ES771A Remote Voltage Monitoring Module. Note that
this feature is automatically enabled if the controller detects the presence of the ES771A
module. This module is to be placed in the electronics cabinet and utilizes the QS873A VT-
Probes to measure the voltage of the battery string being monitored. The VT-Probe is to be
placed on a battery terminal in the middle of the battery string. The CPS6000 controller has
data on the plant voltage; the half-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 1.7V for longer than 24 hours, the alarm is asserted. The
alarm may be retired by initiating the Clear Events command from the front panel.
After this feature has been enabled, the system waits for 12 hours to ensure the battery strings
are stable. A battery string is considered to be stable if the charging current is less than 3A. If
a stable battery string yields a difference measurement greater than 1.7V for over 12
continuous hours, a Battery Voltage Imbalance alarm is generated.