GE Industrial Solutions Galaxy Pulsar Edge - Manual (Page 122)

Galaxy Pulsar Edge Power System Controller
Issue 3 October 2011
122
mounted in the grounded or non-grounded side of the DC bus in a ±24V or -48V power system.
The shunt must have a 50mV rating. Its current rating as well as its assignment to load or battery
is configured at the controller. Three leads are used to monitor the shunt: Shunt+, Shunt-, and
Shuntref. Shunt+ is the most positive side of the shunt input voltage as defined during a battery
discharge. Shunt- is the most negative side of the shunt input voltage as defined during a battery
discharge. Shuntref is the reference lead which must be attached to the DC side of the bus in
which the shunt resides to properly reference the circuitry.
Contactor Management: Controls and monitors one load or battery contactor. The contactor is
of the magnetic latching type equipped with an auxiliary switch for status. The board is designed
to drive both 24V and 48V rated contactors.
Reverse Battery Protection: The NE872A will prevent the closure of the battery contactor when
it senses batteries have been connected in reverse polarity. A Major alarm “Reversed Battery” is
generated by the system controller. When a battery disconnect breaker is used to take battery
strings off-line for servicing, care must be taken to ensure battery connections are correct at the
disconnect switch.
Autonomous Backup LVD Function: The NE872 monitors the system bus voltage to provide a
backup for the Low Voltage Disconnect (LVD) function. In the event of a loss of communication
between the NE872A due to a failed or removed controller, communication cable disconnect, etc.
the configured disconnect and reconnect values assigned to a particular LVD function at the
controller are used along with the boards internal measurement capability to control the LVD.
These disconnect and reconnect threshold values are sent from the controller to each respective
QS871A upon establishing initial communication.
8-Position Jumper: 8-position jumper arrangement that uniquely identifies up to eight NE872
remote distribution monitor and control modules. Placing no jumper, ID position 0, is an invalid
configuration. The Pulsar Edge can address up to eight unique NE872s. Note: factory ordered
systems are generally pre-configured and will have the jumpers appropriately set. Jumpers are
arranged as shown.
Figure 7-2: NE872A ID Jumper Settings
• 12-Position Jumper: 12-position jumper arrangement that configures the NES872 operate
in a positive of negative battery plant. The jumper is selected so that all polarity sensitive
items are selected at once by configuring one header. Note: factory ordered systems are
generally pre-configured and will have the jumpers appropriately set. The block jumper is
arranged as shown.
J12
ID1
ID2
ID3
ID4
J11
ID5
ID6
ID7
ID8