9400016-J0 Rev E
48
User Guide
CXPS-E3
CAUTION!
Before removing a controller from a live system or performing controller maintenance, an
external LVD override is required to avoid a disruption of service.
9.1 400A LVD override operation
The LVD Control functions are hardwired directly from the assigned relay output to an optional LVD override
control located in the CXPS-E3 distribution panel below the breakers. The override bypasses the LVD Auto
CAUTION!
Do not leave the switch in the OVERRIDE position. Doing so may result in a complete discharge
of the batteries during a power failure situation.
control function. The LVD Override board has three indicators:
1. BUS PWR: On (Green) if voltage is present on the bus which powers the LVD coil.
2. COIL PWR: On (Green) if the coil is powered (and LVD is closed). If the LVD Override switch is in the
NORMAL
position, a Green LED indicates that the controller has activated the LVD.
3. Override: On (Yellow) confirms that the LVD Override switch is on. Note that the status of the LVD Override
switch is also available through the controller when present.
Place the LVD Control switch to the OVERRIDE position to keep the LVD contactor engaged.
To allow the controller to resume automatic control of the LVD contactor, check that the AUTO IN (green) LED is
lit confirming that the controller will keep the LVD contactor engaged. Then you can return the LVD Control switch
to the NORMAL position.
9.2 600A LVD override operation
Refer to
"4.11 600A LVD override" on page 23
for more information.
