9. Servicing
The order of these steps must be followed in order to maximize the life of the
components (the contactors in particular).
In order to service the stack (including the battery itself), perform the following steps:
1. Allow the battery to come to rest (no current).
•
This may involve sending commands to the power conversion system.
2. Using the Operator Interface, disconnect the stack by clicking the
Disconnect
button.
•
for instructions on connecting/disconnecting a stack.
•
This initiates the disconnection sequence.
•
Wait for the connection state to show
Stack Disconnected
.
3. Put the Service Disconnect switch in the
OFF
position and insert a lock-out / tag-out.
The battery stack can now be serviced. To bring the stack back into operation, perform the following
steps:
1. Remove the lock-out / tag-out and put the Service Disconnect switch in the
ON
position.
2. Address any faults if necessary (using the Operator Interface).
•
All faults must be cleared for Stack Switchgear to close contactors.
3. Using the Operator Interface, connect the stack by clicking the
Connect
button.
•
for instructions on connecting/disconnecting a stack.
•
This initiates the connection sequence.
•
Wait for the connection state to show
Connected
.
The stack is now connected to the DC bus.
The battery stack terminals are always energized and should be handled as such.
Although the DC bus terminals are disconnected from the battery by the Stack
Switchgear unit’s contactors, the DC bus can still be energized by other components
on the DC bus (e.g. power conversion system or other stacks). The DC bus terminals
should always be treated as though they were energized.
A simple voltage check (i.e. across the positive and negative terminals) is not always
sufficient,
especially
with grounded battery stacks. It is recommended to also check
for voltage between each conductor and ground.
Nuvation Energy High-Voltage BMS - Product Manual
Document ID: NE-PM-003
82
Rev 1.2, 2021-03-03
Curie Update 1
