8. Servicing
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.
•
This initiates the disconnection sequence.
•
Wait for the connection state to show
Stack Disconnected
.
•
for instructions on connecting/disconnecting a stack.
3. Put the Service Disconnect switch in the
OFF
position and insert a lock-out / tag-out.
The Stack Switchgear and its components 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.
•
Wait for the connection state to show
Connected
.
3. Using the Operator Interface, connect the stack by clicking the
Connect
button.
•
This initiates the connection sequence.
•
for instructions on connecting/disconnecting a stack.
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.
The order of these steps must be followed in order to maximize the life of the components (the
contactors in particular).
Nuvation Energy Stack Switchgear - Product Manual
Document ID: NE-PM-003
81
Rev 1.0, 2020-09-03
