26 | Operations Manual
System is not going into Charge state (SOC < 90% and all batteries between 15°C – 40°C) – Contactor Control
Power Status is Red.
• Open and close the breaker and the state should be reset.
Battery voltage or temperature is not reading correctly:
• Check for lose or poor connections on the spade/quick connect terminals on the battery terminals.
• Check for connection issues like shown in the picture where the Quick Connect is not attached correctly (did
not go over the QC correctly). Also the Torque Seal is broken here, so this bolt should be re-torqued.
(Torque to: 9.1 +/- 0.9 N-m)
• After checking connections, power cycle the BMS via the ON/OFF switch to verify if condition persists.
During a charge or discharge the battery voltages are not aligned.
• Generally all the batteries will be /-0.3V of one another. If that is not the case there maybe a short to
chassis ground or problem with the harness.
• Check to see which Secondary Processing Unit batteries have the issue and inspect connections and measure
voltages around those batteries. Try to plug and re-plug the SPU connections near batteries and in the BMS
box.
Maintenance Instructions
ONLY AUTHORIZED PERSONNEL CAN PERFORM MAINTENANCE.
a. Ensure that the battery string circuit breaker is open before performing any maintenance action that
creates the potential for making contact with any battery or exposed conductive components.
b. Perform visual inspection of battery trays, batteries, fans, and visible cabling to ensure that all components
are clean and don’t exhibit any indications of heat, breakage, or chaffing of any wire or cable.
c. If required, annual inspection and measurement of individual battery voltage and intercell connector resis-
tance can be accomplished by withdrawing one battery shelf at a time.
• If intercell connection resistance is more than 15% higher than the string average, disconnect, clean
and reconnect the cable, retorquing to the proper torque value. (9.1 +/- 0.9 N-m)
d. There is no need for discharge on an annual basis. The discharge requirement will be on a site by site basis
as directed by the customer.
Note: Before energizing the system, verify that the busbars has been connected and torqued correctly.
