Maintenance - NorthStar NSB12-310 Applications Manual

Number of Strings = (3419 watts/2V cell) / 854.3
watts/2V cell = 3.998 cabinets, Round up to the nearest
whole number, or 4 strings of NSB12-730RT's required
to support 800kW l
11

Maintenance

11.1 Preparation for Periodic Maintenance
For optimum reliability, it is recommended that the
battery system be monitored quarterly. If the battery
system incorporates an automatic monitoring system
to gather the electrical and environmental data, the
quarterly checks are limited to the evaluation of the
recorded data and visual check of the battery.
Batteries will stabilize over a 30 day period at which
time the initial baseline for monitoring should be
recorded.
11.2 Required Maintenance Tools and Equipment
At a minimum, the following tools and equipment are
required to maintain and troubleshoot the batteries.
• Digital Voltmeter
• Socket Wrenches, Insulated
• Box End Wrenches, Insulated
• Torque Wrench calibrated in inch-lbs
• Appropriate level PPE (see NFPA 70E)
• Potable Eye Wash
• Spill Kit
• Fire Extinguisher (class C)
The following equipment is optional depending on the
type of maintenance to be performed.
• Micro-ohm meter
• Battery resistance, impedance, or conductance meter.
• 100 amp momentary load test set.
• System load bank (DC if to be performed at the
battery or AC if to be performed by loading the UPS
output).
• Thermal imager or infrared temperature scanner
Form: SES-541-01711
11.3 Quarterly Maintenance
The following checks should be completed quarterly.
• If installed, review all battery monitoring (BMS) data.
• Assure the battery room is clean, free of debris and
well lighted.
• Assure that all facility safety equipment is available
and functional.
• Measure and record the air temperature within the
battery room.
• Immediately record the battery or shelf temperature
when the cabinet doors are opened.
• With thermal imager or infrared temp scanner, check
batteries and links hot spots.
• Visually inspect the batteries for:
a. Cleanliness
b. Terminal damage, evidence of heating or corrosion.
c. Container or cover damage
d. Case swelling
• Verify the rectifier voltage setting.
• Measure and record the battery system DC float
charging voltage at the battery.
• Compare the rectifier setting and string battery
voltage for consistency.
• Measure and record the AC ripple voltage.
• Measure the DC voltage from each polarity of the
battery to ground to detect any ground faults.
• If possible, measure and record the battery system
DC and AC float charging current.
• Measure and record the individual unit DC float
charging voltage.
11.4 Semi-Annual Maintenance
• Repeat the quarterly checks.
• Optionally perform the 10 sec. high rate (e.g.
100 amp) load test to assure the individual batteries
are functional.
• If no battery monitoring service (BMS) is installed,
measure and record the resistance, impedance,
conductance of the individual units to trend the
condition of the individual units over time and to
detect dramatic differences between individual units
and the norm.
Issued: 12-08-16 ECO-101191