4
MAINTENANCE
Always wear eye protection when working on or near
batteries. Keep sparks and open flames away from
batteries at all times.
Consult User Manual of specific application for
additional Safety & Operating requirements.
Annual Inspection
Depending on the application, some of the following
recommendations may not apply.
1. Conduct a visual inspection of the battery(ies).
2. Record battery and /or string voltage. The accuracy of
the DMM (Digital Multimeter) must be 0.05% (on dc
scale) or better. The DMM must be calibrated to NIST
traceable standards. Because voltage readings are
affected by discharge and recharges, for cyclic applica-
tions, the battery(ies) must be in a fully charged
condition prior to taking readings. Batteries should be
within ± 0.30 volts (+ 0.15 volts for 6V) of the average
battery float voltage.
3. Record charger voltage.
4. Record the ambient temperature.
5. Record individual battery ohmic readings.***
6. Record all interunit and terminal connection resistances.
Micro-ohm readings should be taken during this inspec-
tion. If any reading is greater than 20% from initial
readings, retorque the connection. Recheck the micro-
ohm reading. If the reading remains high, clean contact
surface according to installation portion of this manual.
*** Note: To provide accurate / consistent values,
battery(ies) must be fully charged, at same temper-
ature and probes placed at same location each
time readings are taken.
MAINTENANCE
(con’t)
Rectifier Ripple Voltage
FREQUENCY
Ripple that has a frequency greater than 667Hz
(duration less than 1.5ms) is acceptable, unless it
is causing additional battery heating.
Ripple that has a frequency less than 667Hz (duration
greater than1.5ms), must meet the following voltage
specification to be acceptable.
VOLTAGE
Ripple voltage shall be less than .5% peak to peak
of the manufacturer’s recommended string voltage.
Battery Cleaning
Batteries, cabinets, racks, and modules should be
cleaned with clean water. If neutralizing is required, use
a mixture of baking soda and water. Use clean water to
remove baking soda residue. Never use solvents to
clean the battery(ies).
Capacity Testing
Capacity tests should not be run unless the battery’s
operation is questionable. Do not discharge the
battery(ies) beyond the specified final voltage. When
discharging at higher rates, extra connectors may be
required to prevent excessive voltage drop. When
performing capacity testing and recording data use
applicable standard and/or User Manual.
Should it be determined any individual battery(ies)
or cell(s) need to be replaced, contact your nearest
MK Battery agent or MK Battery.
®
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