Alpha Technologies PWE-SG Series - Manual (Page 27)

27 033-090-C0-001, Rev. A
3.0 Maintenance
Establishing a routine of regular, preventative maintenance ensures the pole mount enclosure will
function for many trouble-free years.
Every three to six months:
Inspect the enclosure. •
Check for signs of rust and corrosion, paying particular attention to the battery trays. Clean any
rust or corrosion immediately.
Inspect the mounting brackets and hardware.
•
Carefully check for signs of unusual wear and loose hardware. Correct any deficiencies
immediately.
Check battery terminals and connecting wires.
•
Care of the batteries is essential to any maintenance program. In addition to voltage checks,
visually inspect the batteries for signs of cracking, leaking, or swelling. To aid in quick
identification and tracking of voltages in the maintenance log, use labels to number the batteries
inside the enclosure. Batteries are temperature sensitive and susceptible to overcharging and
undercharging. Since batteries behave differently in winter than in summer, Alpha's battery
chargers automatically compensate for changes in temperature by adjusting float and accept
charge voltages.
See the power supply's maintenance manual for instructions on maintaining the power supply.
Check each battery terminal and connection. Verify the posts are clean and the crimped
connectors are tight. Terminal connectors must be torqued to specification at installation and
then re-torqued to 50 inch/pounds during routine maintenance. If there is an "in-line" fuse in
the battery cable, check the fuse holder and fuse. Verify terminals are properly greased with an
approved battery terminal corrosion inhibitor such as NCP-2. Record date of maintenance in the
maintenance log.
Check battery open circuit voltage.
•
Switch the power supply's battery breaker to the OFF position. Disconnect the battery connector
from the inverter module andmeasure the individual voltage across each battery. The difference
between any battery in the string must not be greater than 0.3 VDC. Defective or marginal
batteries must be replaced with an identical type of battery. Record the unloaded battery voltages
in the maintenance log.
NOTE:
Whenever the power supply's battery breaker is turned OFF or the batteries are disconnected, the power
supply will not operate in inverter mode in the event of a utility power failure.