Exide Technologies Section 92.30 - Manual (Page 10)

7.7 CONNECTION RESISTANCE
Electrical integrity of connections can be objectively established by measuring the resistance of each
connection. These resistances are typically in the microhm range. Meters are available which
determine connection resistance in microhms. Be sure that the probes are touching only the posts to
insure that the contact resistance of connector to post is included in the reading.
Resistance measurements or microhm measurements should be taken at the time of installation and
annually thereafter. Initial measurements at installation become the bench mark values and should
be recorded for future monitoring of electrical integrity.
It is important that the bench mark value for all similar connections be no greater than 10% or 5
microhms, whichever value is greater over the average. If any connection resistance exceeds the
average by more than 10% or 5 microhms, whichever is greater, the connection should be remade so
that an acceptable bench mark value is established.
Bench mark values for connection resistances should also be established for terminal plates, where
used, as well as cable connections. Bench mark values should preferably be established upon
installation.
All bench mark values should be recorded. Annually, all connection resistances should be remeasured.
Any connection which has a resistance value 20% above its bench mark value should be corrected.
7.8 CELL NUMERALS
A set of pressure sensitive battery numerals and system polarity labels are supplied and should be
applied at this time.
Battery numerals should be applied to a visible location on the battery. Designate the positive terminal
battery as unit #1 with succeeding units in series in ascending order.
The system polarity labels should be applied next to the positive and negative terminals of the battery
string.
SECTION 8 - INITIAL CHARGE
8.0 CONSTANT VOLTAGE METHOD
Batteries lose some charge during shipment as well as during the period prior to installation. A battery
should be given its initial charge at installation.
Constant voltage is the only charging method allowed. Most modern chargers are of the constant volt-
age type.
Determine the maximum voltage that may be applied to the system equipment. This voltage, divided by
the number of cells connected in series, will establish the maximum volts per cell (VPC) that may be used.
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