C&D Technologies UPS12-100MR - Connection Resistance

Symptom
Terminal voltage is
significantly below
the minimum voltage
specified for 10 sec.
point.
Battery is discharged
or battery conductive
path, plate grid or
active material or
electrolyte volume
deterioration.
Shorted.
Open cells.
Reduced
operating time.
Conducive to
thermal runaway.
Will not support load.
Charge and retest
battery or replace as
required.
Impedance/
resistance
increase by 50%
from original values
when new or
conductance decline
to 50% or the value
when new.
Battery is discharged
or Battery conductive
path, plate grid or
active material
or electrolyte
volume deterioration.
Shorted cells.
Open cells.
Reduced
operating time.
Conducive to
thermal runaway.
Will not support load.
Charge and retest
battery or replace as
required.
Connection
resistance
increase of
20% or more
from original value.
Repetitive cycles
resulting in heating
and cooling of
connection can
result in relaxation
of torque and an
increase in connection
resistance.
Contamination within
the connection can
result in corrosion
and high terminal
resistance.
Loose connections
can result in heat
damaged or melted
terminals during high
rate discharge.
Excessive voltage
drop during high rate
discharge and resulting
reduced operating time.
Retorque the
connection
as required.
Correct the source of
contamination, clean the
contact surface areas,
grease the contact
surfaces with
antioxidant
grease and reassemble.
Possible Causes Possible Result Corrective Actions
BATTERY
IMPEDANCE/
CONDUCTANCE
TEST
CONNECTION
HARDWARE
RESISTANCE/
TIGHTNESS CHECK
TABLE 1-VRLA Battery Symptoms and Solutions (Continued)
41-7546/0213/CD 18 www.cdtechno.com