Manual

9
745-680-B8-002, Rev. B
Torque specications
Torque specications are 8.4Nm (75lbf-in). Torque all terminal connections to the specied value.
Improper torquing can result in loose connections or damaged terminals.
Electrolyte
The electrolyte is sulfuric acid with a specic gravity of 1.320 at 77ºF (25ºC) and has the same purity
characteristics as other types of high quality lead acid batteries.
Short circuit
SMU-F batteries are designed to withstand a short circuit current for 1 minute without damage.
Cycling
The SMU-F range of batteries will deliver 200 cycles (at C
8
to 1.75Vpc and 77ºF (25ºC)).
Life
The end of service life of a battery is dened as the point at which the battery’s actual capacity
has reached 80% of its nominal capacity. The design life of the FA family of batteries is 15 years
of oat life. However, since users cannot often duplicate laboratory conditions, such as controlling
temperature, voltage, and AC ripple, this period may vary. Battery life will decrease by roughly half for
every 14.4–18ºF (8–10°C) above or below nominal operating temperature (68ºF (20°C)).
Low Voltage Interruption
Because the DC load will shut off if the voltage gets too low, damaging equipment, Alpha
Technologies recommends the use of Low Voltage Disconnects (LVDs) to maximize battery life.
LVDs protect sensitive equipment from low voltages, and prevent the battery from being over-
discharged. LVDs can be placed on either the load or battery side.
A string of batteries is a series of individual 2V cells working together. After discharge, the voltages
of individual cells vary based on the exact capacity of each cell. Most users try to terminate the load
when the batteries reach 1.75Vpc to ensure no individual cells fall below 0 VDC. Cells that fall below
0 VDC are said to be reversed. Alpha Technologies strongly recommends that cells which have been
reversed be replaced immediately.
1.0 Introduction, continued
1.2 Specications and General Information
Table 1-1, Mechanical Specications
Fig. 1-1, Dimensions
Type
Length
(in/mm)
Width
(in/mm)
Height
(in/mm)
Weight
(lb/kg)
Standard Stud Size *
SMU-F 12-50-FR 15.4/390 4.1/105 8.9/227 47.4/21.5 8mm
SMU-F 12-75-FR 21.9/558 4.1/105 8.9/227 68.3/31.0 8mm
SMU-F 12-85-FR 15.6/395 4.1/105 10.6/270 69.5/31.5 8mm
SMU-F 12-105-FR 20.1/511 4.3/110 9.4/238 79.4/36.0 8mm
SMU-F 12-125-FR 21.9/558 4.9/125 10.6/270 108.0/49.0 8mm
SMU-F 12-155-FR 21.9/558 4.9/124 11.1/283 119.0/54.0 8mm
SMU-F 12-170-FR 21.9/558 4.9/124 12.2/310 129.8/59.0 8mm
*optional 6mm stud available
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