EFX48-xx Series with RM3-340/440 Installation and Operation Guide
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Copyright © 2019 Eaton Corporation. All Rights Reserved.
IPN March 2019
Temperature Compensation
Temperature compensation is a function that allows the battery float voltage to be automatically
adjusted to ensure that the optimum voltage is applied to the battery under all temperatures.
The following parameters control the temperature compensation function:
• Temperature compensation enable or disable
• Reference temperature 0-50ºC
• Slope -10 to -0.1mV/ºC
• Upper temperature limit 0-60ºC
• Lower temperature limit -40 to +20ºC
The reference temperature is the temperature which is the zero point for applying
compensation.
For example if the reference temperature is 20°C and the battery is 20°C no adjustment is
applied, but at temperatures above or below 20°C compensation is applied.
Slope is the amount of compensation applied per 1°C of temperature difference from the
reference temperature. The slope setting is per cell and assumes that there are 24 cells.
For example -10mV/°C then again if t ref = 20°C and reported t=30°C then
(10*-10mV*24cells) correction would be applied to the bus voltage.
Upper and lower temperature limits are the temperatures above and below no further
correction is applied
Temperature compensation is applied to float, fast charge, equalise, battery test minimum
voltage, low float, low load, high float and high load voltage thresholds.
Battery Test
Battery Test is a preventative maintenance tool that monitors the discharge capabilities to
ensure that the condition of the battery has not deteriorated over time.
The EFX48 temporarily reduces the output voltage of the rectifiers to below the fail voltage
threshold for the set duration. The battery then supplies power to the load. A battery test passes
if the battery voltage remains above a predetermined level for the duration of the test.
Battery Tests can be scheduled to occur at regular intervals, and/or can be started/stopped
manually.
The battery test function performs a periodic partial discharge test of the battery.
The following parameters can be set :
• Enable - battery test yes or no
• Capacity (Ah) The complete capacity of the battery
• Float time – qualification in float state 1-120hrs
• Proportion - of capacity to be removed 5-100% capacity
• Maximum duration - that a test will run 10-900mins
• Threshold – voltage causing test end 40.00-55.00V
• Period - between subsequent tests 7-730 days
• Next date - first date and time for a test Time and date
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