Fiamm FLX Руководство по установке и эксплуатации - Страница 8

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1. Installation

FIAMM Industrial Batteries

FIAMM AGM Valve Regulated Recombination Batteries: FLX Series- Engineering Manual

Float operation for standby use

For standby applications the recommended float voltage window is between 2.25 to 2.30 volts per cell

depending on the model and on site temperature, as showed in table 4 (charger's float voltage

tolerance is within ± 0.005 volt per cell).

Residual current

Whenever battery chargers are working properly (and in accordance with manufacturer instructions) it is

normal to have a residual float current in fully charged batteries. Residual float currents will slowly

increase during a batteries life and according to cycle frequency. Although the charger is set on a fixed

average voltage, it is normal to record a spread in voltage between each block inside a string. Voltage

variation within ± 250mV/battery is considered as a normal value particularly in the first 12 months from

initial installation.

Recharge following discharge for standby use and boost charge

At the first installation, or soon after a discharge, the recommended recharge method is to use a

constant voltage equal to the float charge voltage with a maximum charge current of 25% of nominal

capacity.

To reduce the recharge time, the IU recharge method can be used with a higher voltage of 2.35-2.40

V/cell at 77° F for 24 hours and a current limit of 0.25 C

should be applied only when batteries are not in a fully charged condition and need to be recovered in a

short period of time.

The battery should be placed back on float as soon as possible, ideally as soon as the charge current

has dropped below 20 mA/Ah (or lower if the application has frequent power failures).

Boost charge should be used only when necessary. Frequent equalize charging can result in more

water consumption, which will lead to reduced capacity and shortened battery life.

Float voltage and recharge procedures for frequent discharge applications

Whenever FIAMM FLX batteries are used in applications with frequent power failures (such as several

discharges a month) float voltage should be set at a higher range compared with a standby applications

range (i.e. from 2.27 to 2.30 volt per cell at 68-77° F). The recommended float voltage values necessary

to maximize the battery life at different temperatures are shown in table 4. The most important target in

this type of environment is to have the batteries recovering promptly after a discharge

This document and any confidential information it contains shall be distributed, routed or made available solely with written permission of

FIAMM. FIAMM reserves the right to change or revise without notice any information or detail given in this manual

Table 4 – FLOAT VOLTAGE VS SITE TEMPERATURE

Site Temperature

(° ° ° ° F)

100

104

Float voltage per cell

FLX

2.29

2.285

2.28

2.275

2.27

2.265

2.26

2.255

2.25

2.245

2.24

2.235

2.23

. This process, also called boost charging,

December 2012

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