Fiamm FET FG Series Manuel d'installation et d'utilisation - Page 11

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FIAMM Energy Technology S.p.A

8. BATTERY TEST

Test must be conducted in accordance with EN 60896-

21/22.

Before any discharging test batteries have to be properly

prepared with a boost charge (2.40 volt per cell for 24

hours at 20°C) to ensure they are in a fully charge

condition. In order to take temperature readings of a

battery, one pilot cell or block shall be chosen. The

surface temperature of the container wall centre of each

pilot cell or block shall be measured immediately prior to

the discharge test. The individual readings shall be

between 15°C and 30°C. The temperature of the selected

block shall be considered as representative of the average

temperature of the battery. It is desirable that the average

cell surface temperature and the ambient temperature fall

as nearer to the reference temperature of 20°C or 25°C as

possible.

In case of batteries having a capacity lower than 80% of

the nominal rating it is advisable to replace them within

12 months

Here below some precaution to be taken:

 Discharge must be stopped at the final discharge

voltage.

 Deeper discharges must not be carried out unless

specifically agreed with FET.

 Recharge immediately the battery after each (full or

partial) discharge test.

8.1. Service/Functional test

This is a test of the battery's ability to satisfy the design

requirements of the system. It means to discharge the

battery directly to the load

to ensure that a battery failure does not jeopardize other

equipment)

or dummy load to simulate a main failure.

1. Record the floating voltage of each cell, as well as

the total system voltage

2. Check the actual load (A or W), as well as the

minimum admissible voltage of the system

3. On FET discharge tables you can approx. determinate

the discharge rate (minutes of discharge) Please note

that battery performances change (decrease) with

battery age. After switching off the rectifier,

discharge the battery for a time of 20% of that

calculated discharge rate

4. During the discharge, record at regular intervals,

cell/block voltage, battery temperature, discharge

current, total battery voltage

5. For safety reason, during the test assure that the total

battery voltage remains

depending on discharging rate in order to avoid any

failure to the system (please note that approaching to

the final voltage, the voltage curve decreases rapidly)

6. For particular comments on test's data, please refer to

FET technical offices

This document and the confidential information it contains shall be distributed, routed or made available solely with written permission of FIAMM Energy Technology.

FIAMM Energy Technology S.p.A. reserves the right to change or revise without notice any information or detail given in this publication.

Installation & Operating Instruction -Technical Manual

(in this case take precautions

above the

minimum

8.2. Capacity test

Please carry out this test only when complete

information on the quantity of energy inside the battery

is requested.

Take precautions because after this test

battery SHOULD NOT BE ABLE TO SUPPLY

ENERGY IN CASE OF MAIN FAILURE.

Dummy load is usually necessary to provide the request

discharge current. Test is usually carried out to verify the

battery capacity to a specify end voltage and discharge

rate (usually 1, 3 or 10 hours).

Test must be conducted in accordance with EN 60896-

21/22. Please refer to prescription indicated in the above

standard. Record at regular intervals every half an hour

at the beginning, every 10 minutes the last half an hour

cell/bloc voltage, battery temperature on pilot cell,

discharge current, total battery voltage (in any case

voltage reading has to be made at least at 25%, 50% and

80% of the discharge time).

According

IEC60896-21

terminated when one of the following values t

whichever comes first, has been recorded:

= the elapsed time of discharge of the string,

disch

with n cells, to a voltage of n x U

= the elapsed time when the first of the unit in

disch

the string reached a voltage of

unit voltage

− ( √

= U

final

At the end of discharging test, batteries have to be

recharged immediately.

The following formula determinates the battery capacity:

= ℎ ×

(where t

is indicated in hours)

disch

For temperatures different from the nominal (20°C) and

discharge rates between 3 to 10 hours, the battery

capacity shall be corrected as follows:

20°C

1 + λ ( θ − 20 )

Trending battery capacity during years will provide

information in predicting when the battery will no

longer meet design requirements.

Edition 03/2018 Rev.7

the

discharge

shall

disch

(V)

final

) × 0.2

ℎ

Where:

θ = initial pilot cell

temperature (°C)

λ= 0.006 for tests > 1 hour

λ= 0.01 for tests  1 hour

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