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KraftPowercon Sweden AB, Hjalmar Petris väg 49, S-352 46 Växjö, Sweden, Tel: +46 470-705200, Fax: +46 470-705201,
www.kraftpowercon.com
NOTE: If two temperature controlled direct current systems are connected (see “Double systems”,
section
4.4.4), the system that provides the highest voltage (measures the lowest temperature) will
determine the total system voltage.
4.4.2
Equalizing charging
4.4.2.1
General
Equalizing charging means charging with raised voltage level for a limited period.
For equalizing charging the “FAN” output is activated to start a battery compartment fan if
necessary. The output continues to be activated for an additional 60 minutes following a
completed equalizing charge to ensure the evacuation of explosive gases.
In certain circumstances, equalization charging may not occur. This could, for example, apply if
the flow guard in the battery compartment fan indicates a fault or if a load that cannot withstand
the raised voltage is connected. This is handled via the digital input “EQ. BLOCKED”. Open input
prevents equalizing charging.
All types of equalizing charging can always be stopped manually via a single press of a button.
Two different types of equalizing charging are available:
1.
Manual equalizing charging
2.
Automatic equalizing charging
WARNING:
Generally, batteries of VR-type (vent regulated) should not be subject to equalizing
charging. For some battery types equalizing charging could even be harmful to the batteries.
Always follow the instructions stated by the battery manufacturer.
4.4.2.2
Manual equalizing charging
Manuel equalizing charging means that you give a manual request to start equalizing charging
with a certain length. Equalizing charging starts immediately after the request and continues for a
specified period. See section
5.8.2.
4.4.2.3
Automatic equalizing charging
Automatic equalizing charging takes place following a mains power failure.
During a mains power failure, the time
(t)
is measured for the voltage remaining below a certain
level
(Level 1).
Equalizing charging starts when mains voltage has returned. From the time the
system voltage has reached
Level 2
, equalizing charging continues for a further period t * K, that is,
however, restricted to a max 24 hours.
The
Level 1, Level 2 and K
parameters are specified in the
Functions
menu, see section
5.13.6.
4.4.3
Battery circuit test
4.4.3.1
Simple battery circuit test
A simple battery circuit test is automatically carried out at optional intervals (normally once a day).
The test involves checking that the entire battery circuit, i.e. not only the battery block is in
working order.
The test is made over a short period of time (about 5 seconds) by lowering the voltage level of the
rectifiers to a test level. In order for the test to be approved, the system voltage must not drop
below the set alarm level over the period. The alarm that is initiated is the
Battery circuit fault.
An extra battery circuit test can be started manually. This manually started test works exactly as
above and is also based on the same parameters, see section
5.8.3.
