T-code Valid from serial number
403-414, 669-671, 716-718 713962-
Date Order number
2005-06-01 218920-040
38- 4 Service Manual REFLEX RR B/E, RR B/E CC © BT Europe AB
Battery charger – 8340
Functional description
38.3.6 Equalised charging
The function is only available in program version 1.19 or later.
The function charges 20% of the programmed battery capacity at the
earliest six hours after the end of the normal charge. The equalising
charge can only continue for five hours and only takes place once per
programming session. The function is erased after the equalising
charge is complete, and must be reprogrammed when the equalising
charge is required. The equalising charge is only used a few times per
year to counteract unequal cell voltage and sulphating.
38.3.7 Current and voltage characteristics
The charger’s direct voltage varies with the load and is 2.0 – 2.1 V/cell
at 100% current and 2.55 – 2.65 V/cell at 25% current. The voltage var
-
ies with the mains voltage and temperature.
38.3.8 Safety shutdowns
The computer switches off the main contactor if anything abnormal
occurs to prevent damage to the battery and other components.
Temporary shutdowns occur with:
• Incorrect mains voltage.
• Too high charging output.
• Too high temperatures.
Definite shutdown takes place and maintenance charging is connected
if the following occurs:
• Recharging capacity is too high.
• Charging with voltage over 2.37 V/cell, more than 6 hours, without
approved measurement values. The function “cold storage charg
-
ing“ (charging of cold batteries) permits 8 hours.
Shutdown takes place and maintenance charging is disconnected if:
• The battery is faulty.
• The charging current’s momentary value is higher than double the
rated current.
• The battery is disconnected without the mains switch being switched
off.
If the computer fails, charging is cut by a separate total time circuit after
12 hours without contactor connection.
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