Battery Discharge Indicator - Linde E25 Service Training

Section 2.6
Page 78
2.6.10.2

BATTERY DISCHARGE INDICATOR

The battery discharge indicator consists of 10 LEDs (7 green, 1 orange and 2 red). Depending on the battery
state of charge, the row of illuminated LEDs goes off from battery fully charged (right green LED) to battery
discharged (both red LEDs flashing). When the two red LEDs flash, the speed of the working hydraulics is
reduced by 50 %.
The condition of a battery is always reflected in its discharge voltage gradient. In the case of the Linde
discharge indicator, the battery voltage is measured and from this value the voltage of the cells is deduced.
The cell voltage drops as the battery discharges. The cell voltage is also influenced by the momentary current
consumption. The surge in cell voltage with a load is lower with a charged battery than with a discharged
one. The registration of battery discharge is based on the voltage surges measured over a period of time.
The discharge voltage gradient varies with the type, age and discharge period of the battery. Various
discharge characteristic curves are stored in the operating software of the combined instrument for various
types of batteries. The correct curve must be chosen for the battery installed. The battery type can be modified
with menu item 21.
1 Standard wet cell Varta (factory setting)
2 Standard wet cell Deta
3 Performance enhanced battery
4 Gel battery
The discharge period and the age of the battery also affect the discharge characteristic. The programmed
discharge characteristic can be shifted in certain ranges in order to show the correct discharge information
on the display.
When the battery discharge reaches 80 percent, the speed of the working hydraulics is reduced to warn the
operator that the battery must be charged. This value can be increased to a residual capacity of 40 percent.
Depending on the type of application and battery, the discharge indicator must be optimised. An optimisation
is done with the diagnostic unit using the following menu items:
21 Battery type
22 Upper discharge characteristic
23 Cut-out point
The changes should be done in the smallest possible steps. The installed battery type should be programmed
first. Then a fine adjustment can be performed with menu item 22 (upper discharge characteristic), which
corresponds to the adjusting potentiometer (range A to E) on the Curtis discharge indicator, and with menu
item 23 (cut-out point).
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