Noblift LPT22 Service Maintenance Manual Download

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used).

Slowly pour sulphuric acid into a container containing exclusive water(or distilled water), and churn

it up with an acid-resistant stick. Keep it still until the fluid temperature drops to 35

C, then it can be

poured into cells. The concentration of confected electrolyte is 1.280+0.005 (25

C ).

The conversion forrnula of electrolyte is: S

+0.0007*(t - 25)

which:
S

: The concentration of electrolyte in standard temperature of 25

: The actually measured concentration of electrolyte.

T: Actually measured temperature.
When confecting electrolyte, avoid pouring water into concentrated sulphuric acid, for fear that

sulphuric acid splashes and leads to physical injury. In addition, please wear protective appliance.



Wipe up the cells, check the nuts be tight for reliable connection.



Pour configured electrolyte into grouped batteries, with fluid level 15-20mm higher than protective

slice. Keep it still for 4-6 hours (maximum duration no more than 12 hours). Only when the cells
temperature drops below 35

C can it be connercted to DC and charge. If cell’s temperature exceeds

℃

, it should be taken to cool it down.



Check the cells in the battery for reverse polarity with DC voltmeter to assure proper

polarity.Connect the anode of the power supply to “+ “of the battery, the cathode of the power
supply to “-“ of the battery. Avoid reverse polarity for fear of reverse charging. The voltage of the
charge power supply should be higher than 1.5 times of the charged battery. When all the work is
properly done, the cells can be charged according to parameters outlined in the list below:

Charging current (A)

initial charge

common charge

Model

Phase 1 (0.5 I

Phase 2 (0.25 I

Phase 3 (0.7I

Phase 4 (0.35 I

210Ah 21

10.5

14.5

280Ah 28

350Ah 35



Initial charges are conducted in 2 phases: in phase1, when terminal voltages of the cells rise to 2.4V,

the current should be converted into phase2, and continue to charge until air bubbles come out from
the electrolyte, keep cell voltage(under constant current) steady for 3 hours. When the
concentration of confected electrolyte reaches 1.280

士

0.005, it should remain unchanged within 3

hours. At this moment, the total quantity of electric charge should be 4-5 times the rated capacity,
and the charging duration will be 70 hours.



If the concentration of the electrolyte is not 1.280

士

0.005, it should be adjusted. The method is: if

the concentration is too high, draw out some electrolyte and add some water or distilled water, until
the concentration equals to the prescribed value; if the concentration is too low, draw out some
electrolyte and add some pre-confected dilute sulfuric acid with a concentration of 1.400g/cm

, until

the concentration equals to the prescribed value. When the concentration of electrolyte is adjusted,
it should be charged for 1 hour for consistency. The density-ratio of electrolyte is as follows:

Concentration of electrolyte

Volumeratio of water to

sulfuric acid

Capacity ratio of water to

sulfuric acid

1.100 9.80:1 5.84:1
1.200 4.33:1 2.36:1
1.270 2.80:1 1.57:1
1.280 2.75:1 1.49:1
1.400 1.90:1 1.00:1