DataSafe 12HX505 Anweisungen für Installation, Betrieb und Wartung - Seite 3

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Cells in Parallel Strings

When utilizing a constant voltage charger, ensure that the connections from the

charger at the end of each string have the same electrical resistance.

To reduce the risk of current imbalance, the number of parallel strings in any

system should be limited to five.

Charging

Float Voltage

■ ■

The float/charge voltage is 2.265 VPC at 77°F (25°C).

When the average ambient temperature deviates more than ± 9°F (5°C) from the

reference, it is necessary to adjust the float voltage as follows:

2.33 to 2.36 VPC at 32°F (0°C)

2.30 to 2.33 VPC at 50°F (10°C)

2.27 to 2.30 VPC at 68°F (20°C)

2.25 to 2.28 VPC at 77°F (25°C) (reference)

2.23 to 2.26 VPC at 86°F (30°C)

2.22 to 2.25 VPC at 95°F (35°C)

Due to the phenomena of gas recombination, a difference of ± 2% (earlier

in float life ± 5% is common) for an individual cell voltage can be observed.

However, the total voltage of the battery shall be within the limits stated above.

Fast Recharge

■ ■

Occasionally (4 or 5 times a year) the battery may be recharged at 2.40 VPC

with a current limited to the values listed in the Table 1. This charging should not

be allowed to continue for more than 16 hours.

Ripple Current

■ ■

Unacceptable levels of ripple current from the charger or the load can cause

permanent damage and a reduction in service life. It is recommended to limit the

continuous ripple current to the values of the Table 1 (in amperes).

DataSafe

Maximum charging

Battery Model

current (A)

12HX205

11.0

12HX300

18.0

12HX330

21.0

12HX400

24.0

12HX505

30.0

12HX540

31.0

6HX800

50.0

Charging Current

■ ■

The recommended charging method for DataSafe HX batteries is current

limited, constant voltage charging. Refer to Table 1 for the current limits for each

battery model.

State of Charge

■ ■

The battery state of charge can be determined approximately by measuring the

open circuit voltage after the battery has been at rest for a minimum of 24 hours

at 77°F (25°C).

State of charge

100%

80%

60%

40%

20%

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Discharging

■ ■

The end of discharge voltage must be limited to 1.60 VPC.

A protecting system shall have to be installed to prevent deep discharge.

■ ■

DataSafe

supplying the load, but must be immediately returned to float recharge mode.

Failure to observe these conditions may result in greatly reduced service life and

unreliability.

■ ■

When the battery is completely discharged, the sulfuric acid is completely

absorbed and the remaining electrolyte consists only of water.

At this point, the sulfation of the plates is at its maximum, considerably

increasing the cell's internal resistance.

Important notice: This type of deep discharge will provoke a premature

deterioration of the battery and a noticeable effect on life expectancy.

■ ■

Correction factor of the capacity, according to temperature.

Max recommended rms value

Maintenance and Records

of the alternating component (A)

2.0

DataSafe HX batteries are maintenance free, sealed, lead acid batteries and

3.5

need no water addition. These batteries are equipped with self-resealing,

3.5

flame-arresting safety vents.

4.2

The containers and lids shall be kept dry and free from dust. Cleaning must be

done only with a damp cotton cloth. Check monthly that total voltage at battery

5.0

terminals, while on float, is (N x 2.24 to 2.27 V) for a temperature of 77°F (25°C),

5.0

(where N is the number of cells in the battery).

8.5

Every 12 months, read and record the following:

Table 1

■ ■

Keep a logbook to record values, power outages, discharge tests, etc.

An autonomy check can be carried out once or twice a year.

The above record taking is the absolute minimum to protect the warranty. This

data will be required for any warranty claim made on the battery.

Voltage

2.12 to 2.14 VPC

2.09 to 2.11 VPC

2.05 to 2.08 VPC

2.01 to 2.04 VPC

1.97 to 2.00 VPC

Table 2

End of Discharge Voltage

Discharged Cells

HX batteries must not be left in a discharged condition after

Accidental Deep Discharge

The Effect of Temperature on Capacity

Time of discharge

41°F (5°C)

50°F (10°C)

59°F (15°C)

68°F (20°C)

77°F (25°C)

86°F (30°C)

95°F (35°C)

104°F (40°C)

Individual cell or battery voltages (in volts)

Cell-to-cell connection resistance (in ohms)

Terminal connection resistance (in ohms)

Ambient temperature in the immediate battery environment

Publication No: US-HX-IOM-004 - September 2012

1 min to 60 mins

0.84

0.88

0.93

0.97

1.00

1.03

1.05

1.07

Table 3