FAQ Luznor

The chargers are single-phase with a shielded mains isolation transformer and a semi-controlled diode and thyristor bridge. This technology ensures high reliability and long life. 

Yes, typical examples are mains supply voltages other than 230 Va.c., different output voltages or number of battery elements, optional measuring devices, etc.

Any special requirements can be submitted to Luznor, whose technical department will be pleased to provide the most suitable solution. 

No. The output voltage is the voltage of the battery, the voltage of which depends on its state of charge, temperature, etc. In case of discharge the final voltage will be of the order of 1.10 V/e for Ni-Cd and 1.75 V/e for sealed lead. In charge the voltage will be of the order of 1.50 V/e in Ni-Cd and 2.27 V/e in sealed lead. 

Yes, the charger will provide its full rated current and the remainder will be provided by the battery, which will of course discharge. The battery will recover its lost capacity when the peak current ceases. 

By default all local alarms trigger the remote alarm after timing. However, it is easy to select that some do not. This should be requested to Luznor for proper configuration or procedure.

Any default that is detected and signalled locally on the unit's synoptic is transmitted remotely after a 10 to 20 second time delay. 

For this transmission, there is a potential-free changeover contact of a relay, which is wired to the internal terminals of the equipment and is available to the user. 

Ni-Cd batteries are more wear resistant, reliable and durable than sealed lead-acid batteries, making them the first choice for equipment where high reliability and long life are required. 
They provide high peak currents. They withstand full discharge and maintenance under full discharge conditions for weeks at a time. They also withstand high temperature conditions better. Their end of life is usually gradual, with a progressive loss of capacity. 
Their main disadvantage is their higher price and that their use is restricted to capacities of the order of 24 Ah maximum. 
When a higher capacity is required, sealed lead-acid batteries are normally used. There are different qualities of this type of battery. Luznor uses batteries with a design life of 10 to 12 years, but these are only available from a minimum capacity of around 18 Ah. 
Sealed lead-acid batteries cannot be fully discharged and cannot be maintained in a discharged state. For this reason, the equipment that uses them has a contactor at the output that cuts off any discharge as soon as it detects that the battery is discharged. Their end of life is usually quite abrupt and often without warning. 

Basically, two types of batteries are used:
    • Nickel-cadmium, watertight, cylindrical, maintenance-free, which are assembled in blocks of up to 10 elements, called flasks. 
The typical voltage of an element is 1.2 V and its capacity is 1.5 Ah to 7 Ah. Higher voltages and capacities are achieved by mounting elements in series and/or in parallel. 
    • Lead-acid, watertight, maintenance-free. 
Typical single-element voltage is 2 V and they are usually assembled in blocks of 6 elements (12 V). Higher voltages and capacities are achieved by mounting 12 V blocks in series and/or in parallel. 

The CB equipment provides continuous current at its output, both when there is mains voltage and when there is no mains voltage. There is no discontinuity in this voltage at the moment of mains failure or return. 
The CBQ equipment provides alternating current at its output when there is mains voltage and direct current when there is no mains voltage. There is a small voltage cut in the transitions from AC to DC output and vice versa. This equipment is mainly designed for loads that support both AC and DC voltage, such as incandescent lamps.