5.1 Battery Maintenance

First put the accumulators in operation as described in the Description and Installation section (PSTN Central Unit, Before You Start). Also, pay attention to them whenever the operation is interrupted and during replacement. The basic rules are as follows:

Interruption of Operation

The interruption of service means that LN is without a power supply for a rather long time. The battery is not being charged and can be damaged. This situation may occur in the following cases:

• In a building under construction or in an unused building where the power supply may be turned off for weeks or even months;
• While replacing the CU;
• At the end of a testing, exhibition or similar event.

In such cases, open the CU and remove the battery or disconnect it placing the transport tape between the battery contact and the holder contact.

List of Battery Endangering Situations

1. CU installation in an unfinished new building. Remember that the power may be switched off for weeks or even months in a building that has not been put in operation yet. If necessary, install the communicator here, check its function and remember to protect the batteries against depletion – remove them or disconnect using the transport tape. U nového typu HW stačí přepnout vypínač do polohy OFF. If the risk is not so high, just disconnect the green connector. Both the steps, however, may only be performed when the elevators are out of operation.
2. Excessively long storage periods. Make sure that your storage obeys the FIFO (first in first out) principle. If the end of the six-month storage period is approaching, you may recharge the batteries in the product (see above), replace the transport tape and continue storing the product. On new HW model, you have to switch the battery button into the position ON for charging. When are batteries full charged, then switch the battery button again into the position OFF.
3. Dismantling CU. If, for whatever reason (warranty claim, transport to service site in order to upgrade, etc.), you dismantle the CU, remember that the CU is still "working". This way it may be stored without recharging for no longer than 1 week, or, after having been fully recharged, no longer than 1 month. If there is a risk of exceeding this period, remove the batteries or disconnect them using the transport tape. With new HW model just switch the battery button into the position OFF before transportation.
4. Testing, exhibitions and presentations. If you operate the communicator for example at an exhibition, remember that the entire set may be disconnected from the power supply. In such case the batteries will discharge. Do not forget to recharge them as soon as possible, or – preferably – disconnect the green connector if you do not need to have the system on. With new HW model just switch the battery button into the position OFF before transportation.

Battery Pack Replacement

Battery Pack Service Life

• The warranty period does not apply to common wear and tear, i.e. the battery depreciation. If, however, the product is used normally, the battery service life is substantially higher than the warranty period.
• LN monitors the battery pack status and indicates the need of replacement upon a certain capacity drop.
• Where the dispatching office is equipped with the 2N^® LiftManager software, this information is automatically transmitted as an error message.

For replacement, four new Ni-MH accumulators of size AA and minimum capacity of 2000 mAh are needed. Make sure that accumulators of the same type and production series are used. You are recommended to use the batteries delivered in groups of four by the manufacturer. The recommended type is SANYO Eneloop 2000.

How to Replace a Battery

Instructions

1. Disconnect all supply cables from the CU.
2. Release the 6 screws on the CU bottom and remove the cover.
3. Replace the batteries and check polarity (the spring holder contact = minus pole of the cell, i.e. its flat end).
4. Replace the cover and tighten the screws into position.
5. Dispose of used battery packs in accordance with the applicable waste law. You can return them to the manufacturer too.