162 25. Routine maintenance – Programming Manual
25.3.
Fans replacement
Warning
The P7 units installed in 3HE racks with sealed case are fitted with two
fans: one inside the case and one inside the P7 rack.
We advise replacing the fans once every 50,000 working hours
(assuming average operating conditions at 40°C).
The fans must be replaced by authorised personnel only (Marposs or
Customer personnel).
Fan located inside the case
Fan located inside the rack
25.4.
Data back-up batteries
The programming data of the sets are stored by the equipment onto memory chips.
These electronic devices need to be powered even when the equipment is switched
off in order to keep the data stored. The P7 is powered through accumulators that are
recharged every time the equipment is switched on. The use of rechargeable
accumulators instead of batteries was developed according with the reduction of both
polluting waste materials and maintenance times. Actually the batteries involve
expenses for disposal and require a preventive maintenance (replacement every 6
months) to prevent loss of acid.
The P7 unit is supplied with charged accumulators. The accumulators used
guarantee that the data are stored, with the equipment switched off, for 12 months in
an environment with temperatures ranging between -20 and 35 °C. In case of
temperatures exceeding 35 °C or lower than -20 °C the data retention time can be
remarkably lower.
If the unit is not used for a few weeks (4 - 6) we suggest to keep the equipment
on for at least a workday (8 consecutive hours).
In case of complete loss of the accumulators charge level the unit must be kept
continuously switched on for 40 hours to restore the accumulator charge.
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