12.1 Maintenance Procedures in the Power Supply Area
Replacement of the power supply module must be carried out by trained
personnel, and the power supply voltage must be turned off while the work is
being performed.
DANGER
Always turn off the power supply voltage before removing a hardware
module.
The power supply must be turned off for at least 5 s before power supply
module V is removed.
Otherwise there is the danger of an electric shock.
WARNING
The following instructions apply to surface-mounted cases:
The local control panel is connected to processor module P by a plug-in
connecting cable. Remember the connector position! Do not bend the
connecting cable.
NOTICE
The replaced power supply module must be disposed of in compliance with
applicable national regulations.
In general, the electronic components used for the device family Easergy MiCOM
30 are designed for a long service life.
For the power supply, however, dimensioning requirements dictate the use of
electrolytic capacitors that are subject to increased wear and tear. The useful life
of these capacitors depends on their temperature and thus on the components
fitted in the device, the load conditions, device location and environmental
conditions.
The internal voltage levels are cyclically checked by the P30 self-monitoring
functions. In case the voltage levels deviate from their specified values a warning
message will be issued or, for persistent problems, the device will be set to a
safe condition (blocking). Hence, there is no imperative need to replace the
power supply module after a pre-defined period of time. However, should you
need to guarantee a high availability of the device then we recommend
preventive replacement of the power supply module after a period of 8 to 10
years.
Moreover, the power supply module of the P634 is equipped with a lithium
battery for non-volatile storage of fault data and for keeping the internal clock
running in the event of failure of the auxiliary power supply. The useful life of the
lithium battery depends on the auxiliary power supply of the device.
P634
12 Maintenance
12-2 P634/EN M/R-42-A // P634‑311‑653
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