5. Remarks of manufacturer
5.1. Maintenance, inspections, repairs
The device implements programmed operation of protection, control and automatic functions algorithms,
and it was fitted with autotest systems responding to internal damage during device operation.
The manufacturer recommends that correctness of device operation is verified:
a) each time - during commissioning,
b) at least once a year - in mine face installations,
c) at least once every 5 years in installations other than front face.
The following are subject to periodic inspections (if used):
correct operation of measurement channels of phase currents and voltages, earth-fault currents
and voltages, at rated values;
correct operation of control circuits;
correct operation of measurement channels of PT100 temperature sensor; one-point check may be
carried out; with an external 100 Ω±0,1% resistor indicated temperature should be 0°C.
correct operation of 4...20 mA measurement channels; verification check can be carried out at one
point, with preset measuring current, e.g. 10 mA.
correct operation of communication channels, in line with the implemented protocol;
integrity of device protection earthing.
It is recommended that the internal battery is replaced at least once every 10 years. The battery should be
replaced by service personnel as indicated by manufacturer.
Differences observed during checks, or in measurement readings, or in device operation, should be notified
to the service center as indicated by manufacturer.
Also inspections resulting from branch regulations should be undertaken.
Changes in protections set points during operation do not require verification of their correctness.
5.2. Storage and transport
Devices are packed in transport packages and secured against damage during transport and storage. Devices
should be stored in transport packages, indoors, in places free from vibrations and direct effects of weather
conditions, dry, well ventilated, free from harmful vapors and gases. Ambient air temperature should be
between –55°C and +70°C, and relative humidity should not exceed 80%. All shipped devices are attached
with complete set of connectors, grounding braid, warranty card and quality certificate.
5.3. Place of installation
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