Hoyer HMA2, Manual

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4
Motor
Manual
2 Ex nA/ec and tc motors
Below information is a special note for Ex nA/ec and tc mo-
tors .
Designation of motors is according to EN/IEC standard: II 3D
Ex tc IIIB T120°C Dc and II 3G Ex nA/ec IIC T3 Gc . The motors
must only be connected to certified Ex relays . The hazard-
ous 3-phase asynchronous motors are in accordance with
EU directive 2014/34/EU and international standards EN/IEC
60079-0, EN/ IEC 60079-07, EN/IEC 60079-15 and IEC 60079-
31 . Only one electrical installation may be installed in one
specified area(zone) . For Ex ec parameter Time E must be
taken into account .
2 .1 Cable glands and connection
Only Ex certified cable glands may be used . Unused glands
must be closed by Ex certified blind caps .
When connecting, make sure that a permanently safe elec-
trical connection is maintained, both for the main supply
and earth connection . Installations must be in accordance
with actual standards for installation in hazardous area .
2 .2 Maintenance and spare parts
The user is responsible for changing parts in accordance
with life time of arts, in particular: bearings, grease and lu-
brication of shaft sealings . Installation, maintenance, repair
and replacement of parts in this type of motors must only
be carried out by qualified specialists according to EU di-
rective 99/92, EN/IEC 60079-14, EN/IEC 60079-17 and EN/IEC
60079-19 .
It is recommended that the IEC standard is followed ac-
cording to the temperature and dust on the motor surface .
Surface dust must not cause increase of motor tempera-
ture . Regularly cleaning is recommended . The radial shaft
sealing ring is part of the EX certification . It is important
that the sealing rings are intact . The shaft sealing must be
checked regularly, and if it is dry it must be lubricated . It
is recommended that the motors are re-lubricated regular-
ly . When replacing seal rings, use original ones . Replacing
bearings also means replacing the seals . All machines must
be inspected regularly for mechanical damage .
2 .3 Frequency converter operation
For converter use, PTC has to be connected and only for
quadratic torque application, in frequency range 20-60Hz,
switching frequency
≥ 2000 Hz and Inverter output du/dt ≤
1350V/0,8µs by reinforced winding du/dt ≤ 1560V/0,5µs