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
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