Emcee 1004156, User Manual

Page: 43 / 66

Technical data 3-phase motors-English Rev.1.1 - 31-12-2005
AC INDUCTION THREE-PHASE MOTORS
Installation at altitudes of more than 1000 m above sea level (see also EN 60034-1)
Altitude of installation 2000 m 3000 m 4000 m
At 40°C ambient temperature and thermal class B
Rated output reduced to approx.
92 % 84 % 76 %
At 40°C ambient temperature and thermal class F
Rated output reduced to approx.
89 % 79 % 68 %
Full nominal output to data tables with thermal class B
and ambient temperature of
32° C 24° C 16° C
Full nominal output to data tables with thermal class F
and ambient temperature of
30° C 19° C 9° C
Starting rate
The permissible number of starts per hour can be taken as given in the table below, provided the following conditions are
met:
Additional moment of inertia ≤ moment of inertia of the rotor: load torque rising with the square of the speed up to nominal
torque; starts at even intervals.
Permissible No. of starts per hour for 2p Shaft height
= 2 = 4 ≥ 6
56 - 71 100 250 350
80 - 100 60 140 160
112 - 132 30 60 80
160 - 180 15 30 50
200 - 225 8 15 30
250 - 315 4 8 12
In case a doubt for your application please consult EMCÉ, indicating
the complete operating conditions.
Ventilation
The distance between air intake of the motor and walls or other
machinery must be at least 1/4 of the diameter of the air intake opening
(not applicable for totally enclosed non ventilated motors). Cooling
airflows from the non-drive end towards the drive end. Air leaving the
motor must not be drawn in again by the fan. Keep air inlets and outlets
clean.
Connection
Choose cable cross-sections in accordance with the rated current. Not used cable entries must be closed by
compression glands.
The supply cables must be connected with special care to ensure permanent and reliable contact (without loose cable
ends); use suitable terminals for the connection cables.
Supply cables must be stress-relieved so that no cantilever loads are exerted on the terminals.
Ensure a good connection of the protective conductor.
Make sure that no foreign matter is left in the terminal box, and that it is clean and dry. Cable entries which are not used
and the terminal box itself have to be sealed dust and water-tight. In order to maintain the degree of protection, always
make sure that the original gaskets are used when closing the terminal box.