Flameproof motors | 35
EX ATMOSPHERE INFORMATION
Pay attention to minimum insulation
distance between terminals or
clamps when making the connection
in terminal boxes with protection Ex
e.
Before closing the terminal box, make sure all
terminal nuts and grounding connections are duly
fastened. Also make sure that all lead outlets
sealing that are certified are in perfect conditions
and installed correctly.
EX ATMOSPHERE INFORMATION
Any opening not used must be
closed with certified plugs
accordingly to the motor certification.
5.2.4. PROTECTIONS
5.2.4.1 WINDINGS PROTECTIONS
As standard the Low Voltage motors are supplied
with thermal protectors PTC, one per phase (triple
set) connected in the main terminal box.
The Medium Voltage and High Voltage motors are
supplied with temperature detectors Pt100, two per
phase (3 wires) connected in the auxiliary terminal
boxes, for just measurement of the temperature, or
either, to monitor the temperature in overload case,
sub-voltage or fan fail, etc.
Under request the motors can be supplied with
temperature detectors with certification “Ex e”
and/or “Ex i” connected to the auxiliary terminal box
through the interior of the motor. The references of
the respective certificates must be considered.
Table 5-10 - Windings thermal protections
5.2.4.2 BEARINGS PROTECTIONS
As standard the Medium and High voltage motors
are supplied with one Pt100 per bearing (3 wires)
connected in the auxiliary terminal box. Under
request the motors can be equipped with
temperature detectors with certification ATEX
and/or IECEx with protection “Ex e” and/or “Ex i”.
The thermal protectors are connected directly to
the motor terminal boxes or to connection heads
with ATEX and/or IECEX certification mounted in
the motor endshields. The references of the
respective certificates must be considered.
EX ATMOSPHERE INFORMATION
When the motors are equipped with
thermal protectors (Pt100,
thermocouples) with Intrinsic Safety
Protection (Ex i), the safety parameters
of the measurement or monitoring
system connected to these devices
should be in accordance with the
certificates of the thermal sensors and
should have the same protection.
The connectors for intrinsic safety (Ex i) circuits are
separated from the connectors of circuits which are
not for intrinsic safety and are in blue color to be
distinguished from the non intrinsic safety circuits.
When the motor is equipped with Intrinsic Security
(Ex i) components, the input parameters of these
components are supplied with the motor
Instructions Manual, to define the Zener barrier of
Intrinsic Safety Security.
The cables are taken from the motor terminal box
to a temperature detector which must be installed
in control panel.
When requested by the customer for special
application conditions, motor can also be supplied
with several thermal sensors for winding and/or
bearing protections and others.
The temperature of the Pt100 calibrated resistance
may be calculated with the formula given below:
R = Resistance measured in the Pt100 in Ω (Ohm).
T = Temperature in ºC.
WEG recommends the connection and control of
all installed thermal probes. The maximum setting
temperatures in W22Xd standard motors shall be
as follows:
Table 5-11 - Temperature values for alarm and tripping
Winding
Rib-cooled motors
Winding
Tube-cooled motors
Alarm and tripping values can be defined based on
the application, however, that can not exceed the
above table.
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