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tected by connecting the release or relay in series with
the phase windings. Selection and adjustment of the
releases must be based on the rated value of the phase
current (x0.58 rated current of the motor). If such a
connection is not possible, suitable protection switches
must be used, for example with phase failure control.
For polechanging motors current-dependent delayed re-
leases or relays have to be provided for each rotational
speed level that can be locked against each other.
For type of protection increased safety “e”
(“eb”) the starting will be controlled as well.
Therefore the protection device must switch
off within the time period t
E
that is given for
the corresponding temperature class when
the rotor is blocked. The requirement is
fulfilled if the release time (it can be taken
from the release characteristics (starting
temperature 20°C) for the ratio I
A
/I
N
) is not
higher than the indicated t
E
time.
Electrical machines of type of protection increased
safety “e” (“eb”) for heavy starting (start-up time >
1,7 x t
E
time) must be protected by a starting control
according to the information of the certificate of confor-
mity. They have to be certified accordingly.
Thermal motor protection by means of direct
temperature monitoring of the winding is
permissible if this is certified and indicated
on the name plate. The protection consists
of thermo couples according to DIN 44081/
44082 that ensures explosion protection
together with a tripping device with type of
protection marking
II (2) G. For pole-
changing motors it is necessary to have
separate protection devices for each rotation
speed level, that can be locked against each
other.
Auxiliary devices
Explosion-protected motors can be equipped with diffe-
rent auxiliary devices as option:
Additional thermal motor protection
For monitoring the stator winding temperature it is pos-
sible to have thermo couples installed in the motor (PTC
thermistors, KTY or PT100). For their connection suita-
ble auxiliary clamps for auxiliary circuits are available
in the main terminal box or in additional terminal boxes.
The connection is done according to the attached
connection diagram.
Thermal motor protection as inherent protection
The use of thermal winding protection as inherent motor
protection is only permissible if the operation is tested
separately and certified by a notified body. On the name
plate instead of the t
E
time a t
A
time is marked.
In addition the following text will be printed on the name
plate: “operation only with tested PTC tripping device
and marking
II (2) G”.
“Do only operate with approved PTC-Ther-
mistor-Relays with indication
II (2) G”.
Anti-condensation heating
The heating tapes must comply with the directive
2014/34/EU (RL94/9/EC). The heating power and the
input supply voltage are indicated on the name plate
of the motor. For their connection either in the main
terminal box or in the auxiliary terminal boxes suitable
clamps for auxiliary circuits are provided. The connec-
tion is done according to the attached connection dia-
gram. The anti-condensation heating has to be switched
on only after disconnection of the motor. It shall not be
switched on while the motor is in operation.
Forced ventilation unit
The fans must comply with the directive 2014/34/EU
(RL94/9/EC). The forced ventilation unit is dissipating
the lost heat at operation of the main motor. During
operation of the main motor the motor of the forced
ventilation unit has to be switched on. After discon-
nection of the main motor the forced ventilation has to
continue depending on the temperature. For motors with
forced ventilation units that are dependent of the sense
of rotation, the sense of rotation has to be observed
unconditionally (see rotation mark). Only manufacturer
approved forced ventilation units shall be used. The
forced ventilation unit has to be connected according
to the connection diagram that is supplied inside of the
terminal box.
Special design for terminal box on N-side
The terminal box for this special design is located on
N-side of the motor before the fan cover. To realise this
design the stator housing was turned during production.
Special marking for type designation:
KNS…
for sizes 56 to 132..T
(VEM motors Thurm GmbH)
KN …
for sizes 112 to 400 (VEM motors GmbH)
For motors of category 2 a special approval is neces-
sary.
Fitting with RFID transponder (Memory motor)
As option it is possible to equip the motor with an RFID
transponder (TAG). This feature is called memory motor,
marked with “MM” according to factory standard
EW-N 1002, page 13. The transponder D14-TAGspecial
ATEX (RFID System iID®2000, 13.56 MHz based on
ISO 15693 is used.
The reading of the data may be carried out in
areas with an explosive atmosphere only
with a reader approved in accordance with
Directive RL 2014/34/EU (Directive 94/9/EC).
External heat and cooling sources
No extra measures will be necessary for existing exter-
nal heat and cooling sources, if the temperatures at the
installation site are not exceeded. If the temperatures
are exceeded or impacts on operational temperatures
or maximum surface temperatures can be expected
provisions will have to be made to maintain and confirm
explosion protection. If in doubt please contact the
manufacturer.
