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Electrical connection
The following features make this type of electrical connection different from that for
standard machines:
● For machines marked with Zone A, maintain area A in EN / IEC 60034-1 (VDE
0530-1) (±5 % voltage or ±2 % frequency deviation, waveform, line supply
symmetry) so that the temperature rise remains within the permissible limits.
● Larger deviations from the rated data may result in electrical machines heating up
to impermissible levels. This information must be specified on the rating plate.
Under no circumstances exceed the limits!
● Protect every machine with type of protection increased safety "e" or protection
afforded by the enclosure "t" in accordance with EN / IEC 60079-14 against an
inadmissible temperature rise using a current-dependent, delayed circuit breaker
with phase failure protection and asymmetry detection corresponding to
EN / IEC 60947 or using an equivalent device in all phases.
● For machines with type of protection increased safety "e", select the overcurrent
device with current-dependent delayed trip so that the tripping time, which should
be taken from the characteristic of the switch for the ratio I
be protected, is no longer than the safe-locked rotor time t
as well as the safe-locked rotor time t
device to the rated current. Up to April 19, 2016, use a tripping unit certified to
Directive 94/9/EC - and from April 20, 2016, Directive 2014/34/EU.
● For machines with increased safety "e" type of protection, in the event of a locked
rotor the protective device must disconnect within the t
relevant temperature class. Protect electric machines used for heavy duty starting
(acceleration time > 1.7 x t
process using suitable equipment corresponding to the data provided in the EC or
EU type examination certificate.
Direct monitoring of the winding temperature is permissible as a means of thermal
machine protection, provided that this is certified and specified on the rating plate.
● With pole-changing machines, separate, interlocked protective devices are
required for each speed step. Equipment with EC or EU type examination
certificate are recommended.
108
from the rating plate. Set the protective
E
time - locked rotor time) by monitoring the starting
E
/ I
of the machine to
A
N
. Take the ratio I
E
time specified for the
E
Explosion-protected machines
56100000002002, 01/2016
/ I
A
N
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