Electrical connection
6.2 Connecting the machine
1LA5/6/7/9, 1LG4/6, 1MA6/7, 1MB..1/2/3/4/5 - SH 63 ... 355
Operating Instructions, 06/2018, A5E44455710A
69
All cable entries and sealing plugs must be approved for use in the respective hazardous
zone.
● Any openings that are not being used must be sealed using the appropriate certifie
d
s
ealing plugs.
● Please observe the manufacturer's specifications when fitting cable entries.
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 t
he
t
emperature 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 explosion-protected machine according to EN / IEC 60079-14 Chapter
"Rotating electrical machines".
● For machines with type of protection increased safety "eb", select the overcurrent devic
e
w
ith current-dependent delayed trip so that the tripping time, which should be taken fro
m
t
he characteristic of the switch for the ratio I
A
/ I
N
of the machine to be protected, is not
longer than the safe locked rotor time t
E
. Take the ratio I
A
/ I
N
as well as the safe-locked
rotor time t
E
from the rating plate. Set the protective device to the rated current. Use a
tripping unit certified according to directive 2014/34/EU.
● For machines with increased safety "eb" type of protection, in the event of a locked rotor
the protective device must disconnect within the safe locked rotor time (t
E
time) specified
for the relevant temperature class. Protect electric machines used for heavy duty starting
(acceleration time > 1.7 x t
E
time - locked rotor time) by monitoring the starting 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.
Thermal protection (Page 43)
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