Electrical connection
6.1 Connecting the machine
1MB..1/2/3/4 - shaft heights 63 ... 355
Operating Instructions, 06/2020, A5E44455710A
71
● 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 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
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
) specified for
the relevant temperature class. Protect electrical machines for heavy duty starting
(acceleration time > 1.7 x t
E
time) according to the specifications of the EC-type
examination certificate using a function to monitor starting.
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 EU type examination certificate are recommended.
See also
Thermal protection (Page 43)
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 certified
sealing plugs.
● Please observe the manufacturer's specifications when fitting cable entries.
6.1.1 Terminal box
Electric motors have high voltages. When incorrectly handled, this can result in death or
severe injury.
Switch off the machine so that it is in a no-voltage condition before you open the terminal
box.
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