10
Operating Instructions – Explosion-Proof AC Motors DR63/eDR63, DVE250/280
2
Electrical connection
Safety Notes
Observe the notes in the "Mechanical Installation" section.
2.8
Electrical connection
All work may only be carried out by qualified personnel. During work, the low-voltage
machine must be at standstill, enabled, and safeguarded against accidental restart. This
also applies to auxiliary circuits (e.g. anti-condensation heating or forced cooling fan).
Check that the motor is de-energized!
Exceeding the tolerances in EN 60034-1 (VDE 0530, part 1) – v5 %, frequency
+2 %, curve shape, symmetry – increases the heating and influences electromagnetic
compatibility. Also observe DIN IEC 60364 and EN 50110 (and, if applicable, other na-
tional regulations, such as DIN VDE 0105 for Germany).
In addition to the generally applicable installation regulations for low-voltage equipment,
it is also necessary to comply with the special regulations for setting up electrical ma-
chinery in potentially explosive atmospheres (operating safety regulations in Germany:
EN 60079-14; EN 61241-14 and system-specific regulations).
Observe the wiring information and differing data on the nameplate as well as the wiring
diagram in the terminal box.
The connection should be a continuous secure electrical connection (no protruding wire
ends); use the cable end equipment intended for this purpose. Establish a secure pro-
tective earth connection. When the motor is connected, the distances between live and
conductive parts must not be shorter than the minimum values according to DIN EN /
IEC 60079-7 and -15 and national regulations. The minimum values according to the
respective standards must be observed, see the following table:
The terminal box must be free of foreign objects, dirt and humidity. Unused cable entry
openings and the box itself must be closed so that they are dust and water proof. Secure
keys for test mode without output elements. Assure yourself of the flawless operability
prior to starting up low-voltage machines.
Observe the notes in the "Electrical Installation" chapter.
2.9
Startup/operation
Whenever changes to normal operation occur, such as increased temperatures, noise,
vibrations, etc., try to determine the cause. Consult the manufacturer if required. Never
deactivate protection devices, even in test mode. Switch off the motor in case of doubt.
Regularly clean air ducts in dusty or dirty environments.
Nominal voltage V
N
Distance for motors in
category 3
(DIN EN / IEC 60079-15)
Distance for motors in
category 2
(DIN EN / IEC 60079-7)
≤
500 V
5 mm
8 mm
> 500 V to
≤
690 V
5.5 mm
10 mm