10
Operating Instructions – Explosion-Proof AC Motors – DRS/DRE/DRP 315
2
Electrical connection
Safety Notes
2.7
Electrical connection
All work may only be carried out by qualified personnel. During work, the low-voltage
machine must be on standstill, enabled, and safeguarded against an accidental restart.
This also applies to auxiliary circuits (e.g. anti-condensation heating).
Check that the motor is de-energized.
Exceeding the tolerances in EN 60034-1 (VDE 0530, part 1) – v 5%, frequency
+ 2%, curve shape, symmetry – increases the heating and influences electromagnetic
compatibility. Observe nameplate data and the wiring diagram in the terminal box.
Pay attention to the wiring information and different data on the nameplate, as well as
observing the wiring diagram.
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 to non-insulated
and live parts must not be shorter than the minimum values according to EN 60079-15
and national regulations. With low voltage, the distances should be no shorter than the
following values, in compliance with EN 60079-15:
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 chapter "Electrical Installation" (see page 17)!
Rated voltage V
N
Distance
≤
500 V
5 mm
≤
690 V
5.5 mm
