Earthing; Electrical Connections - Grundfos ATEX Serie Instructions

6.3 Earthing

Caution
The servomotor must be earthed.

6.4 Electrical connections

Warning
Electrical connections may only be established by
qualified staff.
Observe the servomotor manufacturer's instructions
supplied with the servomotor.
Warning
Before opening housing, disconnect the servomotor
from the power supply.
Observe the local safety regulations. Protect the
cable connections and plugs from corrosion and
moisture.
Warning
The applicable regulations must be observed when
carrying out electrical installation and commissioning
work. When undertaking electrical installation and
commissioning work on explosion-protected
equipment, the relevant national regulations on
setting up electrical installations in potentially
explosive areas need to be taken into account too.
Warning
Protective measures must be put in place in
accordance with the relevant VDE guidelines and
power supply company regulations. In particular,
VDE guideline 0105, "Working on live installations",
must be taken into account.
Warning
All elements, such as switch cams, switches,
potentiometers, relays, etc., are wired at the factory.
The internal wiring must never be modified.
Warning
The terminals at the limit switches are live when the
switch closes.
Warning
The following must be taken into account for
explosion-protection servomotors and pumps.
Danger of explosion!
Only use high-strength cable glands appropriate for
the cable size.
Attach suitable caps to unused openings.
Switch cams and limit switches are set at the factory
Caution
and must not be modified.
Before connecting the mains cable, check whether
the type of current, the supply voltage and the
frequency stated on the type plate match the local
Caution
conditions.
An incorrect supply voltage may destroy the
servomotor.
To ensure electromagnetic compatibility (EMC), the
signal cables must be shielded.
The screen must be connected on one side to PE
Caution
(earth) or to the housing earth (earth terminal).
Lay signal and mains cables in separate cable
channels.
For parallel operation: If several drives are controlled
Caution
via a shared contact, every drive must be equipped
with a relay for parallel operation.
Lay the mains supply lines with cross-sections that
Note
conform to the relevant VDE guidelines.
Use separate, shielded lines for low voltages (e.g.
Note
potentiometers, analogue signals).
Use screwed cable joints appropriate for the
connection line.
Note
The stated degree of protection can only be ensured
if suitable screwed cable joints are used.
• Carry out the electrical connections according to the
servomotor manufacturer's instructions.
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