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8. Electrical connection
Protection and control functions
Level controllers
To prevent air intake, dry running and vibrations,
install the stop level switch in such a way that the
pump is stopped before the liquid level falls below
the upper edge of the pump’s clamp.
Switches and sensors
Explosion-proof pumps are assembled with a
WIO sensor optionally.The sensor measures the
water content from 0 to 20%. It also sends a signal if
the water content is outside the normal range
(warning), or if there is air in the oil chamber (alarm).
The pump must not run dry. Dry running
can cause ignition hazard.
Install an independent secondary level
switch to ensure that the pump is stopped
in case the primary stop level switch is not
working.
DANGER
Electric shock
Death or serious personal injury
- Connect the pump to an external main
switch which ensures all-pole
disconnection with a contact separation
according to EN 60204-1. It must be
possible to lock the main switch in
position 0. Type and requirements as
specified in EN 60204-1. The electrical
connection must be carried out in
accordance with local regulations.
The pumps must be connected to a control
box with a motor protection relay with IEC
trip class 10 or 15.
Power supply for motor protection circuit
must be low voltage, Class 2.
See motor protection wiring diagram in
section 8.1 Wiring diagrams.
TM06 5988 0216
Pumps for hazardous locations must be
connected to a control box with a motor
protection relay with IEC trip class 10.
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