P2.x ATEX
Verify the pump motor has the correct voltage and frequency: Voltage tolerance ±5 %, frequency tolerance ±2 % - from rated
value.
Properly connect the sample gas pump per the respective wiring diagram (see below). If the wiring diagram inside the cover of
the terminal box is different, observe that instead. The required tightening torque for the nuts on the terminal board is 1.5 Nm.
Ensure the connecting cable has adequate cable relief. The clamping area of the cable gland is 6-12 mm. The required tightening
torque for the cable gland is 5 Nm.
The supply line and earthing cross-sections must be aligned with the rated current. Use a minimum line cross-section of
1.5 mm
2
.
Be sure to connect the following protective earth terminals to your on-site earth conductor per local regulations:
– Protective earth terminal inside the motor terminal box.
– Protective earth terminal on the outside of the motor housing.
– Protective earth terminal on the mounting bracket. (The earth bolt on the mounting bracket may alternatively be connected
to the protective earth connection on the outside of the motor housing via cable bridge.)
Stray electric currents may not flow through this connection.
No foreign objects, contaminants or moisture may be inside the junction box. Any unused cable gland openings must be sealed
with plugs approved for the application (if necessary Atex, IECEx).
To maintain the IP rating specified by the manufacturer, when sealing the terminal box with the cover ensure the original seal is
correctly seated and tighten the bolts at 5 Nm.
Be sure to observe any varying information in the rating plate. The conditions at the site must correspond with all rating plate
information.
Three-phase motors
Delta connection
lower voltage
Three-phase motors
star connection
higher voltage
AC motors
with
operating capacitor
15
Bühler Technologies GmbH
BE420002 ◦ 07/2022
