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We recommend that you connect the electrical supply to the motor through a starter or
circuit breaker which has thermal over‑current protection which can be adjusted to suit
the full load current ratings shown in
17. The fuse ratings in
provided for guidance only. The supplier of the thermal over-current protection device
may specify different values to ensure correct operation of the fuse and the over-current
protection device. Ensure that the fuse used is suitable for the starting currents given in
Table: Electrical data: three-phase motors on page
Refer to
or
Figure: Three-phase motors: 380-415 V 50 Hz and 460 V 60 Hz on page 29
appropriate for the correct electrical supply connection diagram for the motor.
The diameter of the outer sheath of the electrical cable must be in the range 10‑14 mm.
The cable must conform in size and colour coding with the local and national electrical
installation regulations. The temperature rating of the cable must be 70 °C or greater.
1.
Remove the cover from the motor terminal-box.
2.
Remove the cable-gland from the inside of the terminal-box and fit the cable-gland
to the cable lead-through hole in the side of the terminal-box. Using a tool this
should be tightened to a torque of 3.75 Nm.
3.
Refer to the electrical supply connection diagram for the pump. Make sure that the
metal links are connected as shown; if they are not, move the links to the positions
shown.
4.
Pass the electrical supply cable through the cable-gland and connect to the
appropriate terminals. Tighten the earth (ground) terminal connection to a torque
of 2.13 to 2.87 Nm.
5.
Tighten the dome shaped nut on the cable gland until the outer sheath of the
cable is firmly gripped. Using a tool this should be tightened to a torque of 2.5 Nm,
do not overtighten.
6.
Ensure that the gasket seal for the terminal box cover is correctly positioned, then
refit the cover to the terminal-box and secure with the screws.
4.7.2 Check the direction of rotation
CAUTION:
Ensure that the pump‑motor rotates in the correct direction. If it does not, the pump
and your vacuum system can become pressurised.
1.
With the pump inlet still unconnected, watch the motor cooling‑fan through the
motor fan‑cover.
2.
Switch‑on the electrical supply to the motor for a few seconds and switch off.
3.
Check that the motor cooling‑fan rotates in the direction shown by the arrow on
the motor mounting‑plate. If the direction of rotation is incorrect:
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A34310880_T - Installation
Table: Electrical data: three-phase motors on page 17
Figure: Three-phase motors: 200-220 V 50 Hz and 200-230 V 60 Hz on page 28
Isolate the pump from the electrical supply
Remove the terminal‑box cover and swap wires L1 and L3. Refer to the wiring
diagram supplied in the motor terminal box
Refit the cover to the terminal‑box
Connect the pump to the electrical supply
Table: Electrical data: three-phase motors on page
17.
Page 27
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