LEYBOLD E 250 - 2.2 Electrical Connection Procedures

GA 02.200/8.02 - 10/02
Operation
9
2.2 Electrical Connections
For all work on the wiring, disconnect the
line cords from the mains.
The electrical connections must only be
provided by a trained electrician in accor-
dance with the regulations of the IEC 64
international series of standards.
Connect the pump's motor to the correct supply voltage
via the terminals in the junction box.
Only the PG fittings provided on the junction
box may be used.
For proper connection, a suitable motor protection switch
must be used.
Set the switch in accordance with the rating on the motor
nameplate.
After connecting the motor and every time
you alter the wiring, check the direction of
rotation (see marking on motor hood).
When connecting a condenser to the E 250
and DK pumps - without motor - it must be
ensured under all circumstances that a
speed of 1500 rpm is not exceeded and that
at least 5 kW of motor power is available.
When checking the direction of rotation, the inlet and
exhaust ports must be open. Switch on the motor briefly
and then switch it off immediately. If the reverse lock pre-
vents the pump from starting, disconnect the line cords
from the mains and interchange two of the input leads at
the motor junction box.
For checking the direction of rotation it is advisable to
use a phase-sequence indicator.
If the pump has a built-in SECUVAC valve, connect it so
that it closes when the pump is not running.
Warning
Caution
Fig. 6 Electrical connections
W 2
U 2
V 2
U 1
V 1
W 1
L 1
L 2 L 3
L 1
L 2 L 3
W 2
U 2
V 2
U 1
V 1 W 1
Y - Star connection
∆ - Delta connection
Caution