Westfalia OSD 6-91-067, Instruction Manual

Page: 76 / 206

Westfalia Separator
76
Mineraloil Systems GmbH
2058-9001-101 / 0506
4.1.3 Motor
Rated current %
Separation Separation
W
aitin
g
Fig. 75 Start-up diagram (current and speed characteristics)
at
50 Hz 60 Hz
50 Hz 60 Hz
rpm min s kW
De-
sign
Enclo-
sure
*
rpm rpm
IP 55
see name-
plate
approx. 2 -
4
2 4 4.8 IM
V1
ISO-
class
F *
3 000 3 600
* WS standard
The separator is driven by a three-phase AC motor via a centrifugal clutch and
the drive belt.
The specified motor ratings are minimum values which are based on the in-
creased starting current. Since the current consumption of the motor drops after
start-up, overloading of the motor during operation is not possible.
The starting time depends on the
– flywheel effect of the bowl,
– number of clutch shoes used,
– condition of the clutch shoes.
The starting current can peak at about 1.8–2 times the rated current (see start-
up diagram). This is to be considered when selecting switches, lead-in wires
and fuses.
The motor
– can be started direct on-line,