GA01300_0902 - 04/2006 - © by Leybold Vacuum
21
Installation
3.4.1
Pumps with EExe II T3 Motors
There are no reservations as to operation of the vacuum pump in explosion
hazard areas of outer ZONE 1 for substances of temperature classes T1 to
T3 and explosion group IIA and IIB when observing the conditions given in
the following:
The electric motor of the vacuum pump must be connected
through a suitable motor protection switch to the mains supply. If
the vacuum pump is supplied ready for connection, the motor
protection switch needs to be installed by the customer on the
vacuum pump and within a pressure-tight encapsulation.
The electric motor must be installed in accordance with the
accepted rules which apply to electrical systems in explosion
hazard areas. If required, detailed information on this is available
from the manufacturer.
In case of a failure relating to the vacuum, the vacuum pump must
be switched off automatically by interrupting the power supply.
Due to the measures introduced, the vacuum pump is
not
suited
for pumping explosive atmospheres (inner explosion protection). If
planning such an application please consult us first.
Fig. 8 Connection diagram for TRIVAC BCS with 50 Hz 3-phase motor
Delta connection
Star connection
Fig. 8a Double star - Connection for pumps with 190-220 V, 50 Hz and 190-240 V, 60 Hz motor (Part No. 154 50/51)
Warning
