300598802_002_C0 - 10/2016 - © Leybold 19
Installation
3.4.2 Pump with Three-Phase AC Motor
TRIVAC
®
T pumps with three-phase motor are supplied without accessories
for electrical connection. They must be connected via the appropriate cable,
and a suitable motor protection switch.
If motor protection switch OFF, the motor shut down at once and don’t restart
automatically. After the motor protection is switched ON manually, the motor
can restart automatically on its own. In any case of maintenance either the
mains plug has to be disconnected or the motor protection has to be switched
OFF before starting with any work on the pump. After the necessary work, the
power supply can be rebuilt again.
When operating the unit at its operational limits (at an ambient temperature of
12 °C and at undervoltage, for example) it may be necessary to protect the
electric motor against high start-up currents by installing an overload protector
(Class 20 in accordance with IEC 60947, for example). Set up according to the
information provided on the motor nameplate to meet local requirements for
the motor protection switch. The local requirements may specify measures for
reducing the start-up current (soft start, frequency controlled start-up, for ex-
ample).
Set the switch in accordance with the rating on the motor nameplate.
Please observe the diagram at the motor.
After connecting the motor and after every time you alter the wiring, check the
direction of rotation. To do so, briefly switch on the motor and check whether a
suitable cover (e. g. a blank flange) is sucked on at the intake port.
If not, interchange two phases of the connection.
Observe the direction arrow on the motor fan cover.
In the case of custom pumps please note the information provided on a sepa-
rate sheet.
The pump must be sufficiently grounded. Always connect the protective
ground conductor in a professional manner and using a single piece of
wire.
Warning
NOTICE
To reverse running invert L1 and L2.
220-240 V 50/60Hz 380-400 V 50Hz
380-480 V 50Hz
Fig. 7 Motor connection diagram
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