LEYBOLD SCROLLVAC plus - Check the Direction of Rotation

6.7.2Check the direction of rotation
CAUTION: DAMAGE TO PUMP
Risk of pump damage. When checking rotation, avoid dropping foreign matter into
the inlet. Dropping foreign matter into the pump can cause failure.
Make sure that the motor rotates in the correct direction. If it does not, the pump
and the vacuum system can become pressurised when operating the pump.
CAUTION: ROTATING PARTS
Risk of physical injury. Care must be taken not to touch any rotating parts.
CAUTION: VACUUM
Risk of physical injury. Avoid exposing any part of the human body to the vacuum.
The direction of rotation can be checked by operating the pump with the
inlet and exhaust ports open and checking that air comes out of the exhaust
outlet.
Alternatively, the direction of rotation can be determined by removing the
sealing grommet on the rear of the pump and observing the shaft rotation
using the following procedure:
1. Remove the sealing grommet on the rear of the pump using a suitable1.
tool.
2. With the electrical supply isolated, connect the pump electrical cable to2.
the electrical supply.
3. With the pump inlet unconnected, switch on the electrical supply for a3.
few seconds, then switch off the electrical supply again.
4. Check the direction of rotation of the shaft when viewed from the rear of4.
the pump. The correct direction is clockwise. This is also indicated by an
arrow on the rear of the pump. If the direction of rotation is incorrect:
▪ Switch off the electrical supply immediately.▪
▪ Isolate the pump from the electrical supply.▪
▪ Remove the terminal box from the pump as described above and▪
swap wires L1 and L3.
▪ Ret the terminal box to the pump as described above.▪
5. Replace the grommet after the rotation has been determined.5.
36 300668736_002_C7 - © Leybold
Installation