VACUUBRAND MZ 2 VARIO-SP User Manual
Page 30
Internal setting of the motor speed via trimming potentiometer:
+
Ensure that no control signal is applied, e.g.,
by removing the white and the black wires
from the terminal board ST1B.
+
Supply the pump with the required supply
voltage of 24V DC.
Adjusting the motor speed with the trimming potentiometer:
Turning the trimming potentiometer to the right increases the motor speed
(maximum 2400 rpm);
Turning the trimming potentiometer to the left decreases the motor speed
(minimum 400 rpm). Left stop: 0 rpm
Maximum number of motor speed settings: 50
+
To stop pump, disconnect pump from DC voltage supply.
UB
+
+
+
+
V AB
ST1A
ST1B
Notes regarding the motor speed
Pumping at
high motor speed increases the pumping speed of the
pump (inlet pressure above approx. 7.5 Torr (10 mbar)). Ensure sufficient
cooling of the pump!
Pumping at
low motor speed improves the ultimate vacuum of the pump
and increases the lifetime of diaphragms and valves!