VACUUBRAND MD 1 VARIO-SP - Manual (Page 19)

page 19 of 68
sures must also allow for the requirements of the respec-
tive application.
Pumps with AC motor:
In case of overload, the motor is shut down by a self-hold
thermal cutout in the winding.
Note: Only manual reset is possible. Switch off the pump
and disconnect from the power source. Identify and elimi-
nate the cause of failure. Wait approx. five minutes before
restarting the pump.
• Note: In case of supply voltage below 100V, the lock
of the cutout might be impaired and the pump may
restart on its own after sufficient cooling down. Take
appropriate precautions, if an automatic restart of the
pump may lead to a dangerous situation (e.g., switch
off the pump and disconnect from the power source).
Pumps with DC motor:
A temperature sensor at the circuit board protects the mo-
tor: Current limitation in case the temperature at the circuit
board raises above 158°F (70°C). At temperatures above
185°F (85°C) the pump switches off. In case of a motor
blockage (after 10 start-up attempts) the pump switches off.
Note: Only manual reset is possible. Disconnect the pump
from the power source. Identify and eliminate the cause of
failure.
Maintenance and repair
In order to comply with laws (occupational, health and
safety regulations, safety at work law and regulations for
environmental protection) vacuum pumps, components
and measuring instruments can only be returned when
certain procedures (see section „Notes on return to the
factory“, pg. 60) are followed.
Take advantage of our service seminars, which put special
focus on the maintenance and repair of vacuum pumps.
NOTICE