VACUUBRAND MD 1C VARIO-SP - Manual (Page 50)

page 50 of 87
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.
NOTICE
• Note: In case of supply voltage below 100V, the lock
of the breaker may not latch and the pump might re-
start on its own after sufficient cooling. Take appropri-
ate precautions, if an automatic restart of the pump
may lead to a dangerous situation.
Make sure the fan’s air supply is adequate.
Check fan regularly for dust/dirt. Clean fan
guard grill if necessary to avoid a reduction of
ventilation.
NOTICE
A warm up period (approximately 15 min.) is
required to ensure that the rated ultimate vac-
uum, the pumping speed, and the full vapor
pumping rate are attained.
O ➨ I
m 3 /h
Torr/mbar
✔
✔
~15min
air
Important notes regarding the use of gas ballast
Gas ballast is a continuous purge to keep the pump’s in-
terior as clean as possible and to reduce the possibility of
condensation inside the pump.