Operation
3.4 Operation
During normal operation the TURBOVAC runs with target
speed. The LED NORMAL lights and the LED chain
shows - starting at the bottom and moving upwards -
the current consumed.
In case of increased load (e.g.increased pressure due to
a leak) the speed is compensated via an additional cur-
rent consumption.Thus, the number of the lighting LEDs
is a measure of the pressure rise.
A further pressure rise beyond the point of the max. cur-
rent limitation leads to a decreasing speed due to an
increasing gas friction.
The speed will likewise drop when the temperature of the
TURBOVAC or TURBOTRONIK is too high, the LED
OVERLOAD lights up.
If the target speed drops below 95% the LED chain indi-
cates the speed. The LED NORMAL flashes.
If the speed drops below the minimum speed, the TUR-
BOVAC is switched off and the LED FAILURE lights up.
3.5 Shut-down of the
TURBOVAC
Pressing the STOP key switches off the pump and the
heater and activates braking.
The forevacuum pump will be switched off provided it is
connected via FOREPUMP; the TURBOVAC will be ven-
ted if the venting valve is connected via (3/13).
The LED in the STOP key lights up, and the LED NOR-
MAL flashes until the TURBOVAC stands still.
The motor brakes the pump actively until it comes to a
complete standstill; the speed is again indicated by the
LED chain.
If a malfunction occurs the FAILURE signal can be reset
via the STOP key provided the cause of malfunction has
been eliminated and the rotor of the TURBOVAC stands
still.
3.6 Venting of the
TURBOVAC
Vent the TURBOVAC every time the TURBOVAC is
switched off in order to prevent a potential backstrea-
ming of oil vapors from the forevacuum line to the high-
vacuum side.
If a power failure airing valve or a delayed venting
device is connected to the socket (3/13) VALVE the TUR-
BOTRONIK controls venting automatically.
3.7 Power Failure -
Linecord Interruption
If there is a power failure or if the power plug is
accidentally disconnected, the TURBOTRONIK automa-
tically switches over the drive of the TURBOVAC to gene-
rator operation. This means that during run-down of the
pump, the active magnetic bearing regulation will be
maintained until the rotor sets down on the touch-down
bearings with the rate of rotation being low.
If the connecting lines between the TURBOVAC and the
TURBOTRONIK are interrupted, the automatic gener-
ator operation and the emergency power supply to the
active magnetic bearing are put out of operation. In this
case, the rotor is set down immediately onto the touch-
down bearings, runs down with a considerable noise
level and there is a risk that the touch-down bearings are
damaged.
The connection line to the TURBOTRONIK is secured
against accidental interruption. If it is, nevertheless, inter-
rupted e. g. by mechanical destruction, brake the TUR-
BOVAC via venting until it stands still.
19
GA 05.218/3.02 - 11/97
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