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After START command, frequency
the maximum level, then it will decrease to a value
proportional
to the pump rotational speed (about 4
KRPM if the pump is completely stopped).
The pump will accelerate to its normal rotational speed.
•
During acceleration of the pump or during any
operating condition, it is always possible to
the other parameters to be displayed pressing the
PUMP CURRENT or the CYCLE
pushbuttons.
•
After the runup time and when the normal rotational
speed is reached, the display will be as follows,
even if any previous display selection was made,
and the normal condition has been reached.
N O R M A L
X X
where: XX = indicates the rotational speed (42 KRPM
for high speed, or 28 KRPM for low speed).
Operating the Pump
After the starting period, if the system has a vacuum
leak or the pressure in the pump chamber is high (from
1 mbar to atmosphere), the pump continues to operate
indefinitely. If the gas load at the turbopump inlet flange
continues to stay high, the power drawn by the
turbopump increases up to the maximum value (325 W
with water cooling, or 221 W with air cooling).
The Turbo-V pump is slowed down in pro- portion to the
gas load at least until it reaches about 4 KRPM.
As soon as the gas load decreases, the pump will
automatically accelerate to reach normal operation.
The pump can be stopped at any rotational speed and
can be restarted at any rotational speed from either the
front panel buttons or the remote connections. The
controller automatically synchronizes the output to the
rotational speed of the pump and then accelerates
linearly up to the nominal speed or within steps if the
Soft Start has been selected.
Low Speed Operation
This feature is provided for operating the pump at
moderate high pressure with high gas throughput.
To operate in this low speed mode, engage the LOW
SPEED push-button once if the display shows:
output will be at
select
NUMBER
O P E R A T
I O N
K R P M
R E A D Y
S O F T
S T A R T
or:
P U M P
R E A D Y
S T A R T
or:
N O R M A L
X X
or twice if the display shows other parameters, either
before starting the pump or after it is operating.
If LOW SPEED is selected before starting the pump,
the display shows:
R E A D Y
S O F T
S T A R T
The pump reaches the Normal high speed, then
decrease the speed to the low speed value and the
display shows:
A P P R O C H I
X X
If the Soft Start has been deselected the display shows:
P U M P
R E A D Y
S T A R T
where: LS = means low speed mode is selected.
After starting, a LS appears on the right bottom corner
of the following displays:
S O F T
S T A R T
[
-
-
-
-
P U M P
I
1 2
X X
N O R M A L
X X
72
TECHNICAL INFORMATION
F O R
L O C A L
:
P U S H
B U T T O N
O P E R A T
K R P M
F O R
L O C A L
N G
L S
K R P M
:
P U S H
B U T T O N
O N
-
-
-
-
-
-
]
S
S T A R T
K R P M
O P E R A T
K R P M
87-900-873-01 (C)
I O N
L S
L S
L S
L S
I
N G
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I O N
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