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•
If the Soft Start mode has been deselected the display
will change and shows:
P U M P
I
S
1 2
X X
where:
1 2 = contrast inverted identifies the set point
condition:
− 1 is displayed when relay R1 is de-energized
and the related output is zero voltage.
− 2 is displayed when relay R2 is energized and
the related output is 24 V.
XX KRPM = indicates the actual theoretical
rotational speed of the pump as a function of the
controller output frequency (range 3 to 38 KRPM).
•
After START command, voltage and frequency
output will be at the maximum level, then the
frequency will decrease to a value proportional to
the pump rotational speed (about 3 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 select
the other parameters to be displayed pressing the
PUMP
CURRENT
pushbuttons.
•
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
(38 KRPM for high speed, or 25 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. Than the Turbo-V
pump is slowed down in proportion to the gas load at
least until it reaches about 3 KRPM display shows:
S T A R T
I
N G
K R P M
or
the
CYCLE
NUMBER
O P E R A T
I O N
K R P M
the
rotational
speed
N O R M A L
1 2
X X
even if any previous display selection was made.
This will occur either in NORMAL operation or with the
LOW SPEED selected.
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
With the FRONT panel operation selected, the remote
operation is inoperative; conversely, the CYCLE
NUMBER and PUMP CURRENT pushbuttons are
always active, even when the operating mode selected
is REMOTE.
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 pushbutton once if the display shows:
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
89
TECHNICAL INFORMATION
O P E R A T
K R P M
NOTE
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
87-900-906-01 (E)
I O N
I O N
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