Operating The Pump - Agilent Technologies Turbo-V 70 PCB Bedienungshandbuch

The pump will accelerate to its normal rotational speed and when
this 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
where: XX =indicates the rotational speed (75 KRPM for high
speed, or 50 KRPM for low speed).
During acceleration of the pump or during any operating
condition, it is always possible to select the other parameters to
be displayed (PUMP CURRENT or CYCLE NUMBER push-
buttons). If this is the case when the pump reaches the normal
speed, the display reverts to the previous figure.

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 9 KRPM. 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.
Turbo-V 70 PCB Controller User Manual / 87-900-871-01 (E)
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