Varian Turbo-V 300 ICE, Instruction Manual

Page: 74 / 80

TECHNICAL INFORMATION
87-900-902-01 (G) - TURBO-V 300 ICE CONTROLLER 67
Monitor Relay Programming
•
The display shows:
Pump Shutdown
Press the front panel STOP push-button or remove the
remote signal; the power from the turbopump will be
removed and the pump will begin to slow down.
H . S . T H R E S H O L D
S E T T I N G ; X X K R P M
where:
XXKRPM
= is the switch point of relay S1 at the
preset turbopump speed, adjustable from 00 to 56 KRPM.
The speed threshold will condition the S1 operation (see
the following cycle diagram] and it is factory-set to 53
KRPM.
The speed threshold will condition the S2 operation (see
the following cycle diagram] and it is factory-set to 24
KRPM.
Power Failure
In the event of a power failure (momentary or long term),
the Turbo-V ICE controller will stop the turbopump and all
the interconnected pumps/devices. The Turbo-V ICE vent
valve device, if used, will vent the turbopump only if the
power failure is longer than the preset delay time. When
power is restored, the Turbo-V ICE controller automatically
restarts the interconnected devices and the turbopump in
the proper sequence.
Cycle diagram
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 (250 W with water cooling, or 150
W with air cooling).
Then the Turbo-V ICE pump is slowed down in pro- portion
to the gas load at least until it reaches about 4 or 3 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.
The display shows:
P U M P I S S T A R T I N G
1 2 X X K R P M H J H S
until normal operation achieved.
Remote Control Mode Operation
If remote signals are used to operate the controller, it must
be programmed for remote operation (see paragraph
"Operating parameter selections") and when ready to start,
the display shows:
R E A D Y F O R R E M O T E
S O F T S T A R T H S