Pump Shutdown; Power Failure - Varian Turbo-V 70 Bedienungshandbuch

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 F O R
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 A C H
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 S
1 2 X X
N O R M A L
X X
With normal LOW SPEED operation, the pump will run
at about 2/3 of its nominal speed and achieves a base
pressure somewhat
specifications. If the gas load becomes higher, the
controller output frequency and voltage start to
decrease automatically, and the Turbo-V pump is
slowed down in proportion to the gas load until it
reaches about 9 KRPM.
L O C A L
I N G L S
K R P M
: P U S H
B U T T O N
O N
- - - - - - ]
S T A R T I
K R P M
O P E R A T I O N
K R P M
higher than the standard
If the LOW SPEED mode is selected after normal
operating condition is reached, the display shows:
A P P R O A C H
L S
while approaching the low speed value.
When the low speed mode is deselected, the pump
starts to accelerate to its rotational speed.
The display shows:
N O R M A L
L S

Pump Shutdown

Press the front panel STOP pushbutton or remove the
remote signal; the power from the turbopump will be
removed and the pump will begin to slow down.
L S
An emergency stop signal is provided via a remote
contact. This signal is active in any of the three
operation selections: FRONT, REMOTE, RS 232; when
activated, the display will be as shown in the following
figure.
L S

Power Failure

In the event of a power failure (momentary or long
N G
term), the Turbo-V controller will stop the turbopump
L S
and all the interconnected pumps/devices. The Turbo-V
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 controller
automatically restarts the interconnected devices and
L S the turbopump in the proper sequence.
The display shows:
P U M P
1 2
until normal operation achieved.
884
TECHNICAL INFORMATION
I N G
X X K R P M
O P E R A T
X X K R P M
S Y S T E M
O V E R R I D E
I S S T A R T
X X K R P M
L S
L S
I O N
I N G
87-900-868-01 (F)