Pump Shutdown; Power Failure; Remote Control Mode Operation; Rs 232 Control Mode Operation - Varian Turbo-V 550 Mode D'emploi

and when the pump reaches the low speed value,
display reverts to:
N O R M A L
2 8
With normal LOW SPEED operation, the pump will run
at about 2/3 of its nominal speed and achieves a base
pressure somewhat higher
specifications. If the gas load becomes higher, the
controller output frequency and voltage decrease
automatically, and the Turbo-V pump is slowed down in
proportion to the gas load until it reaches 4 KRPM.
If the LOW SPEED mode is selected after normal
operating condition is reached, the display shows:
A P P R O A C H
X X
while approaching the low speed value.
When the low speed mode is deselected, the pump
accelerates to its rotational speed. During
acceleration, the display shows:
N O R M A L
X X

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.

Power Failure

In the event of a power failure (momentary or long
term), the Turbo-V controller will stop the turbopump
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
the turbopump in the proper sequence. The display
shows:
P U M P I S
1 2 X X
until normal operation achieved.
O P E R A T I O N
K R P M L S
than the standard
I N G L S
K R P M L S
O P E R A T I O N
K R P M
S T A R T I N G
K R P M

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
S O F T
If the Soft Start has been deselected the display shows:
P U M P
R E M O T E
With or without Soft Start mode selected the
START/STOP and LOW SPEED front panel push-
buttons are inoperative, while the CYCLE NUMBER
and PUMP CURRENT pushbuttons are always active.

RS 232 Control Mode Operation

If the RS 232 option is installed and the controller has
the
been programmed for RS 232 operation, the controller
may be driven by a computer and when ready to
operate, the display shows:
P U M P
R S 2 3 2
If the Soft Start has been deselected the display shows:
R E A D Y
S O F T
With or without Soft Start mode selected the
START/STOP, LOW SPEED functions are under
computer control, while the CYCLE NUMBER and
PUMP CURRENT front panel pushbuttons are always
active.
93
TECHNICAL INFORMATION
F O R R E M O T E
S T A R T
R E A D Y : U S E
S T A R T
R E A D Y : U S E
L I N E
F O R R S 2 3 2
S T A R T
87-900-873-01 (F)