Varian 969-9840, Instruction Manual

Page: 11 / 18

SECTION III - OPERATION
87-900-865-01 ( B ) 6
3-1 General
Make all vacuum manifold and electrical connections
and refer to Turbo-V pump instruction manual prior to
operating the Turbo-V controller.
!
To avoid injury to personnel and damage to the
equipment, if the pump is laying on a table make sure it
is steady. Never operate the Turbo-V pump if the pump
inlet is not connected to the system or blanked off.
The controller operates completely automatically after
the remote start command is given.
The only user available commands are two trimmers to
set the pump rotational speed: the first one (P1) sets
the high speed, the second (P2) sets the low speed.
The two trimmers are factory preset as follows:
– P1 (high speed) to 60 KRPM
– P2 (low speed) to 33 KRPM
To select different rotational speeds, act on the
appropriate trimmer. The variation ranges are:
– P1: 50 to 70 KRPM
– P2: 30 to 50 KRPM
3-2 Startup
Plug the controller power cable into a suitable power
source.
The controller is factory preset with the Soft Start mode
enabled that allows the pump to ramp-up to Normal
speed slowly with a minimum ramp-up time of 75
seconds and a maximum of about 45 minutes.
If it is necessary to deselct this mode refer to
paragraph 3-3.
If the Soft Start mode is deselected, the ramp-up will be
done within 60 seconds.
3-3 Soft Start mode deselection
The Soft Start mode is enabled and disabled by means
of a jumper located on the controller PCB.
To deselect the Soft Start mode operate as follows:
– Disconnect the power from the controller.
– Move the red jumper from the actual position to the
other according to the label attached over the
integrated circuit near the jumper (see Fig. 3-1).
– Connect the power.
Figure 3-1- Soft Start jumper
3-4 Starting the pump
To start the pump it is necessary to set the Input A and
Input B signals on J15 connector both to low logic level,
or one to low and the other to high logic level.
In the first case the output to the pump is at low
frequency, in the other case the output is at high
frequency.
The time to change the speed from low frequency (33
KRPM) to high frequency (60 KRPM) is 12 sec.
The time to change from high frequency (60 KRPM) to
low frequency (33 KRPM) is 3 sec.
WARNING!