Soft Start - Agilent Technologies TwisTorr 305 FS User Manual

Instructions for Use

Soft Start

To ensure the correct lubrication of the turbo pump bearings, at the first
WARNING start after installation, the controller automatically sets (and cannot be
deactivated by the user) a ramp of gradual pump boot called "Soft Start"
(the pump is driven in rotation for successive speed steps).
Once the Soft Start has been successfully completed, the subsequent
starts will take place according to the normal mode then with a ramp of
continuous climb (and no longer in steps).
In case of use of a new pump with an used control unit, remember to set
manually the soft start mode.
The soft start mode will take a longer time compared to the standard
start-up; the user must wait that the pump is completely up to speed
before stopping the pump.
After the first start, the pump won't be started in soft start mode again by
the control unit.
The user can decide to start the pump using the Soft Start ramp as needed, acting
on the serial command (or on the remote input), as detailed in the chapter
"Technical Information" (ref. to Window Meanings paragraphs - for serial - and
Controller Connection paragraph, P1 - Input - for remote input respectively).
When the Soft Start mode is active (both when it has been started automatically by
NOTE
the controller at the first start and when it has been manually activated by the user),
the controller gives indication showing on the display:
the "SOFT START MODE" message.
•
a bar indicator that evolves in correspondence with the evolution of the speed
•
steps.
The bar indicator is displayed in the upper right corner of the display (ref arrow A) in
addition to and simultaneously with the other messages already present on the
same. The message "SOFT START MODE" is showed on the display alternately with
other messages (ref arrow B) and remains permanently displayed for about 3
seconds. When the controller display no longer shows either the bar indicator or the
STARTING message alternately with the SOFT START MODE message, but displays
only the NORMAL message, then the SOFT START has been successfully
completed.
During automatic soft start (first start), if this should be interrupted before it is
completed (for example the controller shuts down due to network failure or a STOP
message is sent to the controller), at the next restart the controller will reactivate
the soft start ramp automatically.
168 Agilent TwisTorr 305 FS Remote Controller User Manual