Dynamic Rotor Inertia Check (Dric); Instrument Chassis; Rotor Chamber; Vacuum System - Beckman Coulter Optima L-XP Instructions For Use Manual

Dynamic Rotor Inertia Check (DRIC)

As the rotor accelerates between 15,000 and 20,000 RPM, rotor inertia is measured and the rotor
energy is calculated for the speed set by the user. If the calculated rotor energy is determined to be
excessive, the instrument recalculates a permitted set speed and uses this value to avoid possible
rotor damage. A diagnostic message is displayed to indicate the change.

Instrument Chassis

Rotor Chamber

The chamber door is made of high-strength structural steel. A solenoid interlock prevents it from
being opened during operation. The door can be opened only if the power is on and the vacuum is
off, with the chamber at atmospheric pressure. See
accessing the chamber to retrieve your sample in case of a power outage.

Vacuum System

The Optima L-XP uses a diffusion pump in series with a mechanical vacuum pump to reduce
chamber pressure to below 5 microns (0.7 Pa). The system is automatically activated when
( )
and
Start
is closed. The vacuum system is also automatically activated when precooling or preheating of the
rotor is selected. (When the rotor is at rest, the instrument maintains a partial vacuum.) When the
vacuum system is on, the chamber pressure is displayed in microns in the Status window.
At the end of a run, the chamber vacuum must be vented (by pressing
before the door can be opened. (The vacuum cannot be turned off when the rotor is spinning faster
than 3000 RPM. If the key is pressed, an error message will appear.) After the door is opened, the
chamber returns to approximate room temperature to minimize condensation collecting in the
chamber. To help keep the chamber dry and clean, keep the door closed whenever possible.
In zonal operation, the door may be kept open while the rotor is spinning up to 3000 RPM. The
vacuum system is activated when the door is closed (after loading the rotor) and can be vented
before the rotor is unloaded, while the rotor is still spinning at up to 3000 RPM.

Drive

The frequency-controlled, air-cooled, direct-drive induction motor requires no gears or brushes. In
addition, the drive does not require an oil vacuum seal, external oil reservoir, or continuously
operating damper. Externally cooled by forced air and internally cooled by oil, the drive delivers
ultra-smooth, quiet performance, with high rotor-imbalance tolerance.
PN LXP-IM-7AB
are pressed, or may be turned on directly by pressing
CHAPTER 5, Troubleshooting
( )
Vacuum
(
Vacuum
1
Description
Instrument Chassis
for instructions on
( )
Enter
, if the chamber door
)
on the keypad)
1-3