3-18 Operating Manual

2.5 Electronic Control
The electronics controlled by two microprocessors allows extensive adaptations
of the centrifuge to the different tasks. The following parameters can be
programmed and displayed among others:
− Speed (by activation of FINE steps of 1 or 10 rpm possible)
− RCF in steps of 1 or 10 x g
− Time preselection (9 h, 59 min max.), in steps of 1 min or 1 sec
− Continuous operation
− Short-time operation
− Fixed deceleration and acceleration curves
− Free creation of deceleration and acceleration curves
− Saving, recalling and alteration of programs
− Input and measurement of the time integral
− Start delay
− Continuous self-monitoring and recognition of errors which are displayed and
saved for service
2.6 Safety Devices
Apart from the passive safety devices due to the instrument's mechanical design
there are the following active precautions for your safety:
2.6.1 Lid Lock, Cover Closing Device
The centrifuge can only be started when the power switch is switched to "ON“
and when the lid is correctly closed. After closing the lid the motorized lid lock is
automatically locked. The lid can only be opened when the rotor has completely
stopped. If the lid is opened by the emergency release during operation, the
centrifuge will immediately switch off and decelerate brakeless up to standstill of
the rotor. If the lid is open, the drive is completely separated from the mains
supply, that means starting of the centrifuge is impossible (refer to chapter 9.5.4
"Emergency lid release").
2.6.2 Imbalance Monitoring System
In the event that uneven loading leads to imbalance, the drive is switched off and
an imbalance warning message is displayed.
Operating Manual SIGMA 3-18, page 35 of 95
03/06