Operating Manual SIGMA 4-15C, page 33 of 95
03/06
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 locks
are automatically locked. Attention! Please do not leave your fingers between
lid and upper edge of the centrifuge housing when closing the lid. 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.
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