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3.7
Imbalance sensor (B2.2)
•
An electronic sensor monitors the imbalance.
•
The imbalance sensor (B2.2) and the speed sensor (B2.1) are together in one
housing, screwed to the bottom of the motor (M1).
•
Imbalance is detected only in running mode (run up, centrifuging and braking).
•
If impermissible imbalance is detected, the drive switches off and the rotor slows
down braked until it stops.
3.8
Motor-driven lid lock (A3)
•
The lid can be opened only if the Electronics (A1) has detected rotor standstill.
•
By pressing the key
STOP / OPEN
the lid opens motor-driven.
•
The motor locks the lid only if both lid brackets actuate both lid switches (Ll, Lr), the
position switch (Mo) for position "lid opened" is actuated and the rotor has standstill.
•
The centrifuge can only be started when the lid is closed.
3.9 Cooling
system
•
The cooling system is a hermetical system.
•
The cooling system consists of the following components:
−
Compressor (M2, M2.1)
−
Cooling tubes around the centrifuge chamber (evaporator)
−
Condenser
−
Dryer
−
Fan (M3)
−
Temperature sensor T1 (B1) and overtemperature switch in the centrifuge
chamber
−
Temperature sensor T3 (B3) on the condenser
•
In the housing of the temperature sensor T1 (B1) also the overtemperature switch is
included. With centrifuges with cooling the drive switches off, when the temperature
is > 60°C / > 140°F, and with option Heating/Cooling > 120°C / > 248°F.
•
The refrigerant will be cooled down with a fan (M3). The speed of the fan is
controlled dependent to the temperature at the condenser.
•
When opening the lid of the centrifuge, the cooling system switches off.
•
When the rotor is at standstill and the lid is closed the centrifuge chamber will be
cooled on the preselected temperature, if this is lower than 20°C / 68°F.
During the standby-cooling the compressor is time-cycle controlled (2 minutes ON /
3 minutes OFF).
Содержание ROTINA 420
Страница 1: ...06 08 Andreas Hettich GmbH Co KG AR4701EN ROTINA 420 ROTINA 420 R Repair instructions ...
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