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• The braking chopper transfers the electrical energy produced during braking, in the
230 V version from a voltage of approx. 400 Volt and in the 115 V version from a
voltage of approx. 209 Volt, to the brake resistor in a controlled manner.
• Status indication with a green LED:
Standby: the green LED lights up
Centrifugation run: the green LED lights up
Case of error: the green LED flashes
If the drive processor detects an error, it switches off the motor.
3.3 Special features
• Multiprocessor concept:
The control- and the drive-processor monitoring one another. If one processor stops
working, the other processor switches off the drive.
• Interface concept:
The information transmission is monitored with an additional check sum.
• Hardware concept:
All safety related switches are break contacts. This also ensures that loose contacts
and cable rupture can be detected.
3.4 Brake resistor (R1)
• An overtemperature fuse protects the brake resistor against fire. If the braking
chopper has a short circuit, the brake resistor becomes hot due to the high current,
and the overtemperature fuse (F1) disconnects the supply voltage of the centrifuge.
3.5 Motor (M1) / tacho system (B4, B2.1)
• The motor is a three-phase asynchronous motor with two pairs of poles.
• A speed sensor (B4, speedometer) which is screwed onto the motor receives
− the rotor code information and
− the speed information (6 pulses per revolution)
from the magnets of the tacho ring attached to the rotor.
• An additional speed sensor (B2.1, speedometer) is together with the imbalance
sensor (B2.2) in one housing. This housing is screwed to the bottom of the motor.
The speed signal (1 pulse per revolution) will be triggered by a magnet fixed at the
motor axle. This signal is used for the release of the motor-driven lid lock.
• The Electronics U320 (A1) monitors and regulates the speed.
− Double safety:
The drive-processor has been programmed in such a way that it
switches off the drive when the speed is higher than the permis-
sible rotor speed. Then error message "FU/CCI-ERROR 84" will
be displayed.
• The Electronics U320 (A1) monitors the rotor standstill.
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