CP : control panel, FC : frequency converter, SB : supply board, CB : cooling board, CC : control cable, LL : lid locking, BC : braking chopper,
BR : brake resistor, MR : mains reset, EC : error cause, ES : error consequence, ER : error remedy, M : measurements, ECR : error-code reset
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2.7. Imbalance switch
• A switch detects any imbalance.
• Imbalance can only be detected in running mode (starting, centrifuging and braking).
• If any imbalance is detected, the drive is changed over to braking.
2.8. Interlocking
• Opening of the LL is prevented by a latch. The LL can only be opened when the relay
on the SB is energized by the CP. This occurs when the rotor is at standstill and
mains power is applied. A solenoid is energized and releases the latch.
• The centrifuge can only be started when the lid is closed. A microswitch on the LL
detects the position of the LL.
2.9. Cooling
• Temperature behaviour:
− When rotor is at standstill and the lid is locked, the cooling is operating.
− When rotor is at standstill and the lid is unlocked, there is no cooling.
2.9.1. Temperature sensor B1 in the centrifuge chamber
• This temperature is processed in the CP.
• The housing of the temperature sensor B1 also contains an overtemperature switch.
In refrigerated centrifuges this switch cuts off the drive at > 60°C.
2.9.2. Function of the cooling board (CB) A3
• Plugging station (X3) for the temperature sensor and the overtemperature switch in
the centrifuge chamber.
• The voltage of the temperature sensor in the centrifuge chamber plug X4 being
transmitted over a 10-pole CC to the CP plug X101.
• The signal of the overtemperature switch in the centrifuge chamber plug X4 being
onward transmitted over a 10-pole CC to the CP plug X101.
• Plugging station (X2) for the overheating protection B2 at the condenser.
• Relay circuit for the compressor and the fan. The overheating protection B2 at the
condenser is series connected to the relay voltage.
• Plugging station (X1) for the compressor and the fan.
2.10. Fan
• The fan cools down the refrigerant flowing through the condenser.
• The fan is parallel-connected to the compressor.
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