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3.4 Lid lock Y1
• Opening of the lid lock is prevented by a latch. The lid lock can only be opened when
the relay REL 602 on the power board is energised. This occurs when the rotor is at
standstill, mains power is applied and the key is pressed. The solenoid is ener-
gized for three seconds and releases the latch.
• The centrifuge can only be started when the lid is closed. A microswitch on the lid
lock detects the position of the lid lock (open/closed) and report it to the power
board.
3.5 Imbalance switch S2 (only with EBA 20 C)
• A microswitch (break contact) 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.
4 Troubleshooting procedures
• Fuses in installation in which centrifuge is installed are intact.
• Mains input fuses of centrifuge are intact.
• Supply voltage present at (see circuit diagram):
− Connecting cable
− Appliance plug
− Mains switch
− Power board A1, plug ST1.1 (L) and ST1.2 (N)
• Look for the displayed error code in the chapter "Error messages".
• Remedy the error according to the instructions.
• Carry out a functional check after every repair and whenever a component is
replaced, see chapter "Functional check after a repair".
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