Hettich EBA 21 - Description and Elimination of Errors

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5.3 Description and elimination of errors
TACHO - ERROR 01
Error During centrifugation the speedometer pulses are interrupted.
Error
consequence
The rotor slows down until it stops.
After the rotor stops, there is a DC braking for 30 sec.
An MAINS RESET during slowing-down causes a DC braking
for 3 min.
After the DC braking, the ”open the lid” release takes place.
Cause of error /
measurements
• Speed sensor (speedometer) defective or loose contact on
plug. Measure speedometer pulses on plug X4 / supply
board (pin 4 - pin 2).
• Flat ribbon cable to control panel, or flat ribbon cable to
frequency converter is defective.
Measure speedometer pulses on control panel / plug X1
(pin 14) and on frequency converter / plug S501 (pin 8).
• Supply board or control panel or frequency converter is
defective.
Error code reset Open the lid. Turn the rotor by hand and perform a MAINS
RESET while the rotor is turning.
TACHO - ERROR 02
Error There are no speedometer pulses on the control panel after
start-up.
Error
consequence
The rotor slows down until it stops.
After the rotor stops, there is a DC braking for 30 sec.
An MAINS RESET during slowing-down causes a DC braking
for 3 min.
After the DC braking, the ”open the lid” release takes place.
Cause of error /
measurements
• Start-up took place without the rotor.
• Motor not connected.
• Motor is defective.
• Speed sensor (speedometer) defective, or loose contact on
plug. Measure speedometer pulses on plug X4 / supply
board (pin 4 - pin 2).
• Flat ribbon cable to control panel, or flat ribbon cable to
frequency converter is defective.
Measure speedometer pulses on control panel / plug X1
(pin 14) and on frequency converter / plug S501 (pin 8).
• No release signal to frequency converter.
• Supply board or control panel or frequency converter is
defective.
Error code reset Open the lid. Turn the rotor by hand and perform a MAINS
RESET while the rotor is turning.