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Belinda RobertsonAug 9, 2025
What to do if Becker S55 Control Unit has no reaction when pressing buttons but LED +UB/power illuminates?
- JJeanne YoungAug 10, 2025
If your Becker Control Unit shows no response when pressing buttons, but the LED +UB/power is lit, consider the following: * Inspect the drive's safety circuit, including the crank (chain), drive temperature, and safety limit switch (S1F/S2F, yellow cam). * Verify terminals 3/6 (STOP), 9/10 (LS), and 14/15 (slack rope). Bridge these terminals if they are not in use. * Ensure that the control card you're using is appropriate for the drive. Use the MLS Basic Card/MLS Professional Card for drives with mechanical limit switching, and the ELS Professional Card for drives with electronic limit switching (BES).
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