RUN EXCITE-2008: Service & Maintenance Manual - rev. 1.3
Page 6.35
Follow the procedure step by step to correctly diagnose the problem. Take particular care with the
checks highlighted by circled numbers, which are described in detail below:
(1) Check the parameter setting as detailed in paragraph: 9.2.12. “Enable up/down motor”.
(2) Open the ALE/AT UL driver cover plate and press manually the limit switch. When the limit
switch is pressed, DWN-SW LED has to be ON while has to be OFF if released.
(3) Place the tester probes across pins 6 and 4 of connector J7 on the ALE and AT UL driver
board. The measured value should be approximately 2.5 Vdc. If an oscilloscope is available,
it is possible to view the pulses produced by the encoder itself.
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