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Elevator positioning system USP 30 / 100
Trouble Indication
Red
(page 62 - Reference E)
The receiver can either indicate no position of the sender, it cannot generate any absolute value
or it does not receive any signal at all.
Possible Causes
• Sharp bends in the wire (ca. 90% of all causes)
• Scratches of the wire
• Missing trigger signal for the USP sender
• Failure of sender
• Failure of receiver
Action, execution and relieve
• Inspection of wire: bends or scratches
• Inspection of damper
Follow the trouble shooting procedure yellow.
Check if the yellow LED of the sender is on.
If the yellow LED does not give a signal, you should inspect the connection of the wiring.
Possible causes for these failures are:
• The transit of the trigger signal to the trailing cable in the termination box.
• The trailing cable itself
• The application of the trigger signal from the trailing cable to the connection wire
(termination box of the car)
Hint:
We have learnt that the malfunctioning of the USP unit is hardly ever the reason for
failures. However, if you have not yet found the cause of trouble you should first part
exchange the receiver and at last the sender.
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