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Chapter 12 Repair
In order for the robot to be able to execute its missions the lid needs to be shut, and to form
a closed circuit between magnets on the lid and relays on the body. This circuit needs to be
open when the lid is open and when the lid is pressed down and acts as the stop button.
This requires that all magnets and relays are functioning correctly and some precision in their
positioning.
The figure below shows a schematic representation of the situation.
Figure 109: Closed lid
One of the relays is "Normally Closed" (NC) and the other is "Normally Open" (NC). The
circuit is shown below.
Figure 110: Lid circuit
When the lid is closed the magnet must be in a position to align with the reed relays and close
the circuit which allows the robot to operate.
When the lid is open, the circuit it open, thus preventing the robot from operating.
When the lid is depressed, the roles of the two relays are reversed and the circuit is open
thus preventing the robot from operating.
If there are problems with the lid closure you can analyze the problem by running a test.
Select Service > Tests > Lid from the Technician's menu (page 114).
Relays
The pairs of relays must be installed one above the other in the correct order:
- NO must be on top. This relay is identified as having the digit 1 in the reference number.
- NC must be on the bottom. This relay is identified as having the digit 4 in the reference
number.
The relays are supplied as two pairs and the cabling between them.
- Product number YB-033-00021
190 Turfmow 1000 Technician's Manual Version: Release 3.5 Last updated: 2018-12-20
190


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