Hayter Mowers 101 88 90-26 manual Microswitches Collision detectors, Cables, Batteries

TROUBLE SHOOTING

Microswitches (Collision detectors)

The front panel’s rear edge is suspended in two, spring-loaded aluminium levers.

These levers in turn activate two microswitches which are integrated in the “housings“ (see the diagram below) that connect the front panel with the box.

The microswitches are activated when the bumper on the front of the lawn mower hits an obstacle. These give a signal to the microprocessor that tells the lawn mower to back away. The lawn mower determines whether to reverse straight back and then turn to the left or right depending on whether the right- hand, left-hand or both microswitches are activated.

If you wish to check whether the microswitches are functioning proceed as follows:

1.Check that the microswitches ”click” when the levers are pressed back.

2.Dismantle the black cover plates on the sides of the microswitches.

3.Check that the levers (535 03 29-01) are not bent and that they run parallel to the side of the microswitch housing.

4.Check that the microswitch’s arm can move freely in the hole against lever.

5.Measure the voltage (the main power switch in position “1“) between the earth (the box) and one of the cables on the microswitch. The voltage should be 5.0-5.1 V on one pin and 0 V on the other.

Press the lever backwards, the voltage should be between 5.0 - 5.1 V between the earth and the connected cables. If a voltage value lower than 5 V is obtained then the microswitch is defective and should be replaced (presup- poses charged batteries).

Microswitch

535 03 29-01

6.Also check that the cables from the microswitch are correctly made in terminals 8-11 on connector X1 on the circuitboard. Right 8 (+) 9 (-) and left 10 (+) 11(-).

Cables

The cables are used to connect all the electrical components on the lawn mower that concern, propulsion, charging, communica- tion and mowing.

When checking whether a cable break has occurred all connec- tions must be removed before each individual cable is resist- ance measured using a multimeter.

For operations to be good, bearing in mind the short cable lengths in question, the resistance in the cables should be 0 ohm.

Batteries

Two, series connected 6V Nickel-Cadmium batteries are used in the lawn mower. One, 2.4V Nickel-Cadmium battery is used in the generator.

The batteries are used in the lawn mower to power the “compu- ter“, i.e. the circuitboard with microprocessor, even at night to ensure that the theft alarm works. The batteries also act as a buffer when the lawn mower is mowing in the shade or during a cloudy or a partially sunny day. This is why the lawn mower can still mow for short periods on cloudy days.

In the generator, the battery ensures that the loop is generating an electromagnetic field even when the sun is not shining sufficiently to power the generator. It is important that the generator is placed where it is well lit.

If the lawn mower requires long charging times on very sunny days and, despite this, only has a short operating time, it’s reasonable to suspect that the batteries need to be replaced. The batteries in the lawn mower should be changed in pairs to guarantee operations, as a new battery with a relatively old battery will reduce capacity and in some cases completely destroy the new battery. If changing the batteries does not help, check whether the solar panels are functioning correctly.

Another sign that the batteries are discharged is when the lawn mover frequently stops in the shade to charge.

If the lawn mower has difficulties in sensing the electromagnetic field from the loop cable when it’s cloudy, at daybreak or dusk, the battery in the generator may need to be replaced, see page

2.Thereafter check that the cables outside and inside the generator are in working order, and that there are no loose connections.

The lawn mower stands in the charging mode (2 beeps/10 seconds) for a maximum of 40 minutes, irrespective of whether the batteries are fully charged or not.

English – 7