Electrical Cables - Contacts - Husqvarna DMS 240 Workshop Manual

ELECTRICAL CABLES – CONTACTS 11
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Mains cable
Supply cables which have been "driven over" or abused are a relatively common
cause of interference. If the mains supply does not reach the machine, a broken
cable or faulty earth fault breaker is the possible cause. Carry out a visual
check of the outside of the cable for damage due to trapping. Also check that
the contact pins are undamaged. The mains cable with earth fault breaker is
available as a complete spare part.
Test of mains cable
The earth fault breaker does not allow the current to pass this when it is not
connected to the mains supply. In order to check the mains cable with a
multimeter, the earth fault breaker ends must be pulled apart to access the
connection points. Remove the two screws on each end.
Measuring instruments
For the tests below, a multimeter is used that is set for measuring a
broken/closed electric circuit. A closed circuit is normally marked with a
buzzer signal in the multimeter.
The illustrations below show: left illustration one contact point, right
illustration other contact point when measuring.
Cable: contact – earth fault breaker
Measure between the contact pin and earth fault breaker's connection point.
Repeat the measurement on the other pin/connection point (arrows).
Check in a similar way that the earth cable is intact.
Cable: earth fault breaker – switch
Make the same measurement between the earth fault breaker and incoming
cables to the machine's switches. Remove the connection box to access the
cables. The connection points differ between versions 120 V and 230 V, as
shown by the circuit diagrams on pages 17 and 18.
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