GREAT WATER QL-Serie Betriebsanleitung Und Wartungshandbuch Seite 8

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Important! - Maintenance guide - Thruster
To ensure quality and function of the thruster, use the fol-
lowing checklist prior to each season or minimum once a
year.
Warning!
When servicing the thruster(s), always turn off the
main switch(es).
Mechanical check
• Check for loose bolts, covers and cable supports.
Tighten if necessary.
• Check that the propeller can rotate freely.
• Check the propeller for damages. Replace if necessary.
• After removing propellers, use new bolt / washer / nut
when installing the propeller.
• If a motor support is installed. Please make sure it is
intact.
Battery / charger check
• Check the battery for clean and tight terminals and, if
possible, correct electrolyte level.
• Use recommended battery. The battery capacity must
correspond to the QL Thruster requirements table .
• Check the charging voltage, measured on the battery.
Correct charging voltage at 20°C (68 F) is:
14.4 V on 12 V systems
28.8 V on 24 V systems.
If not, please contact your service dealer.
High current cable / connections check
• Check all high current components and connections,
including main switch, fuse, possible bulkhead feed
through, motor and control unit connections. Be sure
that all connections are copper to copper (or copper to
brass). Any kind of other metals / materials between,
will result in voltage drop, see fig. 7. Tighten
connections if necessary.
• Check that cable dimension and length corresponds to
the QL Thruster requirements table.
• For optimal thrust, voltage measured at the control
unit (Batt + and Batt -/A1, see fig. 8) during operation
must be more than:
10.5 V on 12 V systems
21.0 V on 24 V systems
If the voltage is allowed to go below 10.5 V / 21 V,
when the thruster is operated, it will damage the main
relay.
• Check that there is a complete contact between the
fuse and the power cable lug. See fig. 9.
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Fig. 7
Component
Fig. 8
Fig. 9
Cable lug