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On units fitted with analogue controls, on startup a warning beeper sounds and a warning light on the crane illuminates until both stabilisers are deployed.
The 'top arm up' and 'bottom arm down' functions are disabled until there is a positive downward pressure on the stabiliser foot.
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Never move the stabilisers with any load on the arms. This is highly dangerous. If the stabilisers lift off the resting place during a loading operation, the correct action is to move the load back over the stabilisers before manoeuvring the load back over the trailer, keeping the distance between the bottom of the load and the twistlocks as small as practicably possible. If the stabilisers continue to lift then first return the load to the ground before deploying the stabilisers further in order to increase foot pressure. |
System Logic |
Warning Buzzer and Light |
Relay (no) |
Top Arm Up |
Top Arm Down |
Bottom Arm Up |
Bottom Arm Down |
Both Stabilisers touching the ground |
NO |
CLOSED |
YES |
YES |
YES |
YES |
Either or both Stabilisers off the ground |
YES |
OPEN |
NO |
YES |
YES |
NO |
