STT293 CONCISE TOWER CRANE MANUAL
59-
EURC1.0ENG
3.4.
MALFUNCTIONS
-
The slewing mechanism is provided with an electronic control device that:
-
Controls slewing acceleration and deceleration;
-
Prevents changing of the slewing direction by a control error;
- If a malfunction occurs, working with the crane must be stopped and its cause
must be eliminated.
Table 3-4-1
Operation
Normal
Abnormal
Slewing movement from “0”
position on joystick.
Slewing starts gradually up to
its maximum speed.
Slewing starts abruptly. The
tower deforms.
Slewing movement towards
“0” position.
The slewing movement slows
down and stops after 7-10
seconds.
Slewing stops instantly. The
tower deforms.
Shunt bridging.
Free slewing.
Slewing stops suddenly.
!
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