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Revision 8.6
SECTION 5 : COMMISSIONING
76
released and the lower contactors are activated. The motor is then driven in the lowering direction
until the selected speed is achieved.
If the load should become an overhauling load then the system will automatically revert to the counter
torque mode. This operating principle is selected for safety reasons as the hoist contactors are
always activated first. The resultant effect ensures for fail-safe operation and the effective
management of the motor and brake and allows for precision placing of material loads or cargo.
5.5.
TRAVEL OPERATIONS
The following paragraphs detail the operational procedures during travel operations tasks;
5.5.1.
Travel In All Directions
As soon as one of the four direction speeds on the master controller is selected, the THYROMAT will
activate one of the travel directional contactors that will supply power to the motor; a short delay in
time is provided before the brake is released. Selection of one of the three slow speeds will regulate
the motor to the associated speed; in the event that full speed is selected the motor will accelerate
smoothly until full speed is achieved.
Bringing the master controller back from full speed to one of the slower speeds will cause the drive
torque to be removed from the motor until such time that the selected speed is achieved. In the event
that the master controller is brought back to the zero position braking torque will be applied to the
motor until zero speed is reached.
If during slow speed regulation the crane begins to increase speed above the selected speed the
reversing contactors will be reversed and counter torque applied until the crane’s speed has reduced to
the selected speed.
NOTE
Brake plugging to neutral or between notches
may be disabled by the respective parameters,
in this case the motor will coast to the desired
speed or to stand still in the event of neutral
position.
When the joystick is placed into the opposite
direction of the actual crane movement, brake
plugging is always applied; it can not be
disabled by a parameter choice.