Braking

• Electrical brake with manual operation,

• Disc brake pads easily accessible for inspection and replacement, no dismounting of motors

• Visual control of brake condition without dismounting

• Equipped with hydraulic systems, risk of oil leak

• Replacement of disc requires dismounting of related motor and brake unit.

• Control of brake condition only possible after dismounting of the brakes

VFD Control

• One Control Unit for all VFD, less components

• With spare on board, reduces downtime

• Individual Control Unit for each VFD

Control system

• Modern universal PLC used for central control

• Central controller has been used for many years.

• Intermediate electromechanical relays used for operating with actuators

Gears

• Gear units integrated in the drums. Only oil level checking is required during maintenance, very low risk of oil leak

• Bevel type gears equipped with hydraulic systems, risk of leaks

• High temperature and low-pressure alarms limiting performance

Load measurement system

• Crane load calculated from motor torque.

• Special load cells installed, which are exposed to weather, risk damage. Crane is blocked if load cell out of order

Slewing system

• Single motor and VFD, lower risk of failure

• 2 motors required, crane only operatable when both motors are working, higher risk of failure

Alarm and warning systems

• Alarm and fault messages illuminated in original coding, easy for analysis and troubleshooting

• Alarm and fault messages may be difficult to understand during troubleshooting

Maintenance access

• A door at back of crane pedestal provides easy access for maintenance

• All parts that need maintenance can be easily dismounted, without dismounting of non-related parts

• Limited space for replacement of certain crane parts.

Hook and jib position

• Position of the crane carried out by crane operator

• Special angle encoders are used

• A special calibration procedure required from time to time

High position of hook

• No calibration required

• Calibration required from time to time

Limit switches

• One box with 2 liner cams and 5 LS are used for both hoisting and luffing gears

• Two boxes with 7 angle cams and 7 LS are used for hoisting and luffing gears

Emergency operation

• Manual handle provided in each brake unit for fast emergency operation

• Handle hydraulic pump needs to be connected to different points for operation of each gear

Jib wire sheaves replacement

• Easy replacement without special tools

• Special tool and other devices are required

Wire replacement

• Easy and fast replacement via an opening near the housing and luffing wire drums

• Time consuming