Danfoss VLT 5000 Crane Series Operating Instructions Manual page 11

10
VLT® 5000 Crane
Description of Functions
With Danfoss VLT 5000 Crane the hoist/lower function
can be infinitely varied in the whole speed range.
Up to 750 RPM for VLT 5052-5072, 1125 RPM for
VLT 5102, 1500 RPM for VLT 5152-5202, respectively
the max. torque curve applies and above 750
RPM for VLT 5052-5072, 1125 RPM for VLT 5102,
1500 RPM for VLT 5152-5202, respectively the
max. power curve. There is up to 130% torque for
acceleration in the whole speed range.
Working curve, motor:
1: Speed limit at heavy load (parameter 702)
2: Speed limit at normal load (parameter 701)
The 2-step gear box (see System description )
increases the working range, as it is possible to switch
between normal load and heavy load.
VLT 5000 will optimise the motor control to the selected
gear stage on the basis of the signal on terminal
29, see System Description, position 14.
Signal definition
24 V signal: Normal load
0 V signal: Heavy load
Operating Status at Remote Control
Control ready
Voltage on VLT 5000 Crane. The frequency
converter is ready for use and the control card
receives supply voltage.
No faults were found during initialisation.
Inverter section disabled.
Normal operation
The reference signal is higher than minimum. Up to
750 RPM the working range is limited by max. torque.
Above 750 RPM it is working in field weakening range.
Here the working range is limited by constant power.
MG.50.N4.02 - VLT is a registered Danfoss trademark