Wegner Crane CFW500 series Applications Manual - page 60
Parameters Description
Crane | 60
5 – The speed reference 2, programmed in P1032, is selected through the digital input DI4. The load is then
accelerated to that speed reference 2 selected through the digital input DI4. Note that the motor current
increases, but momentary overload is not detected while forward the load.
6 – The motor reaches the speed reference 2 and keeps forward the load at that speed.
7 –The motor deceleration begins. The brake remains release.
8 – The motor frequency becomes less than or equal to the threshold adjusted in P1048, and the command to
close the mechanical brake is executed through the removal of the digital output DO1 command.
9 – The motor is decelerated down to 0 Hz and remains magnetized (If within the period programmed in P1027
a new forward or reverse command does not occur, the motor will be demagnetized). The load remains
stopped, being held by the mechanical brake.
3.13 OVERWEIGHT (VERTICAL)
This parameter group allows the user to adjust the conditions for the crane vertical motion overweight detection
during the load hoisting stage.
Overweight is an abnormal condition detected during the hoisting stage of the crane vertical motion operation.
It indicates that the load weight is greater than the maximum established for normal operation.
NOTE!
A direct load weight measurement is not performed, i.e., the weight determination is based on the
motor current measured by the CFW500 frequency inverter.
P1051 – Overweight Current Threshold in the Minimum Speed
Adjustable
0.0 to 200.0 A
Factory Setting: 20.0 A
Range:
Proprieties:
Access groups via HMI:
SPLC
Description:
This parameter defines the overweight current threshold, so that the overweight condition can be detected
during the hoisting stage in the minimum speed (P0133).
NOTE!
A setting of “0.0 A” disables the overweight detection.
P1052 – Overweight Current Threshold in the Maximum Speed
Adjustable
0.0 to 200.0 A
Factory Setting: 17.0 A
Range:
Proprieties:
Access groups via HMI:
SPLC
Description:
This parameter defines the overweight current threshold, so that the overweight condition can be detected
during the hoisting stage in the maximum speed (P0134).
Through the overweight currents and as the operating speed you can generate an overweight curve thus
allowing a higher current at low speeds than at high, as shown below: