Wegner Crane CFW500 series Applications Manual - page 63
Parameters Description
Crane | 63
5 – The overweight alarm delay time has elapsed and the alarm A770, Detected Overweight, is generated. The
crane vertical motion is then decelerated according to the ramp programmed in P0103 and the digital output
DO4 is activated indicating the overweight condition.
6 – The command for brake closing is executed through the digital output DO1, the motor is decelerated down
to 0 Hz and remains magnetized.
7 – The load hoisting command is removed from the digital input DI1.
8 – The load lowering command is given through the digital input DI2. This action resets the overweight alarm
(after 100 ms), enabling the crane vertical motion to receive a new load hoisting command.
9 – The load lowering command is removed from the digital input DI2 and the motor remains magnetized (If
within the period programmed in P1027 a new hoisting or lowering command does not occur, the motor will be
demagnetized). The load remains stopped, being held by the mechanical brake.
3.14 MOMENTARY OVERLOAD (HORIZONTAL)
This parameter group allows the user to adjust the conditions for the crane horizontal motion momentary
overload detection at the load forward or load reverse stage.
Momentary Overload is an abnormal condition detected during the crane horizontal motion operation where,
during the command to load forward or load reverse, it appears that a further effort to get the load moving and
this can be caused by some object that is in route or a misalignment of the mechanical equipment.
P1052 – Momentary Overload Current Threshold
Adjustable
0.0 to 200.0 A
Factory Setting: 20.0 A
Range:
Proprieties:
Access groups via HMI:
SPLC
Description:
This parameter defines the momentary overload current threshold when, during the command to load forward
or load reverse, the momentary overload condition can be detected. In other words, if the actual motor current
is greater than or equal to the adjusted threshold, then the momentary overload condition will be detected at the
load forward or load reverse.
NOTE!
With the momentary overload detection, only is generate an alarm message “A770: Momentary
Overload”.
NOTE!
Setting this parameter in 0.0 disables the alarm.
P1053 – Momentary Overload Detection Delay Time
Adjustable
0.00 to 650.00 s
Factory Setting: 1.00 s
Range:
Proprieties:
Access groups via HMI:
SPLC
Description:
This parameter defines a delay time after the load forward or load reverse command has been given, before
initiating the momentary overload monitoring according to the current threshold defined in P1052.