Wegner Crane CFW500 series Applications Manual - page 66
Parameters Description
Crane | 66
NOTE!
A setting of “0.00 s” disables the load detection and slack cable alarm or fault.
P1056 – Slack Cable Alarm (A772) Delay Time
Adjustable
0.00 to 650.00 s
Factory Setting: 0.50 s
Range:
Proprieties:
Access groups via HMI:
SPLC
Description:
This parameter defines a delay time after it has been detected that the motor is being driven by the inverter,
instead of being braked by it, before generating the alarm “A772: Detected Slack Cable”.
NOTE!
The alarm is reset when a load hoisting command is given for at least 100 ms.
P1057 – Slack Cable Fault (F773) Delay Time
Adjustable
0.00 to 650.00 s
Factory Setting: 0.00 s
Range:
Proprieties:
Access groups via HMI:
SPLC
Description:
This parameter defines a delay time after it has been detected that the motor is being driven by the inverter
while lowering, instead of being braked by it, before generating the fault “F773: Detected Slack Cable”.
NOTE!
A setting of “0.00 s” disables the slack cable fault detection, and values different from zero disable
the slack cable alarm generation. It is necessary to use the sensorless vector or vector with encoder
control mode for the slack cable detection.
The slack cable detection operation diagram, considering that the crane x motion has been configured for two
speed references obtained from the digital input logic, is presented next. Only the motor frequency has been
considered in the brake control logic.