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3.
Function Details
3.1 Wire Length Detection
Wire Length Detection detects the length of the wire on the lifting and lowering shaft using
information from the encoder connected to the drive. The proportion of the length from the
hoisting limit position (forward travel limit activation position) to the lowering limit position
(reverse travel limit activation position) of the lifting and lowering shaft can be externally output
as a percentage.
In cranes with a long lifting range, monitoring the wire length can be used as a guide for
changing the speed reference and inputting the Stop command. This function can also be used
as wire length information for Cargo Swing Suppression on the traverse shaft or traveling shaft.
Refer to "3.2 Cargo Swing Suppression" for more information about Cargo Swing Suppression.
◆
Applicable Control Modes
•
V/f Control w/ PG (A1-02=1) *Use the dual-phase or higher encoder option.
•
Closed Loop Vector (A1-02=3)
Precautions
•
This function cannot be used when encoder output is single-phase.
•
The multi-function analog output voltage of U9-02 [Hook Position (%)] at the hoisting limit
position is 0 V, but the lowering limit position can also be changed to 0 V with S9-05 [AO 0V
Reference Hook Position].
•
If the wire length has a certain amount of length at the hoisting limit position, adjust that with
the analog monitor gain and bias.
•
When S9-02=0 [Hook Position Reset @Power down] is selected, oPL [Origin Position Loss
Detected] will be output each time the power supply is turned ON.
Reset oPL according to
the corrective action (hook position reset) listed in "4. Parameter List."
•
When S9-02=1 [Hook Position Hold @Power down], oPL will not be output. However, to
maintain accuracy, regularly detect the origin position according to the information listed for
parameter S9-02.
Also detect the origin position when the wire length changes while the
power supply is turned OFF, such as when maintenance is performed.
◆
System Configuration
Figure 3.1 Example System Configuration of Wire Length Detection
Hoisting limit position
(Forward travel limit
activation position)
(Reverse travel limit
activation position)
Lifting/lowering shaft
drive
PG
PG option
Position 30% from hoisting limit
position
Analog output
PG cable
Motor cable
Lowering limit position
(Example: 3 V output at the
30% position.)
S9 Forward travel limit input
SN
SC
SP
FM
AC
S10 Reverse travel limit
input
Содержание CR700
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