Appendix A - ACS380 in crane applications 549
For both forward and reverse limit, the active and inactive conditions are applicable
as follows:
• The limits are active when the limit input to the drive is False (0), i.e. when the
normally-closed limit switch is open.
• The limits are inactive when the limit input to the drive is True (1), i.e. the
normally-closed limit switch is closed. This condition is applicable for the normal
operation of the crane.
Slowdown with direction
The control program activates this mode when you have the same signal source in
the parameters
76.05
Forward slow down limit
and
76.07
Reverse slow down limit
and any of these source signals is set to False (0).
On activation of slowdown with direction, the function limits the speed reference to
the slowdown reference limit (
76.08
/
76.09
) in the direction of motion at the time of
activation. As long as the supply voltage is not switched off, the drive remembers the
direction of motion and allows full speed in the opposite direction.
If you activate the slowdown command after the drive stops, the function allows only
slow speed in both directions. The function also limits the speed reference in both
directions if you activate the slowdown command when the drive powers up.
Typically, for the crane slowdown function, parameters are set as follows:
Settings
Parameters:
76.01
Limit to limit control status
,
76.02
Enable limit to limit control
,
76.03
Limit to limit trigger type
,
76.05
Forward slow down limit
,
76.07
Reverse slow down
limit
,
76.08
Slow down speed
,
76.09
Slow down frequency
Signals:
09.01
Crane SW1
,
09.03
Crane FW1
Warnings:
D201
Forward slow down limit
,
D202
Reverse slow down limit
Faults: -
For control connection diagram, see
Configuring slowdown with two limits and stop
limit logic
on page
527
.
No.
Name
Value
76.01
Limit to limit control status
(Actual status of limit control)
76.02
Enable limit to limit control
Selected
76.03
Limit to limit trigger type
Level low
76.05
Forward slow down limit
DIO1
76.07
Reverse slow down limit
DIO1
76.08
Slow down speed
300 rpm
76.09
Slow down frequency
0.00 Hz
ACS380 FW.book Page 549 Friday, May 4, 2018 4:18 PM
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