546 Appendix A - ACS380 in crane applications
Crane stop limit function
The crane stop limit function stops the crane movement safely when it reaches the
end position. You can use the stop limit function in both horizontal (long travel trolley)
and vertical (hoist) movement.
The stop limit function has two stop limits:
1. Forward stop limit (
76.04
) – for forward (positive) direction.
2. Reverse stop limit (
76.06
) – for reverse (negative) direction.
For forward and reverse stop limit, the input is wired to the forward and reverse limit
switch respectively.
If one of the two limits is active, the function activates a stop command and stops the
movement according to the stop mode selection (
76.11
). The two limits are
independent of each other.
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 valid when the crane
movement has not reached the limit.
The following steps describe the forward stop limit operation in the forward lifting
(positive) direction. The same can be applied for reverse stop limit in the reverse
lowering (negative) direction:
• If the forward stop limit is activated while the drive is running in the forward (up)
direction, the function stops the motor according to the selected stop mode
(
76.11
)
- If limit ramp stop mode is selected (
76.11
), the drive decelerates according to
the defined limit ramp stop time (
76.12
)
- If limit normal stop mode is selected (
76.11
), the drive stops according to the
selected stop mode (
21.03
).
• When the forward stop limit is active, the drive generates a warning
D205
Forward stop limit
.
• You can run the motor only in the reverse direction when the forward stop limit is
active.
Typically, for the crane stop limit function, the parameters are set as follows:
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
ACS380 FW.book Page 546 Friday, May 4, 2018 4:18 PM
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