Appendix A - ACS380 in crane applications 539
Extended run time
The Extended run time function minimizes the delay between consecutive start
commands. After the brake closes and the brake close delay time elapses, the
extended run time function keeps the motor magnetized for a defined time period.
During the delay period, the motor is kept magnetized (modulating), to be ready for
immediate restart. Because of this action, the next start can be considerably faster by
skipping certain start sequence steps, such as magnetization (page
77
) and torque
proving (page
536
).
The function activates when the following parameters are set:
•
44.06
Brake control enable
=
Selected
•
44.211
Extended runtime
> 0.
•
44.212
Extended runtime sw
(Bit 0) = 1. After the brake closes, this modulates the
drive for the defined time in parameter
44.211
Extended runtime
.
If the drive trips during the extended run time operation, the function timer resets.
Refer the
Crane brake control timing diagram
(page
533
), to see the operation of the
Extended run time function.
Notes
:
• The Extended run time function is available only in vector control mode (see page
54
) when the drive is in Remote mode and only when parameter
21.03
Stop mode
is set as
Ramp
.
• If you enable Post magnetization function at the same time, post magnetization
function executes first, and when post magnetization time elapses, the extended
runtime should be set for the remaining time if extended runtime is longer than
post magnetization time.
WARNING:
Make sure the motor is capable of absorbing or dissipating the
thermal energy generated by continuous magnetization, for example by forced
ventilation.
Settings
Parameters:
44.211
Extended runtime
Signals:
44.01
Brake control status
,
44.212
Extended runtime sw
Warnings: -
Faults: -
ACS380 FW.book Page 539 Friday, May 4, 2018 4:18 PM
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