536 Appendix A - ACS380 in crane applications
Timing diagram
This timing diagram shows the operation of the Torque proving and Brake system
check functions.
Brake system checks – Torque proving
Torque proving makes sure that the drive can produce torque before it releases the
brake and starts the crane operation. The function is mainly intended for hoist drives,
but you can also activate it in drives that control other crane motions if the drives uses
encoder feedback.
Torque proving gives a positive or negative torque reference against a closed
mechanical brake. If torque proving is successful, in other words, the actual torque of
the drive reaches the reference level (
44.203
), the drive lets the brake open and
starts the next step in the starting sequence.
Torque (%)
t (s)
t (s)
t (s)
t (s)
t (s)
t
t (s)
Speed (rpm)
Started & magnetized
D100
Torque prove
Brake slip speed limit
(
44.205
)
26.02
01.01
D101
Brake slip
* Torque proving reference is held for the brake system check time
even though the torque has been proved.
*
Torque prove ok (
09.01
b1)
and Brake open cmd
(
44.205
b0)
01.10
a
a
a
a
a
a
a
a
b b
b b
Symbol Description
a
Brake system check time (
44.204
)
b
Brake slip fault delay (
44.206
)
Torque prove ok (
09.01
b1) and Brake open cmd
(
44.01
b0)
ACS380 FW.book Page 536 Friday, May 4, 2018 4:18 PM
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