INVT Goodrive350-19 Series Operation Manual page 73

Goodrive350-19 Series VFD for Crane
2. Adjust braking comfort, which can be implemented by using the following methods.
A. In I/F mode, you can decrease the brake release frequency and brake closing frequency and
adjust the T1–T8 delay parameters in the timing sequence so that the impact is reduced. Note that
the brake release frequency and brake closing frequency are greater than P01.01 (Starting frequency)
and P01.15 (Stop speed) in most cases.
B. During the reverse-running stop, you can apply the forward torque, that is, for reverse-running start,
you can perform forward brake release and then perform reverse running; for reverse-running stop,
you can switch reverse running to forward running, close the brake, and then perform forward-running
stop. This ensures there is no slip is felt during reverse start or stop. Forward torque is enabled by
setting P90.05. The timing sequence is as follows:
(FWD/REV)
Running
command
release
frequency
FWD output
P90.16
frequency
Brake control
signal
release
frequency
REV output
P90.17
frequency
Brake
feedback
signal
Brake
action
FWD
T1 T2
brake
Torque verifying is OK
Close
REV
T5 T6
brake
Torque verifying is OK
T1: Delay before forward brake release P90.20 T3: Delay before forward brake closing P90.24
T2: Delay after forward brake release P90.22
T5: Delay before reverse brake release P90.21 T7: Delay before reverse brake closing P90.25
T6: Delay after reverse brake release P90.23
Frequency of
grade 1 or 2
Release
Frequency of
grade 1 or 2
T4: Delay after forward brake closing P90.26
T8: Delay after reverse brake closing P90.27
-61-
Commissioning guidelines
T3 T4
FWD brake
closing
frequency
P90.18
Close
T7 T8
REV brake
closing
frequency
P90.19