INVT Goodrive350-19 Series Operation Manual page 74

Goodrive350-19 Series VFD for Crane
C. During the stop process, you can enable the maintenance frequency so that the device runs at a
low speed within a small period of time before the stop, since impact may be caused if the device
directly stops at a high speed. The maintenance frequency for stop can be enabled by setting P90.29
to a value greater than 0. You can set the maintenance frequency through P90.28. The timing
diagram is as follows:
FWD
running
command
FWD
brake
release
frequency
FWD output
frequency
Brake
control
signal
T1: Delay before forward brake release P90.20 T3: Delay before forward brake closing P90.24
T2: Delay after forward brake release P90.22
T0: Maintenance frequency hold time for DEC stop P90.29
Maintenance frequency: Maintenance frequency for DEC stop P90.28
FWD brake release/closing frequency: P90.16/P90.18
D. If two segments of ACC/DEC time are used, you can increase ACC/DEC time at low frequency
running to ensure smoothness at low-frequency start or stop. You can set P08.19 (Switching
frequency of ACC/DEC time) to a value greater than 0 to enable two segments of ACC/DEC time and
then the ACC/DEC time 1 (P00.11 and P00.12) and ACC/DEC time 2 (P08.00 and P08.01) are used.
Run
Frequency
T1 T2
of grade 1
Torque
verification OK
Close
or 2
Maintenance
frequency
Release
T4: Delay after forward brake closing P90.26
-62-
Commissioning guidelines
T3 T4
T0
Close
FWD
brake
closing
frequency