Brake Function In Torque Control - INVT Goodrive350-19 Series Operation Manual

Goodrive350-19 series VFD for crane
Function
code
Enabling speed reference under
P90.34
Speed reference under brake
P90.35
P90.37
forward/reverse switchover
P93.00 Brake slip speed threshold
P93.01 Brake slip fault delay

5.11.5 Brake function in torque control

If brake control (P90.04=1) is enabled when the torque mode is used (P03.32=1), the braking logic in
the torque mode is enabled. When the VFD runs, the set torque is set based on (P90.42+5.0%). The
FWD/REV frequency upper limit in the torque mode is given by the FWD/REV brake release
frequency, and the output torque is detected in real mode. If the output torque is equal to or greater
than the preset brake opening torque (P90.42), a delay before brake release is performed. When the
delay is reached, brake output is performed. Then a delay after brake release is performed. When the
delay is reached, the brake timing ends. The set torque and the FWD/REV frequency upper limit in
the torque mode are restored to the normal values. That is, the parameters in P03 determine that the
VFD runs in the normal torque mode.
During stop, the VFD automatically switches from the torque mode to the speed mode and then
decelerates to stop. Then the brake logic uses the brake closing logic in the speed mode.
The brake timing diagram is as follows:
Name
brake status error
status error
Brake selection for
Description
0–1
0: Disable (The brake feedback fault
is reported.)
1: Enable (The brake feedback alarm
is also reported.)
0.00–50.00Hz
0–1
0: No switchover
1: Switchover
1.00–5.00Hz
0.000–5.000s
The value 0 indicates brake slip is not
detected, while a non-zero value
indicates brake slip is detected.
-81-
Commissioning guidelines
Default
0
5.00Hz
0
1.00Hz
0.500s