Points For Attention; Switching From Lifting In Closed-Loop Vector Control To Open-Loop Vector Control - INVT Goodrive350-19 Series Operation Manual

Goodrive350-19 series VFD for crane
Function
code
P91.26 Downward torque limit 1
Downward restricted
P91.27
P91.28 Downward torque limit 2
Downward restricted
P91.29
Zero servo protection
P93.02
Note: The macro parameter table does not contain some parameters that are factory default
parameters.

5.2.4 Points for attention

1. If you only want to check whether the VFD runs properly, set P90.00=0 (Common mode).
2. If you perform empty-load commissioning, set P90.00 to 2 (Lifting in closed-loop vector control),
set P11.08 to 0x000 to disable underload protection, and set P90.14 and P90.15 to 0 to prevent
the torque verification fault reporting caused by empty load. In addition, if no external braking
resistor is connected, you need to increase the ACC/DEC time to prevent the bus overvoltage
fault reporting caused by too fast stop.
3. If there is a brake feedback signal, set P25.02 to 75, and the macro has set this parameter by
default. In addition, set P90.31 to 1. Since the closed-loop mode is used, the brake current
monitoring function is automatically enabled after the setting, and you can set P90.34 to set
whether the reference speed is used if the brake status is incorrect. If there is no brake feedback
signal, set P90.31 to 0 to prevent the misreporting of a brake feedback fault.
4. In closed-loop mode, brake slip verifying is enabled by default. If you need to check the running
status of the VFD without a brake, set P93.01 to 0 to disable brake slip verifying.
5. During onsite commissioning, if the VFD terminal signal upward/downward running command is
inconsistent with the load lifting/lowering direction, adjust any two phase sequences of VFD
output terminals U, V, and W.
6. If PLC control is used, speed signal and other input and output signal functions need to be
adjusted according to the actual control logic.
7. This macro can meet the requirements of most lifting application cases, and the performance
parameters have been optimized and do not need to be adjusted in most cases. If an exception
occurs, see the function parameter chapter for adjustment or contact the technical support.

5.2.5 Switching from lifting in closed-loop vector control to open-loop vector control

In closed-loop vector control mode, if an encoder exception occurs, you can switch to open-loop
vector control by setting P90.03=5, the brake timing sequence of which is different from that of
Name
frequency 1
frequency 2
mode
Setting
50%
50hz
45%
70hz
1 Zero servo input slows down.
-45-
Commissioning guidelines
Remarks