INVT Goodrive350-19 Series Operation Manual page 334

Goodrive350-19 Series VFD for Crane
Function
Name
code
P91.51 Pre-torque offset In closed-loop mode:
P91.52 Drive-side gain
P91.53 Braking-side gain
P91.54 Pre torque direction
Description

If the given pre-torque changes during
operation, the
compensation value is the difference
between the present given value and the
last pre-torque given value. A negative
change value indicates negative torque
compensation. When the pre-torque given
value is 0, the actual pre-torque is not the
amount of change from the last time, but
the pre-torque is invalid.

As long as the operation command is
given, the pre-torque compensation value
will take effect even if the given frequency
is 0Hz.

When the synchronous motor is started for
the first time, the pre-torque compensation
function will not take effect until the present
magnetic pole angle is found through static
identification.
Setting pre torque is to output the torque
corresponding to load weight in advance so as
to reduce the start impact and prevent reserve
driving or slip during start.
Setting P91.51 is to eliminate the impact of
mechanical counterweight for lifting; pre-torque
compensation is directly performed if there is no
mechanical counterweight.
Pre-torque compensation value = K*(P91.50 –
P91.51), in which K= P91.52 when the motor is
in electromotive state and K= P91.53 when the
motor is in power generation (braking) state.
Setting range of P91.51: -100.0–100.0%
Setting range of
0.000–7.000
0–1
0: Forward
1: Reverse
-322-
actual pre-torque
P91.52 and P91.53:
Function parameters
Default Modify
○
0.0%
○
1.000
○
1.000
○
0