Fuji Electric FRENIC-MEGA, Instruction Manual

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< Modification of motor control function code data >
Modifying the current function code data sometimes can solve an insufficient torque or overcurrent incident. The table below lists
the major function codes to be accessed. For details, see Chapter 5 "FUNCTION CODES" and Chapter 6 "TROUBLESHOOTING."
Function
code
Name Modification key points
Drive control
V/f
PG
V/f w/o
PG
w/
PG
f 07
Acceleration time 1
If the current limiter is activated due to a short acceleration time
and large drive current, prolong the acceleration time.
Y Y Y Y
f 08
Deceleration time 1
If an overvoltage trip occurs due to a short deceleration time,
prolong the deceleration time.
Y Y Y Y
f 09
*
Torque boost 1
If the starting motor torque is deficient, increase the torque boost.
If the motor with no load is overexcited, decrease the torque
boost.
Y Y N N
f 44
Current limiter
(Mode selection)
If the stall prevention function is activated by the current limiter
during acceleration or deceleration, increase the operation level.
Y Y N N
p 09
*
Motor 1
(Slip compensation gain
for driving)
For excessive slip compensation during driving, decrease the
gain; for insufficient one, increase the gain.
Y N Y N
p 11 *
Motor 1
(Slip compensation gain
for braking)
For excessive slip compensation during braking, decrease the
gain; for insufficient one, increase the gain.
Y N Y N
h 80 *
Output current fluctuation
damping gain 1 (For
motor 1)
If the motor vibrates due to current fluctuation, increase the
suppression gain.
Y Y N N
Y: Modification effective N: Modification ineffective
If any problem persists under "V/f control with speed sensor," "dynamic torque vector control with speed sensor," or "vector control
with/without speed sensor," then modify the following function code data.
The drive controls mentioned above use a PI controller for speed control. The PI constants are sometimes required to be modified
because of the load inertia. The table below lists the main modification items. For details, see Chapter 5 "FUNCTION CODES" and
Chapter 6 "TROUBLESHOOTING."
Function
code
Name Modification key points
d 01
*
Speed control 1
(Speed command filter)
If an excessive overshoot occurs for a speed command change, increase the filter
constant.
d 02 *
Speed control 1
(Speed detection filter)
If ripples are superimposed on the speed detection signal so that the speed control
gain cannot be increased, increase the filter constant to obtain a larger gain.
d 03
*
Speed control 1
P (Gain)
If hunting is caused in the motor speed control, decrease the gain.
If the motor response is slow, increase the gain.
d 04
*
Speed control 1
I (Integral time)
If the motor response is slow, decrease the integral time.