Fuji Electric FRENIC-MEGA - Modification of Motor Control Function Code Data

4-15
Chap. 4 RUNNING THE MOTOR
-------------------------------------------------------------- Test Run Procedure --------------------------------------------------------------
(1) Turn the power ON and check that the reference frequency
*000 Hz is blinking on the LED monitor.
(2) Set a low reference frequency such as 5 Hz, using
/ keys. (Check that the frequency is blinking on the LED monitor.)
(3) Press the
key to start running the motor in the forward direction. (Check that the reference frequency is displayed on the
LED monitor.)
(4) To stop the motor, press the
key.
< Check points during a test run >
• Check that the motor is running in the forward direction.
• Check for smooth rotation without motor humming or excessive vibration.
• Check for smooth acceleration and deceleration.
When no abnormality is found, press the
key again to start driving the motor, then increase the reference frequency using
/
keys. Check the above points again.
If any problem is found, modify the function code data again as described below.
Depending on the settings of function codes, the motor speed may rise to an unexpectedly high and dangerous
level, particularly, under vector control with/without speed sensor. To avoid such an event, the speed limiting
function is provided.
If the user is unfamiliar with the function code settings (e.g., when the user starts up the inverter for the first time),
it is recommended that the frequency limiter (high) (F15) and the torque control (speed limit 1/2) (d32/d33) be
used. At the startup of the inverter, to ensure safer operation, specify small values to those function codes at firs
t
and gradually increase them while checking the actual operation.
The speed limiting function serves as an overspeed level barrier, or as a speed limiter under torque control. Fo
r
details of the speed limiting function, refer to the FRENIC-MEGA User's Manual.
-------------------------------------------------------------------------------------------------------------------------------------------------------
< 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."
Drive control
Function
code
Name Modification key points
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, 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.