Fuji Electric FRENIC MEGA G2 Series - Page 652

6.5 Other Errors
6-38
[ 6 ] Motor is not accelerated or decelerated according to set-up acceleration or
deceleration times
Possible cause
Check and measures
(1) The inverter runs the motor with
S-curve or curvilinear pattern.
Check the data of function code H07 (Curve acceleration/ deceleration).
➔ Set linear acceleration/deceleration. (H07=0)
➔ Shorten the acceleration/deceleration times (F07, F08, E10 through
E15).
(2) The current limiting operation
prevented the output frequency
from increasing (during
acceleration).
Make sure that F43 (Current limiter (Mode selection)) is set to 2, then
check that the setting of F44 (Current limiter (Level)) is reasonable.
➔ Readjust the setting of F44 to appropriate value, or disable the
function of current limiter with F43.
➔ Increase the acceleration/deceleration times (F07, F08, E10
through E15).
(3) The anti-regenerative control is
enabled (during deceleration).
Check the data of function code H69 (Anti-regenerative control (Mode
selection)).
➔ Increase the deceleration time (F08, E11, E13, and E15).
(4) Overload
Measure the inverter output current.
➔ Reduce the load. For fans or pumps, decrease the frequency limiter
Upper limit (F15). In winter, the load tends to increase. In winter, the
load tends to increase.
(5) Torque generated by the motor
was insufficient.
Check that the motor starts running if the value of the torque boost
(F09*) is increased.
➔ Increase the value of the torque boost (F09*).
(6) An external frequency
command potentiometer is used
for frequency setting.
Check that there is no noise in the control signal wires from external
sources.
➔ Keep the main circuit wiring and control circuit wiring as far apart as
possible.
➔ Use shielded or twisted wires for control signals.
➔ Connect a capacitor to the output terminal of the potentiometer or
insert a ferrite core on the signal wire. (See Chapter 2.)
(7) The output frequency is limited
by the torque limiter.
Check whether the data of torque control levels (F40, F41, E16, E17)
are set to appropriate values. Also, check whether torque limit 2/1
switching signal TL2/TL1 is correct.
➔ Correct the data of F40, F41, E16 and E17 or reset them to the
factory defaults.
➔ Set the TL2/TL1 correctly.
➔ Increase the acceleration/deceleration times (F07, F08, E10
through E15).
(8) The specified acceleration or
deceleration time was incorrect.
Check the terminal commands RT1 and RT2 for acceleration/
deceleration times.
➔ Correct the RT1 and RT2 settings.
 The explanations for function codes with an asterisk (*) are limited to motor 1. If using motor 2 to 4, replace
with the relevant function codes in Chapter 5 "Table 5.3-21 Function codes to be switched".