Fuji Electric FRENIC-ECO - The Motor Runs in the Opposite Direction to the Command; If the Speed Variation and Current Vibration (such as Hunting) Occur at the Constant Speed

6-4
Possible Causes What to Check and Suggested Measures
Measure the output current.
Î Lighten the load. (Adjust the damper of the fan or the value of the pump).
(In winter, the load tend to increase.)
(6) Overload
Check if mechanical brake is working.
Î Release the mechanical brake.
(7) Mismatch with the
characteristics of the
motor
In case auto-torque boost or auto-energy saving operation is under way,
check whether P02, P03, P06, P07, and P08 agree with the parameters o
f
the motor.
Î Set P02, P03, and P06 properly and perform auto-tuning in accordance
with P04.
Make sure that F43 (Current limiter (mode selection)) is set to "2" and check
the setting of F44 (Current limiter (level)).
Î If the current limiting operation is not needed, set F43 to "0" (disabled).
Decrease the value of torque boost (F09), then turn the power OFF and back
on again and check if the speed increases.
Î Adjust the value of the torque boost (F09).
(8) The current limiting
operation did not increase
the output frequency.
Check the data of function codes F04, F05, H50, and H51 to ensure that the
V/f pattern is right.
Î Match the V/f pattern values with the motor ratings.
(9) Bias and grain set
incorrectly.
Check the data of function codes F18, C50, C32, C34, C37, C39, C42, and
C44.
Î Readjust the bias and gain to appropriate values.
[ 3 ] The motor runs in the opposite direction to the command.
Possible Causes What to Check and Suggested Measures
(1) Wiring has been
connected to the motor
incorrectly.
Check the wiring to the motor.
Î Connect terminals U, V, and W of the inverter to the respective U, V, and
W terminals of the motor.
(2) Incorrect connection and
settings for run commands
and rotation direction
command (FWD) and
(REV)
Check the data of function codes E98 and E99 and the connection to
terminals [FWD] and [REV].
Î Correct the data of the function codes and the connection.
(3) The setting for the rotation
direction via keypad
operation is incorrect.
Check the data of function code F02 (Run command).
Î Change the data of function code F02 to "2: Enable
/
keys on
keypad (forward)" or "3: Enable
/
keys on keypad (reverse)."
[ 4 ] If the speed variation and current vibration (such as hunting) occur at the constant speed
Possible Causes What to Check and Suggested Measures
(1) The frequency command
fluctuated.
Check the signals for the frequency command with Menu #4 "I/O Checking"
using the keypad.
Î Increase the filter constants (C33, C38, and C43) for the frequenc
y
command.