Fuji Electric FRN355VG1S-4J [1007/1046] The motor runs in the opposite direction to the command

Fuji Electric FRN75VG1S-4J [1007/1046] The motor runs in the opposite direction to the command
13.5 If Neither an Alarm Code Nor "Light Alarm" Indication (
l-al
) Appears on the LED Monitor
13-31
Chap. 13 TROUBLESHOOTING
Possible Causes What to Check and Suggested Measures
Under vector control
with/without speed sensor
(15) Function code settings do
not agree with the motor
characteristics.
For exclusive motors for the FRENIC-VG: Check whether the data of
function code P02 matches the specification of the connected motor.
Î Correct the data of P02.
For other motors:
Î Perform auto-tuning.
[ 3 ] The motor runs in the opposite direction to the command.
Possible Causes What to Check and Suggested Measures
Under V/f control
Under vector control without
speed sensor
(1) Wrong wiring to the motor.
Check the wiring to the motor.
Î Connect the inverter output terminals U, V, and W to the motor input
terminals U, V, and W, respectively.
(2) The rotation direction
specification of the motor is
opposite to that of the
inverter.
The rotation direction of IEC-compliant motors is opposite to that of
incompliant motors.
Î Switch the FWD/REV signal setting.
(3) Incorrect setting of speed
command related function
code data.
Check the data of the speed command related function codes, referring to
the speed command block diagram given in the FRENIC-VG User's
Manual, Chapter 4.
Î Correct the data of the related function codes.
Under vector control with speed
sensor
(4) Wrong wiring of the PG.
Check the wiring to the motor.
Î Correct the wiring. (Refer to Chapter 3, Section 3.5.2 "Mounting
direction of a pulse generator (PG) and PG signals.")
[ 4 ] Speed fluctuation or current oscillation (e.g., hunting) occurs during
running at constant speed.
Possible Causes What to Check and Suggested Measures
(1) The analog speed command
fluctuates.
Check the signal status for the speed command with Menu #4 "I/O
CHECK" using the keypad.
Î Increase the filter constants (F83, E61 to E64) for the speed command.
Î Take measures to keep the speed command constant.
(2) An external potentiometer is
used for speed setting.
Check that there is no noise on the control signal wires connecting to
external sources.
Î Isolate the control signal wires from the main circuit wires as far as
possible.
Î Use shielded or twisted wires for control signals.
Check whether the external speed command potentiometer is
malfunctioning due to noise from the inverter.
Î Connect a capacitor to the output terminal of the potentiometer or set a
ferrite core on the signal wire. (Refer to Chapter 2.)
(3) Speed switching or
multistep speed command
was enabled.
Check whether the relay signal for switching the speed command is
chattering.
Î If the relay contact is defective, replace the relay.
(4) The wiring length between
the inverter and the motor is
too long.
Check whether auto-torque boost is enabled (P35, A55, A155).
Î Perform auto-tuning.
Î Under V/f control
, disable the automatic control system (select manual
torque boost), then check that the motor vibration stops.
Î Make the output wires as short as possible.

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