Motor Rotates In The Wrong Direction - Omron VS mini J7 User Manual

Troubleshooting
The wiring on the Inverter
control circuit terminals is
incorrect.
The motor does not operate with input through the control circuit terminals.
(The frequency reference is zero or different from the set value.)
The frequency reference
setting is incorrect.
The Inverter is in local
mode.
The analog input gain or
bias setting is incorrect.
The motor stops during acceleration or when a load is connected.
The load may be too big.
The motor only rotates in one direction.
Reverse rotation-prohibit
is selected.
8-2-3

Motor Rotates in the Wrong Direction

The output wiring of the
motor is faulty.
124
The Inverter cannot check input signals if the input wiring on the control
circuit terminals is incorrect.
Operate the Digital Operator and check the input terminal status of multi-
function monitor U06.
The NPN or PNP input sequence is selectable. The NPN input sequence
is the default setting.
Refer to 2-2-2 Terminal Block and check that the setting of switch SW7 and
wiring are correct.
The analog input of frequency references is ignored with the Digital
Operator selected. The digital input of frequency references is ignored
unless the Digital Operator is selected.
Check that the setting in n03 for frequency reference selection coincides
with the actual method of giving frequency instructions.
Before using analog input, refer to 2-2-2 Terminal Block and check that the
setting of SW8 and the actual method (with voltage and current) of
providing frequency references are correct.
Frequency references can be provided only through key sequences on the
Digital Operator or with the FREQ adjuster to the Inverter in local mode.
Check the LO/RE indicator. If the display is "Lo," the Inverter is in local
mode. Press the Increment Key and set the Inverter to remote mode with
"rE" displayed.
If the above operation is not possible, the multi-function input will be set to
local/remote selection. In that case, the mode can be changed with the
multi-function input only. Turn the corresponding input terminal OFF so that
the Inverter will be set to remote mode.
Check that the frequency reference gain in n41 and frequency reference
bias in n42 are set according to the actual analog input characteristics.
The J7AZ has a stall prevention function and automatic torque boost
function, but the motor responsiveness limit may be exceeded if
acceleration is too rapid or if the load is too big.
Lengthen the acceleration time or reduce the load. Also consider
increasing the motor capacity.
If n05 for reverse rotation-prohibit selection is set to 1 (reverse run
prohibited), the Inverter will not accept reverse-rotation commands.
To use both forward and reverse rotation, set n05 to 0.
When the U/T1, V/T2, and W/T3 terminals of the Inverter are properly
connected to the T1(U), T2(V), and T3(W) terminals of the motor, the
motor operates in a forward direction when a forward rotation command is
executed. The forward direction depends on the maker and the motor type.
Therefore, be sure to check the specifications. Switching two wires among
the U/T1, V/T2, and W/T3 will reverse the direction of rotation.
Chapter 8-2