YASKAWA Varispeed V7 Instruction Manual page 221

Troubleshooting
Trouble
Communications
disabled with
DeviceNet master.
Although DeviceNet
communications
established, the
Inverter does not run
when an operation is
started by the
DeviceNet master.
The motor does not
operate when an
external operation
signal is input.
220
Cause
Communications cable is
incorrectly connected.
Baud rate is incorrectly set.
MAC ID is already used by another
device.
Terminator is incorrectly
connected or not connected on the
communications line.
DeviceNet master does not
operate.
Incorrect operation method is
selected.
Selection of operation Run command
selection (n003) is not set to
DeviceNet communications.
The operation method selection is
wrong.
The run command (n003) is not set to
Control Circuit Terminal.
A 3-wire sequence is in effect.
The multi-function input method
(n052) is set to 3-wire sequence, and
the S2 control terminal is not closed.
The frequency reference is too low.
The input frequency reference is
lower than the setting for the
min.output frequency (n016).
Local mode is in effect.
Corrective Actions
Check if the connector is incorrectly
connected or disconnected. Make
sure that the communications cable is
correctly connected.
Set the baud rate to the same value
as that of the DeviceNet master, and
turn ON the power supply again.
Change the MAC ID so that it will not
be the same as that of any other
device, and turn ON the power supply
again.
Check that the terminator is
connected correctly on the
communications line.
Check that the DeviceNet master is
always operating correctly.
Set Run command selection (n003) to
DeviceNet communications.
Set the run command (n003) to
Control Circuit Terminal.
To use a 3-wire sequence, make the
wiring so that the S2 control terminal
is closed. To use a 2-wire sequence,
set the multi-function input (n052) to a
value other than 3-wire sequence.
Input a frequency reference greater
than the min. output frequency
(n016).
Set the LO/RE selection of the digital
operator to RE.