6.6 High-Speed Serial Communication-Capable Terminal Block
6-137
Chap. 6
CONTROL OPTIONS
(3) Checking the optical communications link
Unless the optical communications link is established in the multiplex system, the RDY signal (Inverter ready
to run) cannot be established so that the inverter does not accept a run command (FWD, REV). If this happens,
no alarm is detected.
Whether the optical communications link is established can be checked with the following.
• Digital signal MTS status (Multiplex system communications link being established)
When the optical communications link between master and slaves is normally established, all inverter
units in the multiplex system turn ON the MTS signal.
If the optical communications link is not established, check the following.
(1) Configuration of function codes on each inverter (refer to Section 6.6.6).
(2) Optical cable
1) No connection or incomplete insertion to the connector.
2) Rolled up with curvature of 30 mm or less. Bent.
3) Mismatch between the color of the optical cable plug and that of the connector (gray or dark blue)
on the printed circuit board.
4) No loop formed. Signals sent from the master should be looped back.
6.6.7.2 Operation method
・ Give the operation and speed commands to the master only.
・ Connect the PG and NTC feedback signals to the master only.
(PG connection is not necessary for sensorless operation.)
・ If the feedback is supplied to the slave(s) only, correct operation is not possible.
• Operation and command input
Give the commands (speed, torque,
torque limiting) to the master inverter
unit only. Optically linked slave
inverter units can be considered as
hardware which only controls current.
The operation method and command
input method are the same as the
standard product.
Figure 6.6.10
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