User`s manual

36
How to check an error indicated by the LEDs.
L.RUN: Lit when the refleshed data is successfully received. Extinguished if data communications are
interrupted for a specified period of time.
SD : Lit when sending data is "1".
RD : Lit when detecting the receiving data carrier.
L.ERR: Lit when the local data has a CRC abort error.
The following table describes the causes and corrective actions of the failures that can be determined according to the
LED status of the SI-C card in a system configuration where one master is connected to one inverter.
LED Display
L.RUN SD RD L.ERR
Meaning Corrective Actions
Normal but an error is occurring. Remove the influence
of noise.

Communications are functioning normally. —

Hardware error Turn the power
supply OFF and then
ON again.
 
Hardware error Turn the power
supply OFF and then
ON again.

A CRC error occurred, and the SI-C card
cannot replay.
Remove the influence
of noise.
 
Local data cannot be received. Confirm the PLC
program.
 
Hardware error Turn the power
supply OFF and then
ON again.
  
Hardware error Turn the power
supply OFF and then
ON again.

Polling response is made but an CRC error
occurred in refleshing the data.
Remove the influence
of noise.
 
Hardware error Turn the power
supply OFF and then
ON again.
 
Hardware error Turn the power
supply OFF and then
ON again.
  
Hardware error Turn ON the power
supply again.
Station
No. 1
Inverter
Master
Unit
Powe
r
CPU