-22-
No.EX
※※
-OMV0023
Troubleshooting table
Fault No.1
Fault
Probable cause
Recommended error handling
Recommended action
SI unit
ST LED is
OFF
Defective power
cable wiring for SI
unit operation
Check the condition of the power cable
wiring to the SI unit.
Re-tighten the power cable.
(Replace the cable if it is broken)
Correct the power cable wiring
layout.
SI unit operating
voltage is not
supplied
Check the condition of the supply voltage to
the SI unit.
Supply 24 VDC
10% to the SI
unit.
SI unit ST
LED is OFF
and S/E LED
is red ON
Node ID number is
outside range.
Check the Node ID setting.
Set the Node ID number from 1
to 239.
Fault No.2
Fault
Probable cause
Recommended error handling
Recommended action
SI unit
PWR (V)
LED is OFF
Defective power
cable wiring for the
solenoid valve
Check the condition of the power cable
wiring for the valve.
Re-tighten the power cable.
(Replace the cable if it is broken)
Correct the power cable wiring
layout.
Load voltage for the
valve is not
supplied
Check the condition of the supply voltage
for the valve.
Supply 24 VDC +10%/-5% to
the valves.
Fault No.3
Fault
Probable cause
Recommended error handling
Recommended action
SI unit L/A
LED is OFF
POWERLINK
communication
error between the
SI unit and the
upstream
POWERLINK
device.
Check the condition of the upstream
POWERLINK device.
Supply power to the upstream
POWERLINK device.
Check the BUS IN side communication
cable connections and check for broken
wires.
Tighten the communication
cable connection.
(Replace the cable if it is broken)
Check that there are no high voltage cables
or equipment that generates noise around
the communication cable and SI unit.
Take measures to keep the
communication cable and SI unit
away from noise sources.
Fault No. 4
Fault
Possible cause
Investigation method
Countermeasures
SI unit
ST LED is red
ON
Failure of SI unit.
Replace the SI unit and check that it
operates normally.
Replace the SI unit.
