95
E3NW-CRT
User’s Manual
Sec
tion 5
App
e
ndic
e
s
Section 5
Troubleshooting
Troubleshooting
The following table lists the possible indicator status, possible causes, and remedies for
problems.
Status
Possible cause
Remedy
MS and NS
indicators not lit
Power is not being supplied.
Supply power from the CompoNet communications
connector.
The power voltage is outside
the allowable range.
Maintain the power voltage within the allowable range.
The E3NW-CRT Unit is faulty.
Replace the E3NW-CRT Unit.
MS indicator lit
red
The E3NW-CRT Unit is faulty.
Replace the E3NW-CRT Unit.
MS indicator lit
green
NS indicator
flashing green
Waiting for a CompoNet
communications connection.
Check the following items and restart the Unit.
• Are the cables the correct length (main and auxiliary
lines)?
• Are any cables short-circuited, disconnected, or loose?
• Are the cables wired correctly?
• Is the terminating resistance set only at the ends of the
main line?
• Is there too much noise?
• Is the master turned ON?
The E3NW-CRT Unit is faulty.
Replace the E3NW-CRT Unit.
MS indicator lit
green
NS indicator lit
red
CompoNet is in the Busoff
state.
Check the following items and restart the Unit.
• Are the cables the correct length (main and auxiliary
lines)?
• Are any cables short-circuited, disconnected, or loose?
• Is the terminating resistance set only at the ends of the
main line?
• Is there too much noise?
The node address is the same
as another node.
Set the address correctly.
The E3NW-CRT Unit is faulty.
Replace the E3NW-CRT Unit.
MS indicator lit
green
NS indicator
flashing red
A communications timeout has
occurred.
Check the following items and restart the Unit.
• Are the cables the correct length (main and auxiliary
lines)?
• Are any cables short-circuited, disconnected, or loose?
• Is the terminating resistance set only at the ends of the
main line?
• Is there too much noise?
The E3NW-CRT Unit is faulty.
Replace the E3NW-CRT Unit.
SS indicator not
lit
No Sensor Amplifier Units are
connected.
Connect the Sensor Amplifier Units correctly.
The Sensor Amplifier Unit next
to the Sensor Communications
Unit is faulty.
Replace the Sensor Amplifier Unit next to the Sensor
Communications Unit.
The E3NW-CRT Unit is faulty.
Replace the E3NW-CRT Unit.