10
Fault Finding
Fault Finding
Fault Possible
Cause
Check
No Power LED
J7 is removed:
Check J7 is fi tted.
Insuffi cient power:
Check Power Supply rating,
measure voltage and current
using a multi-meter.
Cable fault:
Check cable for breaks or use a
temporary cable.
HOST LED OFF
i-Net is powered off:
Check i-Net is powered on.
RS-485 cable is not
connected to i-Net:
Connect RS485 to RS485 port A
on the i-Net.
Cable is damaged:
Check cable using cable tester.
Termination is set
incorrectly:
Ensure it is correctly set on ALL
RS485 Devices.
RS485 cable is going in
incorrect RS485 port on
the i-Net:
Make sure RS485 is connected to
RS485 Port A.
REF is not connected to
GND at one end:
Connect REF wire to GND at one
point to give a GND reference.
RS485 Network is in a
STAR topology:
Ensure the RS485 Network
is NOT a STAR and is a BUS
Topology.
HOST LED Flashing
Duplicate RS485 Address:
Check addresses are all unique.
RS485 Network is in a
STAR topology:
Ensure the RS485 Network
is NOT a STAR and is a BUS
Topology.
Cable fault:
Check cable using cable tester.
No Reference:
Ensure the REF wire is connected
to GND at one point.
REF is connected to
multiple GNDs:
Remove all REF connected to
GND and ensure it is connected
to one GND only.
CS-4311 turns
off when relay
switches
No MOV installed:
Remove Lock from relay and test
again, if CS-4311 is OK, then
install MOV and retest.
CPU LED Flashing
Normal Operation:
Normal Operation.
HOST LED ON
Normal Operation:
Normal Operation.
Please refer to the i-Net Installation Instructions when installing
any devices on the RS485 bus.
