H D 2 - D M - A / D M - A M
Product Specifications DM-AM
Subject to reasonable modifications due to technical advances.
Copyright Fuchs, Printed in Germany
Fuchs Group • Tel.: G49 621 776-0 • USA +1 330 4253555 • Sin65 67799091 • Internet http://www.pepperl-fuchs.com
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187630
4.5
LED Indication and Basic Troubleshooting
LED indication
Fault type
Fault clearance
LED PWR is off
Supply power failure:
no supply power is
available
or
supply power is less
than 20 V
or
supply power is high-
er than 30 V
USB-supply less than
150 mA?
• Use an externally-
supplied USB-Hub
Verify that the wiring is
secure:
• Tug on the wires/ca-
ble-clamps
• Measure the DC
voltage at the termi-
nal block connector
of the bulk power
supply or use the de-
livered AC/DC
adapter
LED COM/ERR is
flashing yellow
(on/off with 2 Hz)
A segment/field de-
vice maintenance re-
quired alarm is active.
LED COM/ERR is
flashing red (on/
off with 2 Hz)
A segment/field de-
vice alarm is active.
Connect diagnostic
PC and carry out a
complete system diag-
nosis
:
• DC unbalance
• jitter level too high
• noise level too high
Bus segment...
• ...badly terminated?
• ...miswired (shield
connections)?
• ...short circuit over-
load?
LED COMM/ERR
lights solid red
A hardware fault in-
side the DM-AM is
detected
Replace the device with
a new one!