H D 2 - D M - A / D M - A M
Product Specifications HD2-DM-A
Subject to reasonable modifications due to technical advances.
Copyright Fuchs, Printed in Germany
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LED indication Fault type
Remedy
PRI PWR and/or
SEC PWR LEDs
are off
Supply power failure:
possible reasons:
• no primary and/or
secondary sup-
ply power is avail-
able
• supply power is
less than 19.2 V
• supply power is
higher than 35 V
(32 V if at least
one non-isolated
power module is
plugged-in or
configured)
Connect diagnostic PC and carry out
a complete system diagnosis:
Bulk power supply switched on and
healthy?
Verify that the wiring is secure:
• Tug on the wires/cable-clamps
• Measure the DC voltage at the ter-
minal block connector to the bulk
power supply
One segment
LED is flashing
yellow (on/off
with 2 Hz)
A segment/field de-
vice maintenance re-
quired alarm is active.
All segment
LED are flashing
yellow (on/off
with 2 Hz)
A system mainte-
nance required alarm
is active.
One segment
LED is flashing
red (on/off with
2 Hz)
Any segment/field de-
vice alarm is active.
Connect diagnostic PC and carry out
a complete system diagnosis:
• DC unbalance
• too high jitter level
• too high noise level
Bus segment...
• ...badly terminated?
• ...miswired (shield connections)?
• ...short circuit overload?
Power supply/conditioner modules
healthy and well mounted?
All segment
LEDs are flash-
ing red
(on/off with 2
Hz)
Any system alarm is
active
Connect diagnostic PC and carry out
a complete system diagnosis:
Bulk power supply voltage correct?
Board type configuration correct?
Board redundancy configuration cor-
rect?
Any (or all) seg-
ment LEDs
lights solid red
A hardware fault in-
side HD2-DM-A is de-
tected
Replace the device with a new one!