H D 2 - D M - A / D M - A M
Use Cases and Troubleshooting
Subject to reasonable modifications due to technical advances.
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Module type/mis-
match alarms
• Check power supply module configuration
• Check that all power supply modules are cor-
rectly installed
• Check that the configured power supply mod-
ules (isolated/non-isolated) are used
• Check that on a redundant motherboard for
each segment two power supplies of identical
type (isolated/non-isolated) are plugged in
• If it is intended to use a changed module config-
uration, adapt the module configuration
Segment voltage
alarms
• Check that the correct power supply module
type is used (17 V, 23 V, 30 V)
• Check that the power supply modules work cor-
rectly
• Modify the module configuration if it is intended
to use a changed module configuration
Segment current
warnings
• Check that the setup current is correct for the
connected slaves
• Check that no additional load has been connect-
ed to the bus segment
• Check that all connected slaves are working cor-
rectly and that there is no hardware failure in-
creasing the current consumption
• Check that there is no miswiring (e. g. short cir-
cuit at the end of a long bus cable)
• Check that there is no ingress of dirt water caus-
ing a resistive load on the bus segment (e. g. in
a slave housing, junction box etc.)
Fault Type
Fault Clearance
