H D 2 - D M - A / D M - A M
Product Specifications HD2-DM-A
Subject to reasonable modifications due to technical advances.
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3.5
HD2-DM-A Voltage Free Contact Activation
All Power Hub Motherboards (excepting MB-FB-1R) containing a com-
mon alarm voltage free contact. By affecting a relay general failure sta-
tus is given, for further information see chapter „Fieldbus Power Hub Ba-
sic Diagnostics“ at the Fieldbus Power Hub System Manual. As the
Basic Diagnostic Module the Advanced Diagnostic Module HD2-DM-A
sets the relay contact, too. While no alarm occurs the contact is closed.
It opens when a maintenance alarm limit value is violated.
The check outs with the corresponding relay status are given in the table
below.
Relay status
Check out
Maintenance alarm
Out-of-Specification
alarm
Bulk Power Sup-
ply Voltage
High / Low
•
•
Segment
Voltage
High / Low
•
•
Segment
Current
High / Low
•
n.a
.
Power Supply
Module mis-
match
n.a
.
•
Power Supply
Module failed
n.a
.
•
Fieldbus Signal
level High / Low
•
•
Unbalance
•
•
Noise
•
•
Jitter
•
•