System Operation
Copyright © 2007-2011 Eaton Corporation. All Rights Reserved.
IPN 997-00012-50H November 2011
37
Contactor controlled by
LVD 1 - low priority load
disconnect (disconnects
first).
Contactor controlled by
LVD 2 - battery
disconnect (only
disconnects after LVD 1)
Connections to high
priority loads (for example
transmission equipment).
Connections to low
priority loads.
Connection to the SC200
system controller via the
I/O board.
More complex arrangements with up to 16 contactors and a selection of disconnection criteria,
are possible with the SC200 system controller. The exact arrangement(s) used in a particular
Eaton dc power system will be described in the Installation and Operation Guide.
Characterization
If auxiliary contacts are fitted to the LVD contactor(s)*, then the LVD Characterization process
determines the optimum operating voltages to suit the contactor(s) coil voltage. These values
are stored in the SC200 and on the I/O board.
An
LVD Characterization Error
alarm will be activated if the SC200 detects that the
characterization values stored in the SC200 and on the I/O board are different. This happens
when:
The SC200 is replaced.
The I/O Board is replaced.
Both the SC200 and the I/O Board are replaced.
LVD Characterization Error
alarms can only be cleared from the SC200 front panel, not using
DCTools/Web.
To clear the alarm when the SC200 is replaced, on the SC200 go to
Alarms
, select the
LVD
Character. Err.
active alarm and press
Details
, select
Clear
and press
Enter
, select
Characterize
with IOB Values
and press
Save
.
To clear the alarm when the I/O Board is replaced, on the SC200 go to
Alarms
, select the
LVD Character. Err.
active alarm and press
Details
, select
Clear
and press
Enter
, select
Characterize with SC Values
and press
Save
.
To clear the alarm when both the SC200 and the I/O Board are replaced, go to
Alarms
,
select the
LVD Character. Err.
active alarm and press
Details
, select
Clear
and press
Enter
,
select
Characterize Contactor
and press
Start
.
When a contactor is re-characterized it will disconnect and re-connect several times. Refer to
Maintenance in the dc power system Installation and Operation Guide for full instructions.
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