System Operation
Copyright © 2007-2011 Eaton Corporation. All Rights Reserved.
IPN 997-00012-50H November 2011
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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