ABB OMD800 Installation And Operating Instruction page 34

34
A U T O M AT I C C O N T R O L U N I T, O M D 8 0 0
Output relay X24 (see control circuit diagram, Section 5.2) operates in two cases:
1. Secondary Load parameter value is Opening Only or Opening Pulse and OMD800 automatic control
unit performs switching sequence
2. Secondary Load parameter value is Opening and Closing or Opening/Closing Pulse and OMD800
automatic control unit performs switching sequence or back switching sequence
System Configuration
Ext VT Primary Voltage
Ext VT Secondary Voltage
Secondary Load
Figure 7.17 Secondary Load, Not Used is the default
Output relay X24 de-actives in case of loss of power. If the device controlling the secondary
load is powered it may close when the output relay X24 de-activates. Use Switch II auxiliary con-
tact type OA1G10 in parallel with output relay X24 to prevent unwanted close command, see the
rightmost figure above.
Generator Usage
User can choose No Generator, when generator is not used or Generator in Use, when it is used in the
Line 2 (LN 2) - Switch II. No Generator is the default.
System Configuration
Ext VT Secondary Voltage
Secondary Load
Generator Usage
Figure 7.18 Generator Usage, No Generator is the default
Generator should always be connected to the Line 2 (LN 2) - Switch II. When generator is in
use, line priority can't be set to value Line 2 (LN 2) - Switch II.
Line Priority
User can select the Line Priority to the Line 1 (LN 1) - Switch I, Line 2 (LN 2) - Switch II or No Line Priority.
Line 1 (LN 1) - Switch I is the default.
System Configuration
Secondary Load
Generator Usage
Line Priority
Figure 7.19 Line Priority, Line 1 - Switch I is the default
Secondary Load
8/13
Cancel
9/13 Generator Usage
Cancel
10/13 Line Priority
Line 1 – Switch I
Cancel
Not Used
OK Edit
No Generator
OK Edit
OK Edit
Secondary load
X24 Switch II
auxiliary
contact