9492600990 4-3
DECS-150 Voltage and Current Sensing
If a machine is taken offline, then the secondary winding of that
machine’s cross-current compensation CT must be shorted.
Otherwise, the cross-current compensation scheme will not function.
Bus Voltage
Bus voltage monitoring enables bus failure detection and a 25 sync-check element, along with machine
and bus voltage matching. Three-phase bus sensing voltage is applied to DECS-150 terminals B1, B2,
and B3. This sensing voltage is typically applied through a user-supplied voltage transformer, but may be
applied directly. These terminals accept three-phase, three-wire connections at terminals B1 (A), B2 (B),
and B3 (C) or single-phase connections at B3 (C) and B1 (A).
The bus voltage sensing input accepts a maximum voltage of 600 Vac and has a burden of less than
1 VA.
The transformer primary and secondary winding voltages are entered in settings that the DECS-150 uses
to interpret the applied sensing voltage. Information about configuring the DECS-150 for the bus sensing
voltage is provided in the Configuration section of this manual.
Typical bus voltage sensing connections are illustrated in Figure 4-4.
Figure 4-4. Typical Bus Voltage Sensing Connections
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