Basler Electric DECS-400 - Manual (Page 139)

9369700990 Rev R 127
Field Isolation Module Terminations
Field Isolation Module terminations consist of screw terminals and a D-type connector.
Input connections for field voltage and field current are made at #6 screw terminals.
Field voltage and field current output signals are supplied at the 15-pin, female, D-type connector
designated J1. Connector J1 connects to DECS-400 connector P1 through a cable supplied with the Field
Isolation Module. Cable length is 15 feet (4.6 meters).
DECS-400 Terminal Functions and Assignments
In the following paragraphs, DECS-400 terminal functions are described and the terminal assignments for
each function are listed.
Operating Power
DECS-400 units with style number XLXX accept 24 or 48 Vdc nominal operating power. Units with style
number XCXX use two sets of operating power terminals and accept both 125 Vdc and 120 Vac nominal
operating power. One source is sufficient for operation, but two sources can be used to provide
redundancy.
The dc input has internal protection against reversed polarity. To prevent damage to the DECS-400 when
using two sources, ac operating power must be applied to the DECS-400 through an isolation
transformer. Basler Electric part number BE31449001 is recommended. Figure 92 illustrates the
connections for redundant operating power.
Figure 92. Redundant Operating Power Connections
Operating power terminals are listed in Table 8.
Table 8. Operating Power Terminals
Terminal Description
C2 (N) Return or neutral side of ac input (style XCXX only)
C3 (L) Line side of ac input (style XCXX only)
C4 (BATT–) Negative side of dc input (style XCXX or XLXX)
C5 (BATT+) Positive side of dc input (style XCXX or XLXX)
Chassis Ground
Terminal C1 (GND) serves as the chassis ground connection. Be sure that the DECS-400 is hard-wired to
earth ground with no smaller than 12 AWG copper wire attached to terminal C1.
Generator and Bus Voltage Sensing
DECS-400 units accommodate either single-phase or three-phase generator sensing voltage with two,
automatically selected ranges: 120 Vac or 240 Vac.
A single bus sensing voltage input connects from phase A to phase C. A sensing range of 120 Vac or 240
Vac is automatically selected by the bus sensing voltage input.
DECS-400 Installation