4-8 Installation DECS-200
Table 4-2. Left-Hand Panel Terminal Specifications
Terminals Wire Size Capacity Maximum Screw Torque
A1 – A45
B7 – B10
14 AWG
0.4 N•m (3.5 in-lb)
B1 – B6
C1 – C6
10 AWG
0.5 N•m (4.4 in-lb)
In the following paragraphs, DECS-200 terminal functions are described and the terminal assignments for
each function are listed.
Control Power
DECS-200 units have two sets of power terminals. One set receives dc control power and the other set
receives ac control power.
A DECS-200 with a style number of XL accepts nominal dc control power of 24 or 48 Vdc. The ac control
power input of a style XL DECS-200 is not used.
A DECS-200 with a style number of XC accepts nominal dc control power of 125 Vdc and nominal ac
control power of 120 Vac. One source (either dc or ac) is sufficient for operation, but two sources can be
used to provide redundancy. The dc input has internal protection against reversed polarity connections.
When dual control power sources are used, an isolation transformer (part number BE31449001) is
required for the ac input. Control power terminal functions are listed in Table 4-3.
Table 4-3. Control Power Terminals
Terminal Description
B7 (BAT+) Positive side of dc input
B8 (BAT–) Negative side of dc input
B9 (L) Line side of ac input
B10 (N) Return or neutral side of ac input
Operating Power
Operating power for the pulse-width modulated (PWM) excitation output is usually derived from the
generator output. This input can also be developed by any suitable source that delivers voltage within the
limits specified in Section 1,
General Information, Specifications
.
Operating power may be either three-phase or single-phase. For single phase connections, any terminal
combination can be used.
The operating power applied must be of sufficient magnitude to support the required level of excitation
voltage. For 32 Vdc field voltage, the operating power voltage should be in the range of 56 to 70 Vac (60
Vac nominal). For 63 Vdc field voltage, the operating power voltage should be in the range of 100 to 139
Vac (120 Vac nominal). For 125 Vdc field voltage, the operating power voltage should be in the range of
190 to 277 Vac (240 Vac nominal). The operating power frequency can be within the range of 50 to 500
hertz.
Table 4-4. Operating Power Terminals
Terminal Description
C2 (A) A-phase operating power input
C3 (B) B-phase operating power input
C4 (C) C-phase operating power input
Chassis Ground
Terminal C1 (GND) serves as the DECS-200 chassis ground connection.
Generator and Bus Voltage Sensing
The DECS-200 accommodates either three-phase or single-phase generator sensing voltage with four
automatically selected ranges: 120, 240, 400, or 600 Vac for 60 hertz systems or 100, 200, 400, or 500
Vac for 50 hertz systems. When single-phase generator sensing voltage is used, use terminals A1 and A3
for the sensing connections.
To Next Page
Loading...
Need help?
General
