Basler Electric DECS-250N - Manual (Page 25)

9440500990 Rev D 9
DECS-250N Power Inputs
Power Inputs
Power is applied to two separate inputs: control power and operating power. The control power input
supplies power to an internal power supply that provides power for logic, protection, and control functions.
The power stage uses the operating power input as the source for the converted excitation power that it
applies to the field.
Control Power
Two inputs supply the DECS-250N with control power. One input accepts dc control power and the other
input accepts ac control power. The level of acceptable control power voltage is determined by the style
number. One of two levels is possible. Style Lxxxxxx indicates a nominal voltage of 24 or 48 Vdc and
accepts a voltage range of 16 to 60 Vdc. Style Cxxxxxx indicates a nominal voltage of 120 Vac/125 Vdc
and accepts a voltage range of 90 to 150 Vdc and 82 to 132 Vac (50/60 Hz). One input (either dc or ac) is
sufficient for operation but two inputs provide redundancy (for style Cxxxxxx only). When both control
power inputs are used, an isolation transformer is required for the ac input. DC control power is applied at
terminals BATT+ and BATT–. AC control power is applied at terminals L and N.
Operating Power
Operating power is applied at terminals A, B, and C. To achieve the desired level of excitation, the
appropriate operating power input voltage must be applied. Table 2 lists the acceptable operating power
voltage ranges for the DECS-250N. The operating power frequency range for the DECS-250N is listed in
Table 3.
Table 2. DECS-250N Operating Power Specifications
Desired Nominal
Excitation Power Voltage
Applied Operating
Power Voltage Range
63 Vdc 100 to 139 Vac
125 Vdc 190 to 277 Vac
250 Vdc 380 to 528 Vac, 50/60 Hz (style xx3xxxx)
Table 3. DECS-250N Operating Power Frequency Specifications
DECS-250N
Style Number
Operating Power
Frequency Range
xx1xxxx 50/60 Hz
xx2xxxx 61 to 420 Hz
xx3xxxx 50/60 Hz (480 Vac input, 250 Vdc output)