National Instruments cFP-PWM-520 Manual de usuario descargar pdf (Pagina 5)

Install a 2 A maximum, fast-acting fuse between the external

power supply and the V

SUP

terminal on each channel. Install

a 1 A maximum, fast-acting fuse suitable for the load at the

OUT

terminal. Figure 3 shows fuses where appropriate.

Figure 3. Wiring the [c]FP-PWM-520

Caution

Maximum output current for the cFP-PWM-520

is lower than 1 A if the module is operating in the

50–70 °C temperature range. Refer to the Specifications

section for more information, and select fuses for the V

OUT

terminals accordingly.

Pulse-Width Modulator Output Circuit

The [c]FP-PWM-520 output channels are optically isolated from

the rest of the FieldPoint bank. The channels are sourcing outputs

with short-circuit protection circuitry. Sourcing current means that

the V

OUT

terminal provides a path to a voltage supply. In the ON

state of the output period, a transistor is turned on between V

SUP

and V

OUT

. In the OFF state, this transistor is turned off, allowing

only a small leakage current to flow.

C V

SUP

OUT

[c]FP-PWM-520

COM

Protected

Sourcing

Output

–

Load

5 VDC or

10–30 VDC

External

Power Supply

COM

User-Supplied

Fuse

1 A Max

User-Supplied

Fuse

1 2 3 4 5 6 7 8 9 10 ... 18 19

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National Instruments cFP-PWM-520 Manual de usuario Pagina 5

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