National Instruments FIELDPOINT cFP-PWM-520 Bedienungsanleitung

FIELDPOINT™OPERATING INSTRUCTIONS

AND SPECIFICATIONS

FP-PWM-520 and

cFP-PWM-520

Eight-Channel, 5 V or 10–30 V PWM Output Module

These operating instructions describe how to install and use

the National Instruments FP-PWM-520 and cFP-PWM-520

pulse-width modulation modules (referred to inclusively as the

[c]FP-PWM-520). For details on configuring and accessing the

[c]FP-PWM-520 over a network, refer to the user manual for the

FieldPoint network module you are using.

Features

The [c]FP-PWM-520 is a FieldPoint pulse-width modulation

(PWM) output module with the following features:

• Eight PWM sourcing output channels

• 0 to 100% duty-cycle capability with 12-bit resolution

• Short-circuit protection for outputs

• Outputs source 5 VDC or 10–30 VDC with user-provided

power supply

• Independent configuration of the output period for each

channel from 1 to 65,535 ms in 1 ms increments

• On/Off LED indicators

• 250 Vrms CAT II continuous channel-to-ground isolation,

verified by 2,300 Vrms, 5 s dielectric withstand test

• –40 to 70 °C operation

• Hot swappable

FP-PWM-520 and cFP-PWM-520 2 ni.com

Installing the FP-PWM-520

The FP-PWM-520 mounts on a FieldPoint terminal base

(FP-TB-x), which provides operating power to the module.

Installing the FP-PWM-520 onto a powered terminal base does

not disrupt the operation of the bank.

To install the FP-PWM-520, refer to Figure 1 and complete the

following steps:

1. Slide the terminal base key to either position X, used for any

module, or position 4, used for the FP-PWM-520 module.

2. Align the FP-PWM-520 alignment slots with the guide rails on

the terminal base.

3. Press firmly to seat the FP-PWM-520 on the terminal base.

When the module is firmly seated, the terminal base latch locks

it into place.

Figure 1. Installing the FP-PWM-520

1 I/O Module

2 Terminal Base

3 Alignment Slot

4 Terminal Base Key

5 Latch

6 Guide Rails

Installing the cFP-PWM-520

The cFP-PWM-520 mounts on a Compact FieldPoint backplane

(cFP-BP-xor cFP-180x), which provides operating power to the

module. Installing the cFP-PWM-520 onto a powered backplane

does not disrupt the operation of the bank.

To install the cFP-PWM-520, refer to Figure 2 and complete the

following steps:

1. Align the captive screws on the cFP-PWM-520 with the screw

holes on the backplane. The alignment keys on the

cFP-PWM-520 prevent backward insertion.

2. Press firmly to seat the cFP-PWM-520 on the backplane.

3. Using a number 2 Phillips screwdriver with a shank of at least

64 mm (2.5 in.) length, tighten the captive screws to 1.1 N ⋅m

(10 lb ⋅in.) of torque. The nylon coating on the screws prevents

them from loosening.

Figure 2. Installing the cFP-PWM-520

1 cFP I/O Module

2 Captive Screws

3 cFP Controller Module

4 Screw Holes

5 cFP Backplane

FP-PWM-520 and cFP-PWM-520 4 ni.com

Wiring the [c]FP-PWM-520

The FP-TB-xterminal base has connections for each of the eight

output channels and for an external power supply to power the

output channels and field devices. The cFP-CB-xconnector block

provides the same connections. Each channel has one output

terminal (VOUT), one supply terminal (VSUP), and two common

terminals (COM). All eight channels are referenced to the COM

terminals. The V and VSUP terminals are all internally connected,

as are the C and COM terminals.

Table 1 lists the terminal assignments for the signals of each

channel. Terminal assignments are also listed on the side panel

of the cFP-PWM-520 and under the slide-in card on the front of the

FP-PWM-520. Connect to the terminals using the terminal base,

connector block, or other connectivity accessory.

Use a 5 VDC or 10–30 VDC external power supply for the output

channels. The power supply must provide enough current to power

all of the loads on the output channels, up to a maximum of 1 A per

channel. Connect the external power supply to multiple V and VSUP

terminals and to multiple C and COM terminals as needed to

ensure that the maximum current through any terminal is 2 A

or less.

Table 1. Terminal Assignments

Channel

Terminal Numbers

VOUT*VSUP†COM

0 1 17 2, 18

1 3 19 4, 20

2 5 21 6, 22

3 7 23 8, 24

4 9 25 10, 26

511 27 12, 28

613 29 14, 30

715 31 16, 32

*Install a 1 A maximum, fast-acting fuse on each VOUT terminal.

†Install a 2 A maximum, fast-acting fuse on each VSUP terminal.

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

power supply and the VSUP terminal on each channel. Install

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

VOUT 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 VOUT

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

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

and VOUT. 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

FP-PWM-520 and cFP-PWM-520 6 ni.com

In the ON state, the effective resistance between VOUT and VSUP

causes a voltage drop between the external supply voltage and the

output voltage. For example, if the external supply voltage is 5 V

and the output current is 1 A, calculate the output voltage as

follows:

5 V – (1 A ×RON) = VOUT

where RON is the ON resistance and VOUT is the output voltage.

Refer to the Specifications section for the value of the ON

resistance.

Short-Circuit Protection

If the protection circuitry detects a short-circuit condition on an

output channel, it disables the output. If the protection circuitry

disables an output that would otherwise be in the ON state, the

status indicator for that channel is still lit, but the output transistor

is turned off.

Detecting a Short-Circuit Condition

To determine whether a channel is in a short-circuit condition,

complete the following steps:

1. In FieldPoint software, set the duty cycle to 100% for the

channel in question. Refer to the Configuring the Output

Channels section for more information about configuring the

duty cycle.

2. Measure the voltage between the VOUT and VSUP terminals for

that channel.

Under normal load conditions, the VOUT-to-VSUP voltage is

less than 1 V when the output is ON continuously. Any voltage

higher than 1 V indicates a short circuit. Typically, the

VOUT-to-COM voltage is almost zero if the protection circuitry

is activated.

Resetting a Channel in a Short-Circuit Condition

To reset a channel in a short-circuit condition, determine the cause

of the condition and disconnect the load from the channel. The

channel resets automatically when the load is removed.

Alternatively, if completely removing the channel load is not

convenient, reset the channel in any of the following ways:

• In FieldPoint software, set the duty cycle to 0%. The channel

resets immediately.

• Disconnect the external power supply from the

[c]FP-PWM-520.

• Remove the [c]FP-PWM-520 from the terminal base or

backplane.

• Power off the network module connected to the

[c]FP-PWM-520.

Normal operation can resume after you correct the short-circuit

condition.

Overcurrent Protection

Each output channel on the [c]FP-PWM-520 has circuitry that

protects it from current surges resulting from short circuits.

Whether the module suffers damage from overcurrent conditions

depends on the following factors:

• The amount of current through the channel

• The amount of time the current is above the current limit

• The frequency of current surges

If the level of current through the output terminal is higher than the

guaranteed trip current for the module, the channel trips and goes

into an overcurrent state. In an overcurrent state, the channel turns

off and the module is not damaged. If the level of current through

the output terminal is higher than the minimum possible trip

current and lower than the guaranteed trip current, the state of the

channel is indeterminate and depends on factors such as the current

level, the temperature, and the power supply.

Inrush currents that exist for less than the trip time do not trip the

protection circuitry. Refer to the Specifications section for more

information about the maximum continuous output current, trip

current, and trip time.

Power Supplies and Overcurrent Conditions

If a short circuit occurs, the current through an output terminal can

exceed the current rating for the power supply and the maximum

continuous current for the [c]FP-PWM-520.

If the power supply you are using with the [c]FP-PWM-520 cannot

supply more than the guaranteed trip current, the module may be

damaged if a short circuit occurs.

FP-PWM-520 and cFP-PWM-520 8 ni.com

Configuring the Output Channels

A [c]FP-PWM-520 output channel uses period and duty-cycle

settings to determine when the channel is on or off. To configure

the period, complete the following steps in Measurement &

Automation Explorer (MAX):

1. On the Channel Configuration tab for the [c]FP-PWM-520,

select Period from the Attribute menu.

2. Enter an integer between 1 ms (1 kHz) and 65,535 ms

(0.01525 Hz) in the Value field.

To configure the duty cycle, write to the channel for which you

want to set the duty cycle. The duty cycle is the proportion of time

that the PWM signal is ON over the period.

Enter a value from 0 to 100 to set the duty cycle. The duty cycle has

12-bit resolution (4,096 discrete duty-cycle settings).

Figure 4. Period and Duty Cycle of a PWM Output

Status Indicators

The [c]FP-PWM-520 has two green status LEDs, POWER and

READY. After you insert the FP-PWM-520 onto a terminal base

or the cFP-PWM-520 onto a backplane and apply power to the

connected network module, the green POWER indicator lights

and the [c]FP-PWM-520 informs the network module of its

presence. When the network module recognizes the

1 PWM Output 2OnTime 3Period

Duty Cycle OnTime

Period

---------------------100×=

VSUP

2 2

[c]FP-PWM-520, it sends initial configuration information to the

[c]FP-PWM-520. After the [c]FP-PWM-520 receives this initial

information, the green READY indicator lights and the module is

in normal operating mode.

In addition to the green POWER and READY indicators, each

channel has a numbered, green status LED that lights when the

channel is in the ON state.

Upgrading Your FieldPoint Firmware

You may need to upgrade your FieldPoint firmware when you add

new I/O modules to your FieldPoint system. For information on

determining which firmware you need and how to upgrade your

firmware, go to ni.com/info and enter fpmatrix.

Isolation and Safety Guidelines

Caution Read the following information before

attempting to connect the [c]FP-PWM-520 to any circuits

that may contain hazardous voltages.

This section describes the isolation of the [c]FP-PWM-520 and its

compliance with international safety standards. The field wiring

connections are isolated from the backplane and the inter-module

communication bus. The isolation barriers in the module provide

250 Vrms Measurement Category II continuous isolation, verified

by 2,300 Vrms, 5 s dielectric withstand test. The [c]FP-PWM-520

provides double insulation (compliant with IEC 61010-1) for

working voltages of 250 Vrms1. Safety standards (such as those

published by UL and IEC) require the use of double insulation

between hazardous voltages and any human-accessible parts or

circuits.

Never try to use any isolation product between human-accessible

parts (such as DIN rails or monitoring stations) and circuits that

can be at hazardous potentials under normal conditions, unless the

product is specifically designed for such an application, as is the

[c]FP-PWM-520.

1 Working voltage is defined as the signal voltage plus the common-mode voltage.

Common-mode voltage is the voltage of the module with respect to ground.

FP-PWM-520 and cFP-PWM-520 10 ni.com

Even though the [c]FP-PWM-520 is designed to handle

applications with hazardous potentials, follow these guidelines to

ensure a safe total system:

• There is no isolation between channels on the

[c]FP-PWM-520. If a hazardous voltage is present on any

channel, all channels are considered hazardous. Make sure that

all other devices and circuits connected to the module are

properly insulated from human contact.

•Donot share the external supply voltages (the V and C

terminals) with other devices (including other FieldPoint

devices), unless those devices are isolated from human contact.

• For Compact FieldPoint, you must connect the protective earth

(PE) ground terminal on the cFP-BP-xbackplane to the system

safety ground. The backplane PE ground terminal has the

following symbol stamped beside it: . Connect the

backplane PE ground terminal to the system safety ground

using 14 AWG (1.6 mm) wire with a ring lug. Use the 5/16 in.

panhead screw shipped with the backplane to secure the ring

lug to the backplane PE ground terminal.

• As with any hazardous voltage wiring, make sure that all

wiring and connections meet applicable electrical codes and

commonsense practices. Mount terminal bases and backplanes

in an area, position, or cabinet that prevents accidental or

unauthorized access to wiring that carries hazardous voltages.

•Donot use the [c]FP-PWM-520 as the only isolating barrier

between human contact and working voltages higher than

250 Vrms .

• Operate the [c]FP-PWM-520 only at or below Pollution

Degree 2. Pollution Degree 2 means that only nonconductive

pollution occurs in most cases. Occasionally, however, a

temporary conductivity caused by condensation must be

expected.

• Operate the [c]FP-PWM-520 at or below Measurement

Category II. Measurement Category II is for measurements

performed on circuits directly connected to the low-voltage

installation. This category refers to local-level distribution,

such as that provided by a standard wall outlet.

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