National Instruments FIELDPOINT CFP-CB-1 Bedienungsanleitung

cFP-CB-1

323322B-01 April 2003

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FieldPoint Operating Instructions

cFP-CB-1 and cFP-CB-3

Compact FieldPoint Connector Blocks

These operating instructions describe how to install and use the

cFP-CB-1 and cFP-CB-3 (referred to inclusively as the cFP-CB-x).

Features

The cFP-CB-1 and cFP-CB-3 are Compact FieldPoint connector

blocks with the following features:

• cFP-CB-1 is designed for general-purpose and hazardous

voltage1operation with all Compact FieldPoint I/O modules

• Isothermal construction of cFP-CB-3 minimizes temperature

gradients for use with thermocouples

• Mount on a cFP-BP-xCompact FieldPoint backplane

• 36 terminals available (cFP-CB-3 has 18)

• Tie-wrap anchors for wires

• Color-coded V and C terminals for voltage supply and

common connections

• –40 to 70 °C operation

1 Hazardous voltage is voltage greater than 30 Vrms/42.4 V peak or 60 VDC.

cFP-CB-1 and cFP-CB-3 2 ni.com

Figure 1. cFP-CB-1 Parts Locator Diagram

Note Earlier cFP-CB-1 connector blocks have a different

screw-terminal numbering arrangement.

Figure 2. cFP-CB-3 Parts Locator Diagram

1 Tie-Wrap Anchors

2 Screw Hole for Strain-Relief Bar

3 Screw Terminals

4 Screw Hole for Top Cover

5 Mounting Screw

6 37-Pin I/O Connector

1 Tie-Wrap Anchors

2 Screw Hole for Strain-Relief Bar

3 Overlay Showing Channel

Assignments of Screw Terminals

4 Screw Hole for Top Cover

5 Mounting Screw

6 Screw Terminals

7 37-Pin I/O Connector

cFP-TC-120

+ –

CH 0

+ –

CH 1

+ –

CH 2

CH 3

–

CH 4

+ –

CH 5

+ –

CH 6

+ –

CH 7

TERMINAL

ASSIGNMENTS

–+

Wiring to the Connector Block

Refer to the I/O module operating instructions for information

about wiring configurations, including detailed wiring diagrams

and fuse recommendations.

Note To protect the FieldPoint system and connected

devices, install appropriate external fuses on all screw

terminals. Refer to the Specifications section for the

current limits of the cFP-CB-xscrew terminals.

Note The V terminals are internally connected to each

other and the C terminals are internally connected to each

other.

Caution Ensure that hazardous voltage wiring is

performed only by qualified personnel adhering to local

electrical standards.

1. Loosen the top cover screws and remove the cover. Refer to

Figure 3.

Figure 3. Removing the Top Cover from the cFP-CB-x

2. Verify that there are no cuts in the wire insulation that can

cause a safety hazard.

3. Strip 6 mm (0.24 in.) of insulation from the ends of the wires.

cFP-CB-1 and cFP-CB-3 4 ni.com

4. Insert the entire stripped ends of the wires into the appropriate

screw terminals. Do not allow any bare wire to show outside

the screw terminals.

5. Using a 1/8 in. flathead screwdriver, tighten the screw

terminals to 0.5–0.6 N ⋅m (4.4–5.3 lb ⋅in.) of torque.

Installing the Strain-Relief Bar

The cFP-CB-1 is shipped with two strain-relief bars, one with a

foam cushion for wires and one with grooves for jacketed cables.

The cFP-CB-3 has one foam-cushion strain relief bar. The tie-wrap

anchors on the connector block provide additional strain relief.

Figure 4 shows the two strain-relief bars.

Figure 4. cFP-CB-xStrain-Relief Bars

Choose the strain-relief bar that suits your application and

complete the following steps:

1. Using a number 2 Phillips screwdriver, install the strain-relief

bar on the connector block as shown in Figure 5.

Figure 5. Installing the Strain-Relief Bar

2. Tighten the strain-relief screws. If you are using the cushioned

strain-relief bar, make sure all the wires are secure against the

cushion and not touching metal parts of the connector block.

3. Reinstall the top cover and tighten the top cover screws.

4. Install tie wraps as shown in Figure 6.

Figure 6. Tie Wraps

Installing the cFP-CB-x

To install the cFP-CB-x, refer to Figure 7 and complete the

following steps:

1. Align the captive screws on the cFP-CB-xwith the holes on the

backplane. The shape of the I/O connector on the cFP-CB-x

prevents backward insertion.

2. Press firmly to seat the cFP-CB-xon 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.

Front View Rear View

cFP-CB-1 and cFP-CB-3 6 ni.com

Figure 7. Installing the cFP-CB-x

Thermocouple Wiring

Compact FieldPoint thermocouple input modules can measure the

temperature of the terminals on the cFP-CB-1 or cFP-CB-3

connector block. The modules use this measurement, called the

cold junction temperature, to compensate for the thermoelectric

voltages generated at these junctions. For the most accurate

cold-junction compensation, use the cFP-CB-3 for connecting

thermocouple signals.

Heat dissipated by adjacent modules (or other nearby heat sources)

can cause errors in thermocouple measurements by heating the

terminals to a different temperature than the sensor used to

measure the cold junction. The thermal gradient generated across

the terminals can cause the terminals of different channels to differ

in temperatures. The resulting measurement creates errors in

1 Connector Block Captive Screws

2 I/O Module

3 Screw Holes for Connector Block

4 Socket for Connector Block

absolute and relative accuracy between channels. The actual

thermal gradient depends on the connector block you use and

the details of your installation. The following section provides

guidelines for minimizing thermal gradients.

Minimizing Thermal Gradients

To minimize the thermal gradient across the terminals, use the

cFP-CB-3 for connecting thermocouple signals. The cFP-CB-3 is

designed with isothermal construction to keep the terminals at the

same temperature. In addition to using the cFP-CB-3, you can

minimize thermal gradients by following these guidelines:

• Do not place power supplies or other heat sources directly

above or below the Compact FieldPoint system.

• Do not install high-power modules, such as the cFP-DO-4xx

and cFP-RLY-4xx, adjacent to the cFP-CB-3.

• Use small-gauge thermocouple wire to transfer less heat.

• Run thermocouple wires together near the connector block to

keep them at the same temperature.

• Avoid running thermocouple wires near hot or cold objects.

• Use the foam cushion strain relief to restrict air flow.

Isolation and Safety Guidelines

Caution Read the following information before

attempting to connect the cFP-CB-xto any circuits that

may contain hazardous voltages.

This section describes the isolation of the cFP-CB-xand its

compliance with international safety standards. The field wiring

connections are isolated from the backplane and the inter-module

communication bus. The isolation is provided by the module,

which has optical and galvanic isolation barriers designed and

tested to protect against transient fault voltages of up to 2,300 Vrms.

The cFP-CB-xprovides 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.

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.

cFP-CB-1 and cFP-CB-3 8 ni.com

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

cFP-CB-x.

Even though the cFP-CB-xis designed to handle applications with

hazardous potentials, follow these guidelines to ensure a safe total

system:

• The cFP-CB-xhas a safety isolation barrier between the

I/O channels and the inter-module communication bus. There

is no isolation between channels unless otherwise noted. If any

of the channels on a module are wired at a hazardous potential,

make sure that all other devices or circuits connected to that

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.

• 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 the backplane in an area,

position, or cabinet that prevents accidental or unauthorized

access to wiring that carries hazardous voltages.

• The isolation of the cFP-CB-xis certified as double-insulated

for working voltages of 250 Vrms. Do not use the cFP-CB-xas

the only isolating barrier between human contact and working

voltages of more than 250 Vrms.

• Operate the cFP-CB-xonly 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.

•Donot operate FieldPoint products in an explosive atmosphere

or where there may be flammable gases or fumes. If you need

to operate FieldPoint products in such an environment, the

FieldPoint products must be in a suitably rated enclosure.

• Operate the cFP-CB-xat or below Installation Category II.

Installation Category II is for measurements performed on

circuits directly connected to the electrical distribution system.

This category refers to local-level distribution, such as that

provided by a standard wall outlet.

Specifications

The following specifications are typical for the range –40 to 70 °C,

unless otherwise noted.

Installation

Terminal wiring ................................ 16–26 AWG copper

conductor wire with 6 mm

(0.24 in.) of insulation

stripped from the end1

Maximum cable diameter ................. 8 mm (5/16 in.) with

cable-grooved strain relief

Torque for screw terminals ............... 0.5–0.6 N ⋅m

(4.4–5.3 lb ⋅in.)

Maximum current for screw terminals2

V and C terminals....................... 4 A

All other terminals...................... 2 A

Accuracy

Cold-junction accuracy ..................... 0.15 °C typ, 0.3 °C max

There is typically an additional 0.2 °C difference between the

temperature of the cold-junction sensor and that of the actual

terminals.

1 Use only copper conductor wire unless you are working with a sensing device, such

as a thermocouple, that requires a different type of wire.

2 Use fast-acting fuses to limit the current through screw terminals. Some I/O module

terminals require a lower maximum current value. Refer to the I/O module operating

instructions for more information.

Andere Handbücher für FIELDPOINT CFP-CB-1

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