National Instruments Electronic Accessory CFP RLY 421 User Manual

FieldPoint Operating Instructions  
CFP-RLY-421  
Eight-Channel SPST Relay Module  
These operating instructions describe how to install and use the  
National Instruments cFP-RLY-421 relay module. For details on  
configuring and accessing the cFP-RLY-421 over a network, refer  
to the user manual for the FieldPoint network module you are  
using.  
Features  
The cFP-RLY-421 is a Compact FieldPoint relay output module  
with the following features:  
Eight single-pole single-throw (SPST) relay channels  
Switching capacity 1.5 A at 35 VDC or 250 VAC  
LED relay status indicators  
Hot swappable  
–40 to 60 °C operation  
250 Vrms maximum isolation voltage  
2,300 Vrms transient overvoltage protection  
Power Requirement  
The cFP-RLY-421 is powered by the FieldPoint network module  
through the backplane bus. The cFP-RLY-421 is a high-power  
consumption module, which may limit the number of I/O modules  
that you can connect to a single network module.  
FieldPoint™, National Instruments™, NI™, and ni.com™ are trademarks of National Instruments Corporation.  
Product and company names mentioned herein are trademarks or trade names of their respective companies.  
For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software,  
the patents.txt file on your CD, or ni.com/patents.  
323617A-01  
May 2003  
© 2003 National Instruments Corp. All rights reserved.  
 
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4
5
4
3
1
2
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cFP I/O Module  
Captive Screws  
cFP Controller Module  
4
5
Screw Holes  
cFP Backplane  
Figure 1. Installing the cFP-RLY-421  
Wiring the cFP-RLY-421  
The cFP-CB-x connector block has connections for each of the  
eight cFP-RLY-421 relay channels and for an external supply to  
power field devices. If you are using the cFP-RLY-421 in a  
hazardous voltage application, you must use the cFP-CB-1  
connector block or a suitable hazardous voltage cable. A hazardous  
voltage is a voltage greater than 42.4 Vpeak or 60 VDC.  
Caution Ensure that hazardous voltage wiring is  
performed only by qualified personnel adhering to local  
electrical standards.  
Each relay channel of the cFP-RLY-421 has two terminals:  
one NO (normally open) and one IC (isolated common).  
© National Instruments Corp.  
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cFP-RLY-421  
 
 
Table 1 lists the terminal assignments for the signals of each  
channel.  
Table 1. Terminal Assignments  
Terminal Numbers  
Channel  
NO  
1
IC  
2
0
1
2
3
4
5
6
7
3
4
5
6
7
8
9
10  
12  
14  
16  
11  
13  
15  
All of the COM terminals are connected internally and all of the  
SUP terminals are connected internally. NI does not recommend  
using them with the cFP-RLY-421.  
V
Table 2. VSUP and COM Terminal Assignments  
VSUP  
17  
COM  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
Caution Cascading power between two modules defeats  
isolation between those modules. Cascading power from  
the network module defeats all isolation between  
modules in the FieldPoint bank.  
cFP-RLY-421  
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Connecting Loads to the cFP-RLY-421  
Wire an external power supply to the load and IC terminal of the  
individual channel as shown in Figure 2. This method of wiring  
keeps the electrical connections of the cFP-RLY-421 within safe  
current limits.  
V
C
V
SUP  
NO  
Sourcing  
Load  
+
or  
IC  
AC  
COM  
To next channel  
cFP-RLY-421  
Figure 2. Connecting a Load  
The cFP-RLY-421 has eight SPST (Single-Pole-Single-Throw)  
electromechanical relays. The power-up state is off (open) to  
ensure safe installation. In the ON state, the NO and IC contacts  
connect to form a short circuit. In the ON state, there is an effective  
resistance of 100 mbetween the NO and IC terminals, which  
causes a voltage drop. For example, if the current is 1.5 A, the  
voltage drop across the NO and IC terminals is 0.15 V.  
the type of load, and ambient temperature. Refer to the  
Specifications section for more information.  
Protecting Contacts for Inductive Loads  
When inductive loads are connected to the relays, a large  
counter-electromotive force may occur at relay switching time  
because of the energy stored in the inductive load. These flyback  
voltages can severely damage the relay contacts and greatly  
shorten the life of the relay.  
It is best to limit flyback voltages by installing a flyback diode  
across an inductive DC load or a metal oxide varistor (MOV)  
across an inductive AC load. Refer to the Guidelines for Selecting  
Contact Protection Circuits section for more information.  
© National Instruments Corp.  
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cFP-RLY-421  
 
 
In addition, the cFP-RLY-421 has internal protection MOVs to  
prevent excessively high voltage from being applied across the  
contacts. The MOVs are located between the NO and IC contacts  
of each relay. However, National Instruments still recommends the  
use of a protection circuit across an inductive load. The flyback  
protection causes a small leakage current, which is detailed in the  
Specifications section.  
Guidelines for Selecting Contact  
Protection Circuits1  
Proper selection is critical, as the use of a contact-protection device  
can extend contact life. When mounting the protection device,  
always locate it near the immediate area of the load or contact.  
Typically, you should mount a protective device within 18 in. of the  
load or contact.  
Typically, contact-protection circuits are provided for an overview,  
but you should thoroughly examine the circuit you are planning  
to use.  
Diode and Zener Diode Circuit  
Diagram  
Notes  
Use in DC applications only.  
Use when diode circuit causes too long  
release time.  
Load  
Use zener diode with zener voltage about  
equal to power supply voltage.  
1
This section has been reprinted with permission from American Zettler, Inc.  
cFP-RLY-421  
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Diode Circuit  
Diagram  
Notes  
Use in DC applications only.  
Compared to RC type, circuit delays release  
time (2 to 5 times values stated in catalog).  
For larger voltages, use diode with reverse  
breakdown 10 times circuit voltage and  
forward load circuit.  
Load  
For smaller voltages, use reverse breakdown  
voltage of 2 to 3 times power supply voltage.  
CR Circuits  
Diagram  
Notes  
Circuit A is suitable for AC or DC  
applications, but if used with AC  
voltage, impedance of the load  
should be smaller than the CR  
Load  
circuit’s. Do not utilize for timer  
loads, as leakage current can cause  
faulty operations.  
Circuit B is suitable for AC or DC.  
If the load is a relay or solenoid,  
release times lengthen. Effective  
when connected to both contacts,  
power supply voltage across the  
load is 100 to 200 V.  
Load  
Varistor Circuit  
Diagram  
Notes  
Effective for AC and DC  
applications.  
Circuit slightly delays release time.  
Effective when connected to both  
Load  
contacts, power supply voltage  
across the load is 100 to 200 V.  
© National Instruments Corp.  
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cFP-RLY-421  
 
In-Rush Current  
The type of load and its in-rush current characteristics, together  
with switching frequency, can cause contact welding. For loads  
with in-rush current, measure the steady state current and in-rush  
current to determine the proper relay. Some typical types of loads  
and the in-rush current they create are summarized in the following  
chart.  
Type of Load  
Resistive load  
In-Rush Current  
Steady-state current  
Solenoid load  
10 to 20 times the steady-state current  
5 to 10 times the steady-state current  
10 to 15 times the steady-state current  
Motor load  
Incandescent lamp load  
Mercury lamp load  
Approximately 3 times the steady-state  
current  
Sodium vapor lamp load  
Capacitive load  
1 to 3 times the steady-state current  
20 to 40 times the steady-state current  
5 to 15 times the steady-state current  
Transformer load  
Status Indicators  
Figure 3 shows the status indicator LEDs on the cFP-RLY-421.  
R
Y
WE  
0
1
2
3
4
5
6
7
P
READ  
Figure 3. Status Indicators  
After you insert the cFP-RLY-421 into a backplane and apply  
power to the network module, the green POWER indicator lights  
and the cFP-RLY-421 informs the network module of its presence.  
When the network module recognizes the cFP-RLY-421, it sends  
initial configuration information to the cFP-RLY-421. After the  
cFP-RLY-421 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 output state indicator that lights  
when the channel is in the ON state.  
cFP-RLY-421  
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Upgrading the FieldPoint Firmware  
You may need to upgrade the FieldPoint firmware when you add  
new I/O modules to the FieldPoint system. For information on  
determining which firmware you need and how to upgrade the  
firmware, go to ni.com/info and enter fpmatrix.  
Isolation and Safety Guidelines  
Caution Read the following information before  
attempting to connect the cFP-RLY-421 to any circuits  
that may contain hazardous voltages.  
This section describes the isolation of the cFP-RLY-421 and its  
compliance with international safety standards. The field wiring  
connections are isolated from the backplane. 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-RLY-421 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  
cFP-RLY-421.  
Even though the cFP-RLY-421 is designed to handle applications  
with hazardous potentials, follow these guidelines to ensure a safe  
total system:  
The cFP-RLY-421 has 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.  
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.  
© National Instruments Corp.  
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cFP-RLY-421  
 
Do not 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-x backplane 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 backplanes in an area,  
position, or cabinet that prevents accidental or unauthorized  
access to wiring that carries hazardous voltages.  
The isolation of the cFP-RLY-421 is certified as  
double-insulated for working voltages of 250 Vrms. Do not use  
the cFP-RLY-421 as the only isolating barrier between human  
contact and working voltages of more than 250 Vrms  
.
Operate the cFP-RLY-421 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.  
Do not 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-RLY-421 at or below Installation Category II.  
Installation 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.  
cFP-RLY-421  
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ni.com  
 
Specifications  
The following specifications are typical for a range of –40 to 60 °C  
unless otherwise noted.  
Relay Characteristics  
Number of channels..........................8  
Relay type.........................................1 SPST, nonlatching  
Maximum switching capacity (resistive load)  
–40 to 60 °C  
AC........................................1.5 A at 250 VAC  
DC........................................1.5 A at 0 to 35 VDC  
1 A at 55 VDC  
0.4 A at 120 VDC  
Minimum switching load..................10 mA at 5 VDC  
On resistance.....................................100 mΩ  
Off-state leakage (120 VDC/250 VAC)  
Frequency  
DC  
Off-State Leakage  
0.12 µA  
50/60 Hz  
8 µA  
Expected life  
Mechanical .................................20 × 106 operations min  
Electrical (at 30 cpm) .................300,000 operations at 1.5 A,  
35 VDC;  
100,000 operations at 1.5 A,  
250 VAC  
Maximum switching frequency  
Mechanical .................................20 operations per second  
Electrical.....................................1 operation per second at  
maximum load  
Relays operate time...........................6 ms typical, 8 ms max  
Relays release time ...........................3 ms typical, 4 ms max  
Relay bounce time ............................3 ms max  
Contact material................................Gold-plated silver cadmium  
oxide  
© National Instruments Corp.  
11  
cFP-RLY-421  
 
 
Physical  
Indicators ..........................................Green POWER and  
READY indicators, 8 green  
output state indicators  
Weight  
cFP-RLY-421..............................130 g (4.5 oz)  
Power Requirements  
Power from network module ............1,700 mW  
Isolation Voltage  
Maximum isolation voltage ..............250 Vrms  
Channel-to-channel isolation............No isolation between  
channels  
Transient overvoltage........................2,300 Vrms  
Environmental  
FieldPoint modules are intended for indoor use only. For outdoor  
use, they must be mounted inside a sealed enclosure.  
Operating temperature ......................40 to 60 °C  
Storage temperature..........................55 to 85 °C  
Humidity...........................................10 to 90% RH,  
noncondensing  
Maximum altitude.............................2,000 m; at higher altitudes  
the isolation voltage ratings  
must be lowered  
Pollution Degree ...............................2  
Shock and Vibration  
Operating vibration, random  
(IEC 60068-2-64)..............................10–500 Hz, 5 grms  
Operating vibration, sinusoidal  
(IEC 60068-2-6)................................10–500 Hz, 5 g  
Operating shock  
(IEC 60068-2-27)..............................50 g, 3 ms half sine,  
18 shocks at 6 orientations;  
30 g, 11 ms half sine,  
18 shocks at 6 orientations  
cFP-RLY-421  
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Safety  
This product is designed to meet the requirements of the following  
standards of safety for electrical equipment for measurement,  
control, and laboratory use:  
IEC 61010-1, EN 61010-1  
UL 3121-1, UL 61010C-1  
CAN/CSA C22.2 No. 1010.1  
For UL, hazardous location, and other safety certifications, refer to  
the product label or to ni.com.  
Electromagnetic Compatibility  
CE, C-Tick, and FCC Part 15 (Class A) Compliant  
Emissions..........................................EN 55011 Class A at 10 m  
FCC Part 15A above 1 GHz  
Immunity...........................................EN 61326:1997 + A2:2001,  
Table 1  
Note For EMC compliance, you must operate this device  
with shielded cabling.  
CE Compliance  
This product meets the essential requirements of applicable  
European Directives, as amended for CE Marking, as follows:  
Low-Voltage Directive (safety).........73/23/EEC  
Electromagnetic Compatibility  
Directive (EMC) ...............................89/336/EEC  
Note Refer to the Declaration of Conformity (DoC) for  
this product for any additional regulatory compliance  
information. To obtain the DoC for this product, click  
Declarations of Conformity Information at  
ni.com/hardref.nsf/.  
© National Instruments Corp.  
13  
cFP-RLY-421  
 
Where to Go for Support  
For more information about setting up the FieldPoint system, refer  
to these National Instruments documents:  
FieldPoint network module user manual  
Other FieldPoint I/O module operating instructions  
FieldPoint connector block operating instructions  
Go to ni.com/support for the most current manuals, examples,  
and troubleshooting information.  
For telephone support in the United States, create your service  
request at ni.com/ask and follow the calling instructions or dial  
512 795 8248. For telephone support outside the United States,  
contact your local branch office:  
Australia 02 612 9672 8846, Austria 43 0 662 45 79 90 0,  
Belgium 32 0 2 757 00 20, Brazil 55 11 3262 3599,  
Canada (Calgary) 403 274 9391,  
Canada (Montreal) 514 288 5722,  
Canada (Ottawa) 613 233 5949, Canada (Québec) 514 694 8521,  
Canada (Toronto) 905 785 0085,  
Canada (Vancouver) 514 685 7530, China 86 21 6555 7838,  
Czech Republic 420 2 2423 5774, Denmark 45 45 76 26 00,  
Finland 385 0 9 725 725 11, France 33 0 1 48 14 24 24,  
Germany 49 0 89 741 31 30, Greece 30 2 10 42 96 427,  
India 91 80 51190000, Israel 972 0 3 6393737,  
Italy 39 02 413091, Japan 81 3 5472 2970,  
Korea 82 02 3451 3400, Malaysia 603 9131 0918,  
Mexico 001 800 010 0793, Netherlands 31 0 348 433 466,  
New Zealand 64 09 914 0488, Norway 47 0 32 27 73 00,  
Poland 48 0 22 3390 150, Portugal 351 210 311 210,  
Russia 7 095 238 7139, Singapore 65 6226 5886,  
Slovenia 386 3 425 4200, South Africa 27 0 11 805 8197,  
Spain 34 91 640 0085, Sweden 46 0 8 587 895 00,  
Switzerland 41 56 200 51 51, Taiwan 886 2 2528 7227,  
Thailand 662 992 7519, United Kingdom 44 0 1635 523545  
cFP-RLY-421  
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