National Instruments Network Card FP RLY 420 User Manual

OPERATING INSTRUCTIONS  
FP-RLY-420  
8-Channel, SPST Relay Module  
These operating instructions describe the installation, features, and  
characteristics of the FP-RLY-420. For details on configuring and  
accessing the FP-RLY-420 over a network, refer to the user manual  
for the particular FieldPoint network module you are using with  
the FP-RLY-420.  
Features  
The FP-RLY-420 is a FieldPoint relay output module with the  
following features:  
Eight Single-Pole Single-Throw (SPST) relay channels  
Switching capacity 3 A at 35 VDC or 250 VAC  
On/Off LED indicators  
Hot plug and play operation  
3,000 V input to output isolation  
Double insulated for 250 V safe working voltage  
–40 to +70 °C operation  
Power Requirement  
The FP-RLY-420 is powered via the local backplane bus from the  
FieldPoint network module. The FP-RLY-420 is a high-power  
consumption module and requires more than the nominal power  
allocated to an I/O module from the network module. In some  
applications, this could limit the number of I/O modules that you  
can connect to a single network module.  
When defining a FieldPoint system that uses an FP-RLY-420  
module, you must calculate the power consumption. First refer  
to the specifications section in the user manual for your network  
FieldPoint is a trademark of National Instruments Corporation. Product and company names  
mentioned herein are trademarks or trade names of their respective companies.  
321904B-01  
© Copyright 1998, 1999 National Instruments Corp. All rights reserved. June 1999  
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Field Wiring  
The terminal base has connections for each of the eight relay  
channels and an external supply to power field devices. Each relay  
channel of the FP-RLY-420 has two terminals: N.O. (Normally  
Open) and I.C. (Isolated Common). The external supply is not  
needed for the internal operation of the FP-RLY-420; however,  
you may connect an external supply to power field devices by  
connecting to the V and C terminals of the terminal base. If you  
connect an external supply to the V and C terminals, the total  
current supplied cannot exceed 6 A.  
Table 1 lists the terminal assignments for the signals of each  
channel.  
Table 1. Terminal Assignments  
Terminal Numbers  
Chan-  
Vsup  
17  
19  
21  
23  
25  
27  
29  
31  
nel  
N.O.  
I.C.  
COM  
18  
0
1
2
1
3
4
20  
2
5
6
22  
3
7
8
24  
4
9
10  
12  
14  
16  
26  
5
11  
13  
15  
28  
6
30  
7
32  
© National Instruments Corp.  
3
FP-RLY-420  
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Figures 2a and 2b show examples of basic wiring connections.  
+
V
C
V
sup  
Load  
N.O.  
I.C.  
COM  
N.O.  
I.C.  
Load  
Load  
+
V
sup  
N.O.  
I.C.  
N.O.  
I.C.  
+
Load  
COM  
a. Total Current Less  
Than 6 Amps  
b. Total Current Greater  
Than 6 Amps  
Figure 2. Basic Field Connection (Two Channels Shown)  
Relay Output Circuit  
The outputs of the FP-RLY-420 consist of Form A  
electromechanical relays. The power-up state is off (open) to  
ensure safe installation. In the ON state, the N.O. and I.C. contacts  
connect together to form a short circuit. Choose the impedance of  
the loads so that the current switched by any one channel in the ON  
state is no more than 3 A.  
In the ON state, there is an effective resistance of 100 mbetween  
the N.O. and I.C. terminals, which causes a voltage drop. For  
example, if the current is 3 A, the voltage drop across the N.O.  
and I.C. terminals is 0.3 V.  
FP-RLY-420  
4
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Figure 3 shows the diagram of one channel’s relay output circuit.  
V
V
sup  
N.O.  
I.C.  
COM  
C
Figure 3. Relay Output Circuit  
The maximum switching capacity of each relay is 3 A up to  
250 VAC or 35 VDC. To switch greater DC voltages, refer to  
Figure 4.  
3
2.5  
2
Safe Operating  
Current  
Region  
1.5  
(Amps)  
1
.5  
0
20 40 60 80 100 120  
DC Volts  
Figure 4. Maximum Current vs. DC Volts  
Contact Protection 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 these flyback voltages at your inductive load by  
installing, across your inductive load, a flyback diode for DC loads  
or a metal oxide varistor (MOV) for AC loads. Refer to the next  
section, Guidelines for Selecting Contact Protection Circuits, for  
more information.  
© National Instruments Corp.  
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FP-RLY-420  
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In addition, the FP-RLY-420 contains its own internal protection  
MOV to prevent excessively high voltage from being applied  
across the contacts. The MOV is located between the N.O. and I.C.  
contacts of each relay, but National Instruments still recommends  
the use of a protection circuit across your inductive load.  
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. For more specific information on any of these circuits, contact  
the Technical Services Department at American Zettler, Inc.  
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.  
FP-RLY-420  
6
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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,  
Load  
power supply voltage across the  
load is 100 to 200 V.  
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.  
7
FP-RLY-420  
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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 5 shows the module label and status indicators. You can  
remove the insertable label to see wiring diagrams for the input  
channels.  
Figure 5. Status Indicators and Module Label  
FP-RLY-420  
8
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After the module has been inserted into a terminal base (and  
power is applied), the green POWER indicator lights and the  
FP-RLY-420 informs the network module of its presence. When  
the network module recognizes the FP-RLY-420, the network  
module sends initial configuration information to the FP-RLY-420.  
After receiving this initial information, the green READY  
indicator lights and the FP-RLY-420 is in its 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.  
Isolation and Safety Guidelines  
Caution Read the following information before  
attempting to connect ANY circuits that may contain  
hazardous voltages to the FP-RLY-420.  
This section describes the isolation of the FP-RLY-420 and its  
compliance with international safety standards. The outputs are  
isolated from the backplane of the terminal base with an isolation  
barrier designed and tested to protect against fault voltages of up to  
3000 Vrms. In addition, the FP-RLY-420 provides double  
insulation (compliant to UL and IEC safety standards) for working  
common-mode voltages of 250 Vrms. 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. You should never attempt to use any isolation  
product between human-accessible parts (such as DIN rails or  
monitoring stations) and circuits that may be at hazardous  
potentials under normal conditions, unless the product is  
specifically designed (as the FP-RLY-420 is) for such an  
application.  
Even when a product like the FP-RLY-420 is used in applications  
with hazardous potentials, follow these guidelines to ensure a safe  
total system:  
The safety isolation of the FP-RLY-420 is from input to output,  
not between channels on the same module. If any of the  
channels on a module are wired at a hazardous potential,  
ensure that all other devices or circuits connected to that  
module are properly insulated from human contact.  
© National Instruments Corp.  
9
FP-RLY-420  
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Do not share the external supply voltages (V and C on the  
terminal base) with other devices (including other FieldPoint  
devices) unless those devices are also isolated from human  
contact.  
As with any hazardous voltage wiring, ensure that all wiring  
and connections meet with applicable electrical codes or  
common sense practices. Mount terminal bases in an area,  
position, or cabinet that prevents accidental or unauthorized  
access to wiring with hazardous voltages.  
The isolation of the FP-RLY-420 is certified as double  
insulated for normal operating voltages of 250 Vrms. Do not  
use the FP-RLY-420 as the sole isolating barrier between  
human contact and working voltages of more than 250 Vrms.  
Specifications  
The following specifications are typical for the range  
–40 to +70 °C, unless otherwise noted.  
Input Characteristics  
Number of channels..........................8  
Relay type.........................................1 Form A (SPST)  
Nonlatching  
Maximum Switching Capacity (Resistive Load)  
AC ..............................................3 A at 250 VAC  
DC ..............................................3 A at 35 VDC  
2 A at 40 VDC  
1 A at 55 VDC  
0.4 A at 120 VDC  
Note Above 55 °C ambient, max. 1.5 A per channel.  
Minimum switching voltage.............10 mA at 5 VDC  
On resistance.....................................100 mΩ  
Off state leakage ...............................0.3 µA at 250 VAC  
Expected Life  
Mechanical .................................20 × 106 operations min.  
Electrical (at 30 cpm) .................300,000 operations at 3 A,  
35 VDC  
100,000 operations at 3 A,  
250 VAC  
FP-RLY-420  
10  
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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  
Isolation (CH–GND and CH–CH)....3,000 Vrms  
Safety isolation, working voltage  
(CH–GND only) ...............................250 Vrms, designed per IEC  
1010 as double insulated  
Physical  
Indicators ..........................................Green POWER and  
READY indicators, 8 green  
output state indicators  
Weight...............................................160 g (5.6 oz.)  
Power Requirements  
Power from network module ............1700 mW  
Environment  
Operating temperature ......................40 to +70 °C  
Storage temperature..........................55 to +100 °C  
Relative humidity..............................5% to 90% noncondensing  
CE Mark Compliance  
This product meets applicable EU directive(s) as follows:  
Safety isolation .................................EN 61010 (double insulation  
for 250 Vrms working  
isolation, installation  
category II)  
EMC Directive  
Immunity....................................EN 50082-1:1994  
Emissions ...................................EN 55011:1991 Group I  
Class A at 10 m  
© National Instruments Corp.  
11  
FP-RLY-420  
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Mechanical Dimensions  
Figure 6 shows the mechanical dimensions of the FP-RLY-420  
installed onto a terminal base. Dimensions are given in inches  
[millimeters].  
4.22 [107.19]  
4.31  
[109.5]  
3.60 [91.44]  
Figure 6. Mechanical Dimensions  
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