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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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Table of Contents
Summary of Contents for National Instruments FP-RLY-420
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Page 1: Power Requirement
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. -
Page 2: Installation
The FP-RLY-420 receives operating power from the terminal base. To install the FP-RLY-420, refer to Figure 1 and follow these steps: 1. Slide the terminal base key to either position X (used for any module) or position 7 (used for the FP-RLY-420 module). -
Page 3: 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;... - Page 4 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.
- Page 5 DC loads or a metal oxide varistor (MOV) for AC loads. Refer to the next section, Guidelines for Selecting Contact Protection more information. © National Instruments Corp. N.O. I.C. Figure 3. Relay Output Circuit 80 100 120...
- Page 6 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.
- Page 7 Load CR Circuits Diagram Varistor Circuit Diagram © National Instruments Corp. 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.
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Page 8: 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 In-Rush Current Steady-state current 10 to 20 times the steady-state current... - Page 9 (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: •...
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Page 10: Specifications
• 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. - Page 11 This product meets applicable EU directive(s) as follows: Safety isolation ... EN 61010 (double insulation EMC Directive Immunity ... EN 50082-1:1994 Emissions ... EN 55011:1991 Group I © National Instruments Corp. maximum load oxide 1010 as double insulated READY indicators, 8 green...
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Page 12: Mechanical Dimensions
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...