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National Instruments FP-RLY-422 Operating Instructions Manual
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National Instruments FP-RLY-422 Operating Instructions Manual

National Instruments FP-RLY-422 Operating Instructions Manual

4-channel, spdt relay module
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OPERATING INSTRUCTIONS
FP-RLY-422
4-Channel, SPDT Relay Module
These operating instructions describe the installation, features, and
characteristics of the FP-RLY-422. For details on configuring and
accessing the FP-RLY-422 over a network, refer to the user manual
for the particular FieldPoint network module you are using with
the FP-RLY-422.
Features
The FP-RLY-422 is a FieldPoint relay output module with the
following features:
•
Four Single-Pole Double-Throw (SPDT) 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
Installation
The FP-RLY-422 mounts on a FieldPoint terminal base
(FP-TB-xx) unit. The hot plug and play operation of the
FP-RLY-422 allows you to install it onto a powered terminal base
without disturbing the operation of other modules or terminal
bases. The FP-RLY-422 receives operating power from the
terminal base.
FieldPoint ™ is a trademark of National Instruments Corporation. Product and company names
mentioned herein are trademarks or trade names of their respective companies.
322450A-01
© Copyright 1999 National Instruments Corp. All rights reserved.
September 1999

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Summary of Contents for National Instruments FP-RLY-422

  • Page 1 The FP-RLY-422 receives operating power from the terminal base. FieldPoint ™ is a trademark of National Instruments Corporation. Product and company names mentioned herein are trademarks or trade names of their respective companies. 322450A-01 ©...

  • Page 2: Field Wiring

    To install the FP-RLY-422, 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-422 module). 2. Align the FP-RLY-422 alignment slots with the guide rails on the terminal base.
  • Page 3 Figures 2a and 2b show examples of basic wiring connections. – Load N.Open I.Com N.Open I.Com Load I.Com N.Closed – I.Com Load N.Closed Load a. Total Current Less b. Total Current Greater Than 5 Amps Than 5 Amps Figure 2. Basic Field Connection © National Instruments Corp. FP-RLY-422...
  • Page 4 Relay Output Circuit The outputs of the FP-RLY-422 consist of four independent Form C electromechanical relays. The relays are break-before-make, but only if you do not exceed the specified relay operation speed. All relays remain in their power-up state or OFF state (N.Closed connected to I.Com) until the relay (Channel)
  • Page 5 Guidelines for Selecting Contact Protection Circuits, for more information. In addition, the FP-RLY-422 contains its own internal protection MOV to prevent excessively high voltage from being applied across the contacts. Each channel contains two MOVs: one between N.Closed and I.Com and one between N.Open and I.Com.
  • Page 6 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. This section has been reprinted with permission from American Zettler, Inc. FP-RLY-422 www.natinst.com...
  • Page 7 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 table. © National Instruments Corp. FP-RLY-422...

  • Page 8: Status Indicators

    FP-RLY-422. After receiving this initial information, the green READY indicator lights and the FP-RLY-422 is in its normal operating mode. In addition to the green POWER and READY indicators, each channel has two, green, output state indicators labeled FP-RLY-422 www.natinst.com...

  • Page 9: Isolation And Safety Guidelines

    (as the FP-RLY-422 is) for such an application. Even when a product like the FP-RLY-422 is used in applications with hazardous potentials, follow these guidelines to ensure a safe total system: •...

  • Page 10: Specifications

    • The isolation of the FP-RLY-422 is certified as double insulated for normal operating voltages of 250 Vrms. Do not use the FP-RLY-422 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 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. FP-RLY-422...
  • Page 12 Mechanical Dimensions Figure 6 shows the mechanical dimensions of the FP-RLY-422 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...