Instruction/ maintenance manual of the product EIGHT CHANNEL SPST RELAY MODULE National Instruments
Go to page of 14
323617A-01 May 2003 © 2003 National I nstruments Corp. Al l rights res erved. FieldPoint™, Nati onal Instruments™, NI™, and ni.com™ are trademarks of National Instruments Corporation. Product and company names ment ioned herein are trademark s or trade names of their respecti ve companies.
cFP-RLY-421 2 ni.com Before you conf igure a FieldPoint system that uses a cFP-RL Y -421 module, calculate the total power consumption of the I/O modules on the FieldPoint bank. Y ou ca n find the po wer requirement specification in the operating inst ructions for ea ch I/O module .
© National Instruments Corp. 3 cFP-RLY-421 Figure 1. Installing the cFP-RL Y -421 Wiring the cFP-RL Y -421 The cFP-CB- x connector block has conne ctions for each of the eight cFP-RL Y -421 relay channels and for an external supply to power f ield devices.
cFP-RLY-421 4 ni.com T able 1 li sts the terminal assign ments for the signals of each channel. All of the COM terminals are conne cted internally and all of the V SUP terminals are connected inte rnally . NI does not recommend using them with the cFP-RL Y -421.
© National Instruments Corp. 5 cFP-RLY-421 Connecting Loads to the cFP-RL Y -421 W ire an external po wer supply to the load and IC terminal of the individu al channel as shown in Figure 2. This method of wiring keeps the electrical connections of the cFP-RL Y -421 within safe current limits.
cFP-RLY-421 6 ni.com In addition, the cFP-RL Y -421 has internal protection MO Vs to pre vent excessiv ely high voltag e from being applied across the contacts. The MO Vs are located between the NO and IC contacts of each relay . Howe ver , National Instruments still recommends the use of a protection circuit across an inductive load.
© National Instruments Corp. 7 cFP-RLY-421 Diode Circuit CR Circuits Varistor 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 lar ger voltages, use diode with rev erse breakdo wn 10 times circu it voltage an d forward load circuit.
cFP-RLY-421 8 ni.com In-Rush Current The type of l oad and its in-rush current charac teristics, together with switching frequency , can ca use contact welding. For loads with in-rush current, measure the steady state current and in-rush current to determine the proper rela y .
© National Instruments Corp. 9 cFP-RLY-421 Upgrading the FieldPoint Firmware Y ou may need to upgrade the FieldPoint f irmware when you add ne w I/O modules to the FieldPoi nt system. For information on determining which fi rmware you need and ho w to upgrade the firmw are, go to ni.
cFP-RLY-421 10 ni.com •D o not share the exter nal supply voltages (the V and C terminals) with other de vices (including othe r FieldPoint de vices), unless those devices ar e isolated from human contact. • Y ou must connect the protecti ve ea rth (PE) ground terminal on the cFP-BP- x backplane to the syst em safety ground.
© National Instruments Corp. 11 cFP-RLY-421 Specifications The follo wing specifications ar e typical for a range of – 40 to 60 °C unless otherwise noted. Relay Characteristics Number of channels ..................... ..... 8 Relay type ......... .
cFP-RLY-421 12 ni.com Physical Indicators ..... .............. ........... ........... . Green POWER and READY indicators, 8 green output state indicators W eight cFP-RL Y -421 .................... .......... 130 g (4.5 oz) Power Requirements Power from network modul e .
© National Instruments Corp. 13 cFP-RLY-421 Safety This product is designed to meet the requirements of the following standards of safety for electric al equipment for measurement, control, and laboratory use: • IEC 61010-1, EN 61010-1 • UL 3121-1, UL 61010C-1 • CAN/CSA C22.
cFP-RLY-421 14 ni.com Where to Go for Support For more information about settin g up the FieldPoint system, refer to these National Instruments documents: • FieldPoint network module user manual • Other FieldPo int I/O m odule operating instructions • FieldPoint connector bl ock operating instructions Go to ni.
An important point after buying a device National Instruments EIGHT CHANNEL SPST RELAY MODULE (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought National Instruments EIGHT CHANNEL SPST RELAY MODULE yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data National Instruments EIGHT CHANNEL SPST RELAY MODULE - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, National Instruments EIGHT CHANNEL SPST RELAY MODULE you will learn all the available features of the product, as well as information on its operation. The information that you get National Instruments EIGHT CHANNEL SPST RELAY MODULE will certainly help you make a decision on the purchase.
If you already are a holder of National Instruments EIGHT CHANNEL SPST RELAY MODULE, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime National Instruments EIGHT CHANNEL SPST RELAY MODULE.
However, one of the most important roles played by the user manual is to help in solving problems with National Instruments EIGHT CHANNEL SPST RELAY MODULE. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device National Instruments EIGHT CHANNEL SPST RELAY MODULE along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
