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OPERATING INSTRUCTIONS NI 9485 8-Channel Solid-State Relay (SSR) Digital Output Module.
NI 9485 Operating Instructions 2 ni.com These operating instructions desc ribe ho w to use the National Instruments 9485. For information about installing, conf iguring, and programming the syst em, refer to the system documentation.
© National Instruments Corp. 3 NI 9485 Operating Instructions Safety Guidelines for Hazardous V oltages If hazardous voltages are connected to the module, take the follow ing precautions. A hazardous voltage is a voltage greater than 42.4 V pk or 60 VDC to earth ground.
NI 9485 Operating Instructions 4 ni.com Figure 1 sho ws the NI 9939 connector backshell. Figure 1. NI 9939 Connector Backshell Safety Guidelines fo r Hazardous Loca tions The NI 9485 is suitable for u.
© National Instruments Corp. 5 NI 9485 Operating Instructions Caution Do not disconnect I/O-side wires or connectors unless power has been switched off or the area is known to be nonhazardous. Caution Do not remove modules unle ss power has been switched off or the area is known to be nonhazardous.
NI 9485 Operating Instructions 6 ni.com Special Conditions for Hazard ous Locations Use in Europe This equipment has been evalua ted as EEx nA II T4 equipment under DEMK O Certificate No. 03 A TEX 0324020X. The equipment is marked II 3G and is suitable fo r use in Zone 2 hazardous locations.
© National Instruments Corp. 7 NI 9485 Operating Instructions Table 1. T erminal Assignments Module Te r m i n a l Signal 0 CH0a 1 CH0b 2 CH1a 3 CH1b 4 CH2a 5 CH2b 6 CH3a 7 CH3b 8 CH4a 9 CH4b 10 CH5a.
NI 9485 Operating Instructions 8 ni.com Wiring for High-Vib ration Applications If an application is subject to hi gh vib ration, National Instruments recommends that you either use fe rrules to terminate wires to the detachable screw-term inal connector or use the NI 9939 backshell kit to protect the connections.
© National Instruments Corp. 9 NI 9485 Operating Instructions Connecting Loads to the NI 9485 Y ou can connect loads to the NI 9485. Connect the load to one of the leads of the power source. C onnect either the CHa or the CHb terminal to the load and the other terminal to the other lead of the A C or DC power source.
NI 9485 Operating Instructions 10 ni.com When you write an ON command to a channel, the SSR is closed and the terminal that is connected to the load allo ws current to flow or allows v o ltage to be applied to the load.
© National Instruments Corp. 11 NI 9485 Operating Instructions Figures 4 and 5 show examples of using an external flyback dio de to protect DC inducti ve loads and an MO V to protect A C inductive loads, respec tiv ely .
NI 9485 Operating Instructions 12 ni.com Figure 5. Contact Protection for AC Inductive Loads Sleep Mode This module supports a lo w-powe r sleep mode. Su pport for sleep mode at the system le vel depends on the chassis that the module is plugged into.
© National Instruments Corp. 13 NI 9485 Operating Instructions T ypically , when a system is in sleep mode, you cannot communicate with the modules. In sleep mode, the SSRs open to pre vent current from flowing through the load. Consequently , the system consumes minimal power and may dissipate less heat than it does in normal mode.
NI 9485 Operating Instructions 14 ni.com Switching current, per channel 1 All channels .... ........... ............ ..... 0.75 A max Up to four channels .......... .......... 1.2 A max Switching rate (90 % duty cycle) 1 ..... 1 operation per second Relay open time .
© National Instruments Corp. 15 NI 9485 Operating Instructions Power Requirements Power consumption from chassis Active mode ........ ........... ........... . 500 mW max Sleep mode . ........... ........... ......... . 5 mW max Thermal dissipation (at 70 °C) Active mode .
NI 9485 Operating Instructions 16 ni.com Safety Safety Voltages Connect only v oltages that are within these li mits. Channel a-to-Channel b ...... ............. . 60 VDC max, 30 V rms max Isolation Channel-to-channel Continuous ............... ......
© National Instruments Corp. 17 NI 9485 Operating Instructions Safety Standards The NI 9485 is designed to meet th e requirements of the following standards of safety for electric al equipment for me.
NI 9485 Operating Instructions 18 ni.com Environmental National Instruments C Series modules are in tended for indoor use only but may be used outdoors if inst alled in a suitable enclosure. Refer to the installation instructions for the chassis you are using for more information about me eting these specifications.
© National Instruments Corp. 19 NI 9485 Operating Instructions Shock and Vibration T o meet these specif ications, you must panel mount the system and either use ferrules to termi nate wires to the detachable scre w-terminal connector or use the NI 9939 backshell kit to protect the connections.
NI 9485 Operating Instructions 20 ni.com Note For EMC compliance, operate this de vice according to product documentation. CE Compliance This product meets the essentia l requirements of applicable Eu.
© National Instruments Corp. 21 NI 9485 Operating Instructions National Instruments Contact Information The National Instruments W eb site is your complete resource for technical support.
NI 9485 Operating Instructions 22 ni.com K orea 82 02 3451 3400, Lebanon 961 (0) 1 33 28 28, Malaysia 1800 887710, Mexico 0 1 800 010 0793, Netherlands 31 (0) 348 433 466, New Zealand 0800 553 322, No.
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