SAE J2544 pdf download

SAE J2544 pdf download.Plug-In Relay Test Methods.
1. This SAE Standard covers standard test methods for eiwironmental, mechanical, and electrical testing of plug-in relays used in surface vehicle electrical systems.
1.1 Purpose—This proposal specifies standard test conditions for the evaluation of plug-In relays used In surface vehicle applications.
2. References
2.1 Applicable Publications—The following publications form a part of this specification to the extent specified herein. Unless otherwise specified, the latest version of SAE publications shall apply.
2.1.1 SAE PuBLIcATIoN—Available from SAE, 400 Commonwealth Drive. Warrendale. PA 15096-0001.
SAE JI 113.42—Electromagnetic Compatibility—Component Test Procedure—Conducted Transient Emissions
2.1.2 CEI/IEC PuBucAtloN—Available from International Electrotechnical Commision. 3 rue de Vaembe. Geneva, SwTtzerland
CEI/IEC 529 (Code IP)—Degrees of Protection by Enclosures
2.2 Related Publications—The following publication is provided for information purposes only and is not required part of this document.
2.2.1 NATIONAL ASSOCIATION OF REL,Y MMIUFACTURERS PUBLICATION—Available from National Association of Relay Manufacturers (NARM), Milwaukee, WI 53217.
Relay Engineer’s Handbook
3. Definition
3.1 UOS—Unless otherwise specified.
4. TechnIcal Requirements
4.1 Mounting Conditions—To ensure proper function and to avoid physical damage, it is recommended to mount the relays in connectors/test fixtures so that:
a. The relay insertion force does not exceed the retention force of the weakest relay terminal (100 N for 2.8 to 6.3 mm, 150 N for 9.5 mm).
b. The relay terminals do not bend.
c. There is a minimum 5 mm gap to the next relay (for heat dissipation).
d. The wire size is appropriate for the load to dissipate heat from the relay (see Table 1 for wire size recommendations).
NOTE—The wire size, type. and length information is recommended as the default if not otherwise specified by the end user.
4.2.1.3 Pull-in Voltage
4.2.1.31 DefInition—Minimum voltage applied to the relay coil that causes the relay contacts to close (switch on).
4.21.3.2 Test Method
a. Apply a voltage across the coil terminals, starting with an applied voltage ot 0 to 3.0 V. Increment up at 0.10 to 0.25 V increments and record contact closure (pull-in voltage).
NOTE—Ramp-up rate of 0.1 to 5.0 V/s.
b. Contact closure is defined as the voltage drop across the contacts being less than or equal to 10% of the applied voltage.
4.2.1.4 SealVoltage
4.2.1.4.1 Definition—Minimum voltage applied to the relay coil that causes the armature to rest against the core (full travel).
4.2.1.4.2 Test Method
a. Apply a voltage across the coil terminals, starting with an applied voltage 0(0 to 3.0 V. Increment up at 0.10 to 0.25 V increments and record contact closure (pull-in voltage).
NOTE—Ramp-up rate of 0.1 to 5.0 V/s.
b. Monitor coil current using a suitable oscilloscope and current probe or other suitable current monitoring methods.
NOTE—Inductance change, results in a negative Current spike.
4.2.1.4.3 Alternate Method
a, Apply a voltage across the coil terminals, starting with an applied voltage of 0 to 3.0 V. Increment up at 0.10 to 0.25 V increments and record contact closure (pull-in voltage).
NOTE—Ramp-up rate of 0.1 to 5.0 V/s.
b. Increase the voltage to nominal voltage then reduce the voltage until the relay drop outs,
c. Increase the voltage to the pull-in voltage from step a” and reduce the voltage until the relay drops Out. If the difference between this voltage and the voltage from step b Is minimal, typically clV. the seal voltage is the pufl-in voltage.
d. If the drop-out voltage difference is not minimal, increase the voltage to a level above the pull-in voltage and repeat step c. If this voltage results in a minimal difference in the drop-out voltage, then this voltage is the seal voltage.
e. Repeat step “d” until a minimal difterence in drop-out voltage occurs.
4.2.1.5 Drop-Out Voltage
4.2.1.5.1 Definition-Maximum voltage applied to the relay coil that causes the relay contacts to open (switch-off).
4.2.1.5.2 Test Method
a. Apply a voltage greater than the seal voltage across the coil to insure the armature is sealed. Ramp or step down based on power supply at 0.1 to 5.0 V/s at 0.110 0.25 V increments until contacts open.
b. Contact opening is defined as the voltage drop across the contacts being greater than 10% of the applied voltage.