Safety Monitoring Relays SR125SMS45 Stop Motion Sensing Unit • Power requirements—the SR125SMS45 will accept 24 VDC or 110 VAC • Motion detection input—the SR125SMS45 detects the stop condition of all types of AC or DC motors by sensing the motor’s back EMF across terminals Z1, Z2 and Z3 • Drive compatible—the SR125SMS45 will function with electronic motor control devices such as variable speed controllers, DC injection brakes, etc. • Selectable speed limit—the SR125SMS45 has 1 N/O and 1 N/C outputs that are switched when motor speed reaches the adjustable preset limit (0.01 to 0.10 V) for the particular output • Auxiliary output—the SR125SMS45 has 2 solid state auxiliary signaling outputs Specifications Electrical Power Supply: Power Consumption: Internal Fuse: Safety Inputs: Maximum Voltage Between Terminal Z1, Z2, Z3: Detection Threshold: Relay Outputs: Auxiliary Outputs: Max Switched AC: Max Switched DC: Min Switched Current/Voltage: Impulse Withstand Voltage: Max Drop-Out Time: Max Output Fuse: Reset Mode: Mechanical Mounting: Case Material: Max Wire Size: Weight: Color: External Adjustment: Indication: Environmental Enclosure Protection: Operating Temperature: Compliance Standards: All Models ±10% SR125SMS4501 24 VDC ≤3.0 W SR125SMS4502 110 VAC ≤5.2 VA Electronic Back EMF sensing between Z1 and Z2 and Z3 500 V (RMS) Conforms to EN60947-1/5, EN61000-6, EN62061, EN62061, EN ISO 12100-2, EN ISO 13849-1/2 UL listed CSA and TÜV Rheinland approved 0.01 V 1 N/O + 1 N/C switched at preset detection threshold 2 solid state for signaling Inductive AC-15, 1800 VA inrush, 180 VA maintained Inductive DC-13, 1.2-1.5 A/24 V 10 mA/17 V (provided that the contact has never been used with higher loads) 4000 V n/a 4 A slow-acting or 6 A fast-acting n/a 35 mm (1.38 in.) DIN rail Polyamide PA6.6 2 x 2.5 mm (14 AWG) stranded AC: 0.33 kg (11.6 oz.); DC: 0.23 kg (8.1 oz.) Red with black body Motor speed preset via potentiometer Green = Power On, Green = Channel 1 activated, Green = Channel 2 activated, Green = CH1 + CH2 activated IP20 terminals, IP40 (NEMA 1) housing -10 to 55°C (14 to 131°F) EN60947-1/5, EN61000-6, EN62061, EN62061, EN ISO 12100-2, EN ISO 13849-1/2 Approvals/Listings: CE-marked for all applicable directives, UL and C-UL, CSA, TÜV Specifications are subject to change without notice. Note: The safety contacts of the STI switches are described as normally closed (N/C)—i.e., with the guard closed, actuator in place, and the machine able to be started. www.omron247.com 1 SR125SMS45 Safety Monitoring Relays Application 24VDC, 110VAC K1 START L1 L2 L3 FUSE (AUX) K2 MOMENTARY PUSH BUTTON (AUX) (AUX) K1(a) K1 (AUX) K2(a) K2 (AUX) RESET MOMENTARY PUSH BUTTON STOP MOMENTARY PUSH BUTTON (AUX) FUSE LOCK RELEASE A1 MOMENTARY PUSH BUTTON GUARD CLOSED 3 2 9 S21 S14 S12 13 23 33 M + 10 21 7 22 SR103AM A1 K1 Z1 Z2 Z3 S10 S13 14 24 34 Logic 2 42 K1 K2 Operation A1 N P SUPPLY BROWN BLACK N A1 Y1 N 13 P 23 N 31 Y1 13 23 31 BLUESUPPLY BROWN BLACK BLUE MADE IN THE EC MADE IN THE EC POWER SMD03 POWER SMD03 OUTPUT OUTPUT Stop Motion Detection Stop Motion Detection EN 60204 EN 60204 BS EN 292 BS EN 292 SUPPLY BROWN BLACK A2 P Stop signal to motor N BLUESUPPLY BROWN BLACK BLUE P A2 Y2 P 14 N 24 P 32 Y2 14 24 32 Guard locking switch unlocks guard allowing safe access to machine SM125SMS45 detects back EMF of motor and senses when hazardous motion has ceased, then signals guard locking switch to unlock Terminal Connections A1 Z1 13 21 Y33/43 POWER BACK EMF SENSING SAFETY OUTPUT 1 N/O SAFETY OUTPUT 2 N/C AUXILIARY SIGNALING SOLID STATE 14 22 Z2 Z3 Y34 www.omron247.com Y33/43 22 Zero Speed Y34 Y44 SR125SMS45 FUSES LATCHING E-STOP BUTTON 21 A1/A2 K2 14 A2 EB Series 13 K1 Logic 1 8 A2 2 +24V K2 4 A2 CONTACT PROTECTION E.G. THERMAL CUT OUT 41 Relay control and fault monitoring + Power supply (S11 = 24 V) TL8018-5 1 S11 Y44 to PLC INDICATION BULB Shows Stopped Motion SR125SMS45 Safety Monitoring Relays Block Diagram A1 Z1 Z2 Z3 13 21 Y33/43 SR125SMS45 K1 LOGIC 1 A1/A2 LOGIC 2 Zero Speed K2 A2 14 22 Y34 Y44 Dimensions (mm/in.) 99 3.89 35 1.38 45 1.77 114 4.48 Ordering Model Supply Inputs Outputs Auxiliary Part No. SR125SMS4501 24 VDC Back EMF Sensing 1 N/O + 1 N/C 2 Solid State 44510-1271 SR125SMS4502 110 VAC Back EMF Sensing 1 N/O + 1 N/C 2 Solid State 44510-1272 www.omron247.com 3 Terms and Conditions of Sale 1. Offer; Acceptance. These terms and conditions (these "Terms") are deemed part of all quotes, agreements, purchase orders, acknowledgments, price lists, catalogs, manuals, brochures and other documents, whether electronic or in writing, relating to the sale of products or services (collectively, the "Products") by Omron Electronics LLC and its subsidiary companies (“Omron”). 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