Monitoring Relays Tachometer Type SM 155 * Tachometer relay * Measuring ranges: 30 - 300 R.P.M. 200 - 2000 R.P.M. 1000 - 10000 R.P.M. * Knob-adjustable set level * Controlled by Namur/DIN 19234 sensor or metallic contact * Connection for moving-coil instrument * 10 A SPDT output relay * LED indication for relay ON * AC or DC power supply Product Description Ordering key SM155 monitors the actual RPMs of a motor by a Namur/DIN 19234 sensor or a metallic contact. Housing Function Output Type Power upply Measuring range Knob adjustable set level on relative scale. SM 155 230 10K Type Selection Plug Output Measuring range Circular 11 pins SPDT SPDT SPDT Supply: 24 VAC 30 - 300 R.P.M. SM 155 024 300 20 - 2000 R.P.M. SM 155 024 2K 1000 - 10000 R.P.M. SM 155 024 10K Supply: 115 VAC Supply: 230 VAC Supply: 24 VDC SM 155 115 300 SM 155 115 2K SM 155 115 10K SM 155 230 300 SM 155 230 2K SM 155 230 10K SM 155 724 300 SM 155 724 2K SM 155 724 10K Input Specifications Output Specifications Input Through terminals: Metallic contact: Namur sensor: Measuring ranges Types: 300: 2K: 10K: Inversion Short circuit current Pins 5, 6 Pins 6, 7 Connection cable Max resistance Hysteresis Output Instrument connection 5, 6 6, 7 30 to 300 R.P.M. 200 to 2000 R.P.M. 1000 to 10000 R.P.M. Interconnecting pins 8, 11 5 mA 10 mA Can be extended as desired 100 approx 3% of set value Specifications are subject to change without notice (13.03.01) Through pins Full scale deflection Internal resistance Rated insulation voltage Contact ratings (AgCdO) Resistive loads AC 1 DC 1 Small inductive loads AC 11 DC 11 Mechanical life Electrical life Operating frequency Dielectric strength Dielectric voltage SPDT relay Connection for moving-coil instrument 8, 9, pin 9 positive 1 mA 110 250 VAC 10A, 250 VAC 1 A, 250 VDC 2.5 A, 230 VAC 5 A, 24 VDC 30 x 106 operations 2.5 x 105 operations (at max load) 7200 operations/h 2 kVAC (rms) 1 SM 155 Supply Specifications General Specifications Power supply Rated operational voltage Through terminals 2, 10 024: 115: 230: 724: Dielectric voltage Transient protection Rated operational power AC models DC models Overvoltage cat. III (IEC 60664, IEC 60038) Reaction time 24 VAC 15%, 45 to 65 Hz 115 VAC 15%, 45 to 65 Hz 230 VAC 15%, 45 to 65 Hz 24 VDC 15% 2 kV > 3kV Accuracy of measurement Indication for Power supply ON Output relay ON Environment Degree of protection Operating temperature Storage temperature Housing dimensions Weight AC power supply DC power supply Approvals CE Marking 4 VA 2W Time between 2 pulses at the set value of the potentiometer 3% LED, green LED, red IP 20 -20 to +50C -50 to +85C 35 x 80 x 83 mm Approx. 200 g Approx. 125 g UL, CSA Yes Mode of Operation/Level Setting The relay is controlled by mechanical triggering, e.g. microswitch, reed relay, limit switch etc. (examples 1 and 2), or by electronic triggering, e.g. inductive or capacitive sensors (NAMUR/DIN 19234) (examples 3 and 4). Examples 1 and 3 The relay operates when the number of R.P.M. exceeds the set value. The relay releases when the number of R.P.M. is less than the set value. See hysteresis. Example 2 and 4 By interconnecting pins 8 and 11 the relay function is inverted, i.e. the relay releases when the number of R.P.M. exceeds the set value. The relay operates when the number of R.P.M. is less than the set value. See hysteresis. Instrument connection A moving-coil instrument with a scale calibrated in R.P.M. can be connected to the SM 155. The instrument has 1 mA full scale deflection. The relay generates max. 8.2 V on the instrument terminals (pins 8 and 9) across an internal resistance of 8.2 k in the relay. The ideal internal resistance of the instrument is 110 . A deviation in the internal resistance of 100 results in an error of 1%. Level Setting Knob adjustable on relative scale Wiring Diagrams Ex. 1, 2 - Mechanic triggering with metallic contact 2 Ex. 3, 4 - Electr. trig. with NAMUR/DIN 19234 sensor Specifications are subject to change without notice (13.03.01) SM 155 Operation Diagram Specifications are subject to change without notice (13.03.01) 3