specifications are subject to change without notice (26.10.99) 1 current and voltage controls product description 3-phase and neutral moni- toring plug-in relay for sepa- rate upper and lower voltage control. often used to control all 3 phases and neutral where the supplied electrical power ordering key housing type output power supply ? monitoring relay for 3-phase upper/lower phase-phase neutral voltage control ? measures if all 3 phase-neutral voltages are within set limits ? measures on own power supply ? operates irrespective of phase sequence ? upper and lower limits separately adjustable ? built-in adjustable timer function ? output: 10 a spdt relay ? plug-in type module ? s-housing ? led-indication for power supply and output on ? power supply is the 3-phase + n measuring voltage is unstable or varies in value in order to monitor that the attached motors are perfor- ming as required. the s 1721 features built-in time delay. input specifications input pins 5, 6 & 7 arbitrary phase sequence pin 11 neutral measuring ranges (vac) power supply (phase-phase) 3x220 +n 3x380 +n 3x400+n 18% 18% 18% range (phase-neutral) 104-150 180-260 188-271 upper level 130-150 225-260 235-271 scale 102-118% 102-118% 102- 118% lower level 104-124 180-215 188-225 scale 82-98% 82-98% 82-98% power supply (phase-phase) 3x415+n 18% range (phase-neutral) 204-276 upper level 252-276 scale 102-118% lower level 204-228 scale 82-98% measures value of own supply. range equals rms value of a sinusoidal voltage output spdt relay rated insulation voltage 250 vac (rms) (cont./elect.) contact ratings (agcdo) (micro gap) resistive loads ac 1 10 a/250 vac (2500 va) dc 1 1 a/250 vdc (250 w) or 10 a/25 vdc (250 w) small inductive loads ac 15 2.5 a/230 vac dc 13 5 a/24 vdc mechanical life 3 30 x 10 6 operations electrical life ac 1 3 2.5 x 10 5 operations (at max. load) operating frequency 7200 operations/h dielectric strength dielectric voltage 3 2 kvac (rms) (cont./elect.) rated impulse withstand volt. 4 kv (1.2/50 s) (cont./elect.) (iec 60664) type selection plug output timer supply: 220 vac supply: 380 vac supply: 400 vac supply: 415 vac circular spdt yes s 1721 156 220 s 1721 156 380 s 1721 156 400 s 1721 156 415 circular spdt no syy 155 220 syy 155 380 syy 155 415 3 phase-neutral max. and min. voltage control types s 1721, syy 155 output specifications s 1721 156 220
2 specifications are subject to change without notice (26.10.99) sockets ? s 411 hold down spring ? hf mounting rack sm 13 socket covers bb 4 front mounting bezel frs 2 potentiometer lock pl 2 for further information refer to "accessories". accessories time/range setting range setting upper potentiometer: adjustment of upper limit in percent. middle potentiometer: adjustment of lower limit in percent. hysteresis 1-3% of rms-value time setting bottom potentiometer: time setting on relative scale (not syy 155). time adjustable delay on release: 0.2 to 10 s s 1721, syy 155 reaction time t = 2 s, worst case reaction time may be up to 5 x t adjustable delay on release built-in (0.2s - 10s) note : reaction time + set time = real delay on release time accuracy off delay 10s, -1/+3 s on max. < 0.1 s on min. time function delay on release 0.2-10 s. adj. indication for power supply on led, green output on led, red environment (iec 60947-1) degree of protection ip 20 b (iec 60529) pollution degree (iec 60664) 1: s 1721 380/400/415 syy 155 380/415 2: s 1721 220, syy 155 220 operating temperature -20 to +50c (-4 to +122f) storage temperature -50 to +85c (-58 to +185f) weight 200 g approvals ul, csa power supply ac types overvoltage cat. iii (iec 60664) rated operational voltage (iec 60038) through pins 5, 6, 7 & 11 220 3 x 220 vac 18%, (neutral) 45 to 65 hz 380 3 x 380 vac 18%, 45 to 65 hz 400 3 x 400 vac 18%, 45 to 65 hz 415 3 x 415 vac 18%, 45 to 65 hz voltage interruption 40 ms dielectric voltage none (supply/elect.) rated impulse withstand volt. 4 kv (1.2/50 s) (line/neutral, line/line), direct connection to electronics internal measuring circuit is connected to pins 5 & 11 rated operational power 3.5 va mode of operation connected to 3 phases and neutral, the s 1721 and syy 155 measure sinusoidal vol- tages. the phase sequence is arbitrary. the relay operates as long as all 3 phase-neutral voltages are within the set upper and a lower limit. the two limits are set separately. for s 1721 applies that if one or more of the phase-neutral voltages rises above the up- per limit or drops below the lower limit, the relay releases after the set time period whereas syy 155 releases immediately. the relay operates again when all 3 phase-neutral vol- tages are within set limits. hysteresis on operate is 2%. example 1 mains monitoring the relay measures if the 3 phase-neutral voltages are within the upper and lower limits. the limits are adjusted on the two built-in potentio- meters. example 2 monitoring load supply the relay can protect loads, such as heating elements, against overvoltage and thereby against increase in current, which could other wise destroy the heating elements. undervoltage to ohmic loads causes insufficient heating capacity, and this can also be monitored. the relay cannot be used for load monitoring if the load is a motor, as the regenerated phase voltage at e.g. fuse blowing is indefinable and dependent on the mechani- cal performance when the failure occurs. supply specifications general specifications
specifications are subject to change without notice (26.10.99) 3 operation diagrams s 1721 upper limit hysteresis lower limit hysteresis relay on phase l1, l2 and l3 syy 155 upper limit hysteresis lower limit hysteresis relay on phase l1, l2 and l3 s 1721, syy 155 wiring diagrams s 1721, syy 155 s 1721, syy 155 example 1 example 2
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