Current and Voltage Controls 3-Phase Asymmetrical Relay Type H 471 • Mains network quality and load monitoring relay • Monitors phase sequence, phase loss, phase asymmetry and phase angle • Measures asymmetry on 3-ph. voltage without neutral • Built-in adjustable timer function • Knob-adjustable asymmetry sensitivity • Output: 10 A SPDT relay • For mounting on DIN-rail in accordance with DIN/EN 50 022 • H4-housing • LED-indication for power supply and output ON • Power supply is the 3-phased measuring voltage Product Description 3-phase monitoring relay for DIN-rail mounting for phase sequence, phase loss, phase asymmetry and phase angle. Ordering Key Often used to control phase asymmetry in order to prevent any damage to the connected motors. H 471 156 380-50 Hz Housing Type Output Power supply Frequency Type Selection Plug Output Screw SPDT terminals Freq. Supply: 220 VAC Supply: 380 VAC Supply: 400 VAC 50 Hz 60 Hz H 471 156 220-50 Hz H 471 156 220-60 Hz H 471 156 380-50 Hz H 471 156 380-60 Hz H 471 156 400-50 Hz H 471 156 415-50 Hz H 471 156 400-60 Hz H 471 156 415-60 Hz Input Specifications Output Specifications Input Terminal 22 Terminal 23 Terminal 24 Output Rated insulation voltage Phase L3 Phase L2 Phase L1 measures on own supply Supply Specifications Power supply AC types Rated operational voltage Through term. 22, 23 & 24 220 Overvoltage cat. III (IEC 60664) (IEC 60038) 3 x 220 VAC ± 15%, 50 or 60 Hz 380 3 x 380 VAC ± 15%, 50 or 60 Hz 400 3 x 400 VAC ± 15%, 50 or 60 Hz 415 3 x 415 VAC ± 15%, 50 or 60 Hz Voltage interruption ≤ 40 ms Dielectric voltage None (supply/elect.) Rated impulse withstand volt. 4 kV (1.2/50 µs) (line/neutral, line/line), direct connection to electronics Rated operational power 3 VA Specifications are subject to change without notice (26.10.99) Contact ratings (AgCdO) Resistive loads AC 1 DC 1 or Small inductive loads AC 15 DC 13 Mechanical life Electrical life AC 1 Operating frequency Dielectric strength Dielectric voltage Rated impulse withstand volt. Supply: 415 VAC SPDT relay 250 VAC (rms) (cont./elect.) µ (micro gap) 10 A/250 VAC (2500 VA) 1 A/250 VDC (250 W) 10 A/25 VDC (250 W) 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) (cont./elect.) 4 kV (1.2/50 µs) (cont./elect.) (IEC 60664) 1 H 471 General Specifications τ = 0.2 s, worst case reaction time may be up to 5 x τ Adjustable delay on release built-in (0.2 s - 10s) Note: Reaction time + set time = actual delay on release time Reaction time Accuracy OFF delay 10 s, -1/+3 s on max. < o.1 s on min. Delay on release 0.2-10 s. adj. Time function Indication for Power supply ON Output ON Environment Degree of protection Pollution degree Operating temperature Storage temperature Weight Approval LED, green LED, red (IEC 60947-1) IP 20 B/front IP 40 D (IEC 60529) 3 (IEC 60664) -20° to +50°C (-4° to +122°F) -50° to +85°C (-58° to +185°F) 300 g CSA Wiring Diagrams Example 1 µ L3 L2 L1 H 471 Example 2 µ L3 L2 L1 H 471 Mode of Operation The knob-adjustable H 471 detects phase asymmetries of 2 to 12% of phase-phase amplitude. The relay operates when all three phases are present at the same time and the phase sequence is correct as well as the measured asymmetry/ unbalance is below set point (2 to 12% of phase asymmetry). Phase angle failures are registered as phase asymmetry. If the supply voltage drops to approx. 25% of the phasephase voltage, the relay releases without time delay. Applications of asymmetry I: Mains monitoring: Phase sequence. Phase loss. Phase amplitude asymmetry. II:Load monitoring: Phase sequence (direction of motor rotation). Fuse blowing. Example 1 Mains network monitoring The relay measures phase loss, that the power supply has correct phase sequence, that all three phases are present, and that the phase asymmetry is within the preset level. Setting The allowed asymmetry for the mains voltage amplitudes is set on the potentiometer. Example 2 Load monitoring The 3-phased monitoring relay for electrical loads ensures correct starting and operating conditions. The relay monitors phase sequence and consequently the correct direction of motor rotation. The most frequent cause of asymmetry and unbalance is fuse blowing. In this case the motor regenerates the interrupted phase. The size of the regenerated phase depends on the actual mechanical load and motor size. In this case it is a combination of phase amplitude and phase angle asymmetry higher than 2-3%. Setting Turn the asymmetry potentiometer counterclockwise (from max.) until the relay releases. Continue adjusting approx. 1 mark clockwise to ensure correct operation. At approx. 5% or less asymmetry, ensure that possible power supply variations do not result in erroneous release. Time/Range Setting Range setting Left potentiometer: Phase asymmetry sensitivity 2 to 12% of phase-phase amplitude. Adjustable on absolute scale. 2 Time setting Right potentiometer: Time setting on relative scale. Adjustable delay on release: 0.2 to 10 s. Specifications are subject to change without notice (26.10.99) H 471 Operation Diagram Phase L1, terminal 24 Phase L2, terminal 23 Phase L3, terminal 22 Set asymmetry Hysteresis Measured asymmetry Relay ON Specifications are subject to change without notice (26.10.99) 3