Monitoring Relays 3-Phase Load Guard Types DWA01, PWA01 DWA01 • Cos ϕ monitoring relays • Measuring if power factor is within set limits • Measure on own power supply (voltage) and current for balanced systems • Measuring ranges for current: 5A and MI current transformers range • Power ON delay 1, 2 or 6 s selectable • Knob adjustable level on absolute scale • Output: 8 A SPDT relay Normally Energized • For mounting on DIN-rail in accordance with DIN/EN 50 022 (DWA01) or plug-in module (PWA01) • 22.5 mm Euronorm housing (DWA01) or 36 mm plug-in module (PWA01) • LED indication for power supply and output ON PWA01 Product Description Ordering key DWA01 and PWA01 are precise over or under cos ϕ monitoring relays. The relays monitor their own power supply voltage and the current of a balanced 3phase system. Housing Function Type Item number Output Power Supply Range For current measure direct connection, 5A standard current transformers and MI CT can be used. The LED's indicate the state of the alarm and the output relay. DWA 01 C M48 5A Type Selection Mounting Output Supply: 208 to 240 VAC Supply: 380 to 415 VAC DIN-rail Plug-in SPDT SPDT DWA 01 C M23 5A PWA 01 C M23 5A PWA 01 C M48 5A Supply: 380 to 480 VAC DWA 01 C M48 5A Input Specifications Input Voltage (Own power supply): 3 - phase DWA01: PWA01: M23: DWA01CM48: PWA01CM48: 1- phase DWA01CM235A: PWA01CM235A: Current DWA01: PWA01: L1, L2, L3 5, 6, 7 208 to 240 VAC ± 15% 380 to 480 VAC ± 15% 380 to 415 VAC ± 15% L1, L3 5, 7 208 to 240 VAC ± 15% 5A: Y1, Y2 MI CT: Y1, Y3 5A: 7, 5 MI CT: 7, 6 Measuring ranges Power factor (cos ϕ) Level 0.1 to 0.99 Direct input AACrms 0.5 to 5 A Max. curr. 30A 30s Standard CT (examples) TADK 2 50 A/5 A TAD 2 150 A/5 A TAD 6 400 A/5 A TAD 12 1000 A/5 A TACO 200 6000 A/5 A MI CT ranges MI 100 MI 500 5 to 50 A 15 to 150 A 40 to 400 A 100 to 1000 A 600 to 6000 A AAC rms 10 to 100 A 50 to 500 A 60 A 180 A 480 A 1200 A 7200 A Max. curr. 250 AAC 750 AAC Specifications are subject to change without notice (09.12.05) Note: The input voltage cannot raise over 300 VAC with respect to ground (PWA01 only). Hysteresis ~ cos ϕ = 0,02 - fixed Output Specifications Output Rated insulation voltage Contact ratings (AgSnO2) Resistive loads AC 1 DC 12 Small inductive loads AC 15 DC 13 Mechanical life Electrical life SPDT relay 250 VAC µ 8 A @ 250 VAC 5 A @ 24 VDC 2.5 A @ 250 VAC 2.5 A @ 24 VDC ≥ 30 x 106 operations ≥ 105 operations (at 8 A, 250 V, cos ϕ = 1) ≤ 7200 operations/h Operating frequency Dielectric strength Dielectric voltage ≥ 2 kVAC (rms) Rated impulse withstand volt. 4 kV (1.2/50 µs) 1 DWA01, PWA01 Supply Specifications General Specifications Power supply Rated operational voltage through terminals: DWA01: PWA01: M23 DWA01CM48 PWA01CM48 Overvoltage cat. III (IEC 60664, IEC 60038) Power ON delay Reaction time Dielectric voltage supply to output Rated operational power Supplied by None 2kV 13 VA @400VAC L1 and L3 L1, L2, L3 5, 6, 7 177 to 276 VAC 45 to 65 Hz 323 to 552 VAC 45 to 65 Hz 323 to 477 VAC 45 to 65 Hz Function/Delay/Level Settings Level setting (cos ϕ): Knob adjustable on absolute scale, from 0.1 to 0.99 Setting of function and power ON delay Adjust the desired function (over or underload monitoring) with DIP switch 1 and the power ON delay with DIP Switches 3 and 4 as shown on the below table. To access the DIP-switch open the plastic cover using a screwdriver as shown on the left. Monitoring function ON: Under cos ϕ OFF: Over cos ϕ Alarm ON delay Alarm OFF delay Accuracy Temperature drift Repeatability Indication for Power supply ON Output ON Environment Degree of protection Pollution degree Operating temperature @ Max. voltage, 50 Hz @ Max. voltage, 60 Hz Storage temperature Housing dimensions DIN-rail version Plug-in version Weight Screw terminals Tightening torque Approvals CE-Marking EMC Immunity Emission 1, 2, or 6 s ± 0.5 s (input signal variation from -20% to +20% or from +20% to -20% of set value) < 400 ms < 400 ms (15 min warm-up time) ± 1000 ppm/°C ± 0.5% on full-scale LED, green LED, yellow IP 20 3 (DWA01), 2 (PWA01) -20 to 60°C, R.H. < 95% -20 to 50°C, R.H. < 95% -30 to 80°C, R.H. < 95% 22.5 x 80 x 99.5 mm 36 x 80 x 94 mm Approx. 200 g Max. 0.5 Nm acc. to IEC 60947 UL, CSA Yes Electromagnetic Compatibility According to EN 61000-6-2 According to EN 61000-6-3 Not used Power ON delay SW3 SW4 OFF OFF: 6 sec ON OFF: 2 sec ON ON: 1 sec Mode of Operation DWA01 and PWA01 can be used for monitoring the actual load of asynchronous motors. The relays measure the 3phase supply voltage and the current of the phase L1 connected to an asynchronous motor. The relay monitor the cosine of the angle between motor current and motor voltage (cos ϕ). As cos ϕ varies with the load of the motor, overload (or 2 underload) can be indirectly detected by DWA01 and PWA01. The relation between the load and cos ϕ depends on the type of motor. As a guideline to ensure correct working conditions for a motor, the level could be set above (or below) the cos ϕ marking on the motor. It is however recommended to make the adjustment in connection with a practical test. The relay has an inhibit delay at power ON in order to avoid overload detection during motor start. Example 1: Overload monitoring. The relay operates and the yellow LED is ON as long as cos ϕ is below the set limit. The relay releases when it exceeds the set level. Example 2: Underload monitoring. The relay operates and the yellow LED is ON as long as cos ϕ is above the set limit. The relay releases when it drops below the set level. Example 3: DWA01CM235A and PWA01CM235A can be used for monitoring the cos ϕ of a 1-Phase load with 208 to 240 V AC mains voltgage. In this case the power supply has to be connected between L1, L3 (or 5, 7) and L2 and L3 (or 6 and 7) have to be connected. Specifications are subject to change without notice (09.12.05) DWA01, PWA01 Wiring Diagrams DWA01 - Direct connection PWA01 - Direct connection L3 L2 L1 L3 L2 L1 IL1 IL1 m I2 U1 U2 L1 L2 L3 m 12 14 10 cos cos ϕ j 11 6 5 9 4 7 3 ϕ cos cos j 8 11 DWA01 - Standard CT 1 PWA01 - Standard CT L3 L2 L1 L3 L2 L1 m I2 U1 L1 L2 L3 m 12 14 10 9 cos ϕ j cos 11 U2 5 6 4 7 3 ϕ cos j cos 8 11 DWA01 - MI CT 1 PWA01 - MI CT L3 L2 L1 L3 L2 L1 m I2 L1 L2 L3 12 m 10 9 14 cos cos ϕ j Grey Grey U2 11 DWA01CM235A - Direct connection - 1-Phase Load 5 6 7 4 3 cos cos ϕ j 11 8 1 PWA01CM235A - Direct connection - 1-Phase Load L L N N I I m m I2 L1 L2 L3 12 14 10 9 5 6 7 4 3 11 cos j cos ϕ 8 U1 cos j cos ϕ U2 11 Specifications are subject to change without notice (09.12.05) 1 3 DWA01, PWA01 Operation Diagrams Overload monitoring Power supply Level Hysteresis cos ϕj cos 6s Relay ON Underload monitoring Power supply Hysteresis Level cos ϕ j cos 6s Relay ON Dimensions DIN-rail Plug-in 94 80 63 28.5 4 90 36 63 99.5 83.5 80 22.5 28.5 Specifications are subject to change without notice (09.12.05)