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Monitoring Relays 3-Phase Load Guard Types DWA01, PWA01
* Cos 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
DWA01
PWA01
Product Description
DWA01 and PWA01 are precise over or under cos monitoring relays. The relays monitor their own power supply voltage and the current of a balanced 3phase system. 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.
Ordering key
Housing Function Type Item number Output Power Supply Range
DWA 01 C M48 5A
Type Selection
Mounting DIN-rail Plug-in Output SPDT SPDT Supply: 208 to 240 VAC DWA 01 C M23 5A PWA 01 C M23 5A Supply: 380 to 415 VAC 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: Measuring ranges Power factor (cos ) Direct input 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 Level 0.1 to 0.99 AACrms 0.5 to 5 A 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 Max. curr. 30A 30s 60 A 180 A 480 A 1200 A 7200 A Max. curr. 250 AAC 750 AAC 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 Note: The input voltage cannot raise over 300 VAC with respect to ground (PWA01 only). Hysteresis
~ cos = 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 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 = 1) 7200 operations/h
Operating frequency Dielectric strength Dielectric voltage 2 kVAC (rms) Rated impulse withstand volt. 4 kV (1.2/50 s)
Specifications are subject to change without notice (09.12.05)
1
DWA01, PWA01
Supply Specifications
Power supply Rated operational voltage through terminals: DWA01: PWA01: M23 DWA01CM48 PWA01CM48 Dielectric voltage supply to output Rated operational power Supplied by Overvoltage cat. III (IEC 60664, IEC 60038) 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 None 2kV 13 VA @400VAC L1 and L3
General Specifications
Power ON delay Reaction time 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 60C, R.H. < 95% -20 to 50C, R.H. < 95% -30 to 80C, 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
Function/Delay/Level Settings
Level setting (cos ): 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 OFF: Over cos 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 ). As cos varies with the load of the motor, overload (or underload) can be indirectly detected by DWA01 and PWA01. The relation between the load and cos 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 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 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 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 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.
2
Specifications are subject to change without notice (09.12.05)
DWA01, PWA01
Wiring Diagrams
DWA01 - Direct connection
L3 L2 L1 IL1 m I2 U1 U2 L1 L2 L3 12 14
PWA01 - Direct connection
L3 L2 L1 IL1 m 10 11
11
9
5
6
7
4
3
cos cos j
cos j cos
1
8
DWA01 - Standard CT
L3 L2 L1
PWA01 - Standard CT
L3 L2 L1
m I2 U1 U2 L1 L2 L3 12 14
11 10 9 5 6 7 4
m 3
cos j cos
11
cos cos j
1
8
DWA01 - MI CT
L3 L2 L1
PWA01 - MI CT
L3 L2 L1
m I2
Grey
m 14
Grey
L1 L2 L3
12
10 9
5
6
7
4
3
cos cos j
U2 11
cos cos j
11 8 1
DWA01CM235A - Direct connection - 1-Phase Load
L N I m I2 U1 cos j cos U2 11 L1 L2 L3 12 14
PWA01CM235A - Direct connection - 1-Phase Load
L N I m 10 9 11 cos j cos 8 1 5 6 7 4 3
Specifications are subject to change without notice (09.12.05)
3
DWA01, PWA01
Operation Diagrams
Overload monitoring Power supply
Level Hysteresis cos j cos 6s
Relay ON
Underload monitoring
Power supply Level Hysteresis cos j cos Relay ON 6s
Dimensions
DIN-rail
22.5 99.5
Plug-in
94
36
90
83.5
80
63
28.5
80
28.5
4
Specifications are subject to change without notice (09.12.05)
63

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