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Monitoring Relays 3-Phase Active power Types DWB02, PWB02
* TRMS active power relays for three phase balanced applications * Measuring if active power is within set limits * Measuring voltage on own power supply * Measuring ranges: 5A, 10A, MI current transformers * Power ON delay 1 to 30 s knob selectable * Separately adjustable upper/lower level on relative scale * Programmable latching or inhibit at set level * Automatic and manual start and stop of the system * Output: 8 A SPDT relay N.D. or N.E. selectable * For mounting on DIN-rail in accordance with DIN/EN 50 022 (DWB02) or plug-in module (PWB02) * 45 mm Euronorm housing (DWB02) or 36 mm plug-in module (PWB02) * LED indication for relay, alarm and power supply ON
DWB02
PWB02
Product Description
DWB02 and PWB02 are precise TRMS active power monitoring relays for 3phase balanced systems. They can be used for monitoring the actual load of asynchronous motors and other symmetrical loads, as well as the power consumption by of system. Start/stop input allows to use a manual switch to start and stop the system, without the need of an auxiliary device. The advantage of using the latch function is that the alarm status can be kept even after the end of the alarm condition. Inhibit function can be used to avoid relay operation when not desired (maintenance, transitions). The LED's indicate the state of the alarm and the output relay.
Ordering key
Housing Function Type Item number Output Power Supply Range
DWB 02 C M48 10A
Type Selection
Mounting DIN-rail Plug-in Output SPDT SPDT Supply: 208 to 240 VAC DWB 02 C M23 10A PWB 02 C M23 10A Supply: 380 to 415 VAC PWB 02 C M48 10A Supply: 380 to 480 VAC DWB 02 C M48 10A Supply: 600 to 690 VAC DWB02 C M69 10A
Input Specifications
Input Voltage (Own power supply): 3 - phase DWB02: PWB02: M23: DWB02CM48: PWB02CM48: DWB02CM69: 1- phase DWB02CM23: PWB02CM23: Current: DWB02: PWB02: Measuring ranges Active power L1, L2, L3 5, 6, 7 208 to 240 VAC 15% 380 to 480 VAC 15% 380 to 415 VAC 15% 600 to 690 VAC 15% L1, L2 5, 6 208 to 240 VAC 15% 5A, 10A: I1, I2 MI...:U1, U2 5A, 10A: 11, 10 MI...: 9, 8 Upper level Lower level 10 to 110 % 10 to 110 % AACrms Max. curr. (30s) 0.5 to 5A 30A 1 to 10A 50A Standard CT (examples) TADK2 50 A/5 A TAD2 150 A/5 A TAD6 400 A/5 A TAD12 1000 A/5 A TACO200 6000 A/5 A MI CT ranges MI 100 MI 500 Note: The input voltage cannot raise over 300 VAC with respect to ground (PWB02 only) Contact input DWB02 PWB02 Disabled Enabled Pulse width Hysteresis 5 to 50 A 15 to 150 A 40 to 400 A 100 to 1000 A 600 to 6000 A 10 to 100 A 50 to 500 A 60 A 180 A 480 A 1200 A 7200 A 250 AAC 750 AAC
Direct input:
Terminals Z1, U2 Terminals 2, 9 > 10 k < 500 > 500 ms ~ 2% of set value - fixed
Specifications are subject to change without notice (09.12.05)
1
DWB02, PWB02
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
General Specifications
Power ON delay Reaction time Alarm ON delay Alarm OFF delay Accuracy Temperature drift Delay ON alarm Repeatability Indication for Power supply ON Alarm ON Output relay 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 to 30 s 0.5 s (input signal variation from -20% to +20% or from +20% to -20% of set value) < 250 ms < 250 ms (15 min warm-up time) 1000 ppm/C 10% on set value 50 ms 0.5% on full-scale LED, green LED, red (flashing 2 Hz during delay time) LED, yellow IP 20 3 (DWB02), 2 (PWB02) -20 to +60C, R.H. < 95% -20 to +50C, R.H. < 95% -30 to +80C, R.H. < 95% 45 x 80 x 99.5 mm 36 x 80 x 94 mm Approx. 250 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
Operating frequency Dielectric strength Dielectric voltage 2 kVAC (rms) Rated impulse withstand volt. 4 kV (1.2/50 s)
Supply Specifications
Power supply Rated operational voltage Through terminals: DWB02: PWB02: M23 DWB02CM48 PWB02CM48 DWB02CM69 Dielectric voltage supply to output Rated operational power M23 M48 M69 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 510 to 793 VAC 45 to 65 Hz 4 kV 9 VA @ 230 V, 50 Hz 13 VA @ 400 V, 50 Hz 21 VA @ 600 V, 50 Hz L1 and L2
Mode of Operation
DWB02 and PWB02 measure the active power of a 3phase balanced system. The relay has an adjustable power ON delay in order to avoid undesired overload detection during motor start. Example 1 Latching mode, relay NE In this application DWB02 or PWB02 is connected to an external current metering transformer, type MI..., (connected between U1 & U2) as well as to a 3-phase asynchronous motor. The relay is energized as soon as the power supply is applied. After the power ON delay, the unit starts to measure power. If it is within the setpoints, the relay is energized, and the yellow LED is ON. As soon as the power drops below the lower setpoint or raises above the upper setpoint the output relay releases after the set time has expired. To restart the measurement, connect Z1 and U1 (2 and 9) or interrupt the power supply for at least 1 s. Example 2 Non-latching mode, relay NE. DWB02 and PWB02 react as described in the previous example 1 except that the relay reactivates automatically as soon as active power is back within the two setpoints again. When the power rises measured above the adjusted upper level, the red LED starts flashing, and the output relay releases after the set time period. When the measured power drops below the adjusted lower level, the red LED starts flashing, and the output relay releases after the set time period. Example 3: DWB02CM2310A and PWB02CM2310A can be used for monitoring the power of a 1-Phase load with 208 to 240 V AC mains voltage. In this case the power supply has to be connected between L1, L2 (or 5, 6); L2 and L3 (or 6 and 7) have to be interconnected. Example 4 Start/stop mode, relay NE. In this application DWB02 or PWB02 are directly connected to a 3-phase asynchronous motor. The relay is energized as soon as the power supply is applied and the start/stop contact is closed. After the power ON delay, the unit starts to measure the active power. If it is within the setpoints the relay is energized. As soon as the power drops below the lower setpoint or raises above the upper setpoint the output relay releases and the red LED turns on after the set time has expired. When the start/stop contact is opened the relay is immediTo ately de-energized.
2
Specifications are subject to change without notice (09.12.05)
DWB02, PWB02
Mode of Operation (cont)
restart the system just connect the start/stop contact. Note 1: to use the start/stop function the output relay has to command a contactor in series to the load (see last two wiring diagrams). Note 2 (3-phase voltage): connect the 3-phase power supply to the terminals L1, L2 and L3 (DWB02) - 5, 6 and 7 (PWB02) taking care of the sequence.
Function/Range/Level/Time Setting
Select the desired function setting the DIP-switches 1 to 4 as shown on the right. Adjust the input range setting the DIP-switches 5 and 6. To access the DIPswitches open the plastic cover using a screwdriver as shown below. If DIP switch 3 is set to ON (start/stop) the position of DIP switch 4 does not affect the products' working mode. Center knobs: Setting of upper and lowerlevel from 10 to 110% of nominal power. Lower left knob: Setting of delay on absolute scale: 0.1 to 30 s. Lower right knob: Setting of power ON delay on absolute scale: 1 to 30 s.
Input current range (terminals I1, I2 or 10, 11) ON: 10A OFF: 5A/MI Relay status ON: Relay de-energized in normal condition OFF: Relay energized in normal condition Working mode ON: Contact input for start/stop functions OFF: Contact input for latch/inhibit functions Contact input (SW3 OFF) ON: Latch function enable OFF: Inhibit function enable Measuring range SW5 SW6 M23 M48 M69 ON ON 208 VAC 380 VAC 600 VAC ON OFF 220 VAC 400 VAC 690 VAC OFF OFF 240 VAC 480 VAC DWB02 only 600 VAC 690 VAC OFF ON 230 VAC 415 VAC
DWB02 Contact input
Z1 L1 L2 L3 16 18
U1 U2
P P I1
I2
15
Notes 1. DIP-switch 3 set ON enables the start/stop function that is managed by the closing-opening of the contact input. 2. DIP-switch 3 set OFF enables the input contact for the latch/inhibit functions: the selection between these is allows by the DIP switch 4. The following table shown as the input contact manages the mode of operation:
PWB02 Contact input
P P 9 8 11 10 2 2 5 6 7 4 3
Contact input working mode LATCH INHIBIT START/STOP CLOSED NOT ACTIVE ACTIVE START OPEN ACTIVE NOT ACTIVE STOP
Specifications are subject to change without notice (09.12.05)
3
DWB02, PWB02
Wiring Diagrams
DWB02 - Direct connection PWB02 - Direct connection
Latch/Inhibit Contact
Latch/Inhibit Contact
DWB02 - Standard CT
PWB02 - Standard CT
Latch/Inhibit Contact
Latch/Inhibit Contact
DWB02 - MI CT
PWB02 - MI CT
Latch/Inhibit Contact
Latch/Inhibit Contact
DWB02CM2310A - Direct connection - 1-Phase Load
PWB02CM2310A - Direct connection - 1-Phase Load
Latch/Inhibit Contact
Latch/Inhibit Contact
4
Specifications are subject to change without notice (09.12.05)
DWB02, PWB02
Wiring Diagrams (cont.)
With the start/stop function enabled, it's necessary to use the following wiring diagrams (which are two examples among many others). It is possible for both 3-phases loads and of 1-phase loads, either through direct connection or external current metering transformer. DWB02 - Direct connection - Manual start and stop (NE relay)
L3 L2 L1 N m P P U1 U2 I1 I1 I2 15 I1 Z1 L1 L2 L3 16 18 9 8 11 10 1 P P 2 5 6 7 4
PWB02 - Direct connection - Manual start and stop (NE relay)
L3 L2 L1 N m 3
Start/stop Contact
Start/stop Contact
Operation Diagrams
Latch function - NE relay
Power supply Latch contact (Closed = latch not active) Upper level Hysteresis Lower level Hysteresis Active power Relay ON
Power ON
T
Power ON
T
T
Inhibit function - ND relay
Power supply Inhibit contact (Closed = inhibit active) Upper level Hysteresis Lower level Hysteresis Active power Relay ON
Power ON
Power ON
Start and stop function - NE relay
Power supply Start/Stop contact (Closed = Start; Open = Stop) Upper level Hysteresis Lower level Hysteresis Active power Relay ON
Power ON
T
T
Specifications are subject to change without notice (09.12.05)
5
DWB02, PWB02
Dimensions
DIN-rail
45 99.5
Plug-in
94 90
36
83.5
80
63
28.5
80
28.5
6
Specifications are subject to change without notice (09.12.05)
63

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