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 3-
phase balanced systems.
They can be used for moni-
toring the actual load of
asynchronous motors and
other symmetrical loads, as
well as the power consump-
tion 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 condi-
tion. Inhibit function can be
used to avoid relay operation
when not desired (mainte-
nance, 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 kΩ
< 500
Ω
> 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
(AgSnO
2
)
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 10
6
operations
≥
10
5
operations
(at 8 A, 250 V, cos
ϕ
= 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 +60°C, R.H. < 95%
-20 to +50°C, R.H. < 95%
-30 to +80°C, 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 µs)
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 mea-
sure the active power of a 3-
phase balanced system. The
relay has an adjustable pow-
er ON delay in order to avoid
undesired overload detec-
tion 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..., (con-
nected between U1 & U2) as
well as to a 3-phase asyn-
chronous 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 set-
points, the relay is ener-
gized, and the yellow LED is
ON. As soon as the power
drops below the lower set-
point 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 inter-
rupt 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 automati-
cally as soon as active pow-
er 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 mea-
sured 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 con-
nected 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 connect-
ed to a 3-phase asyn-
chronous 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 mea-
sure the active power. If it is
within the setpoints the relay
is energized. As soon as the
power drops below the low-
er setpoint or raises above
the upper setpoint the out-
put relay releases and the
red LED turns on after the
set time has expired. When
the start/stop contact is
opened the relay is immedi-
To
ately
de-energized.
2
Specifications are subject to change without notice (09.12.05)
DWB02, PWB02
Mode of Operation (cont)
restart the system just con-
nect 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 set-
ting the DIP-switches 5 and
6. To access the DIP-
switches 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
working
the
products’
mode.
Center knobs:
Setting of upper and lower-
level 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 man-
ages 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 cur-
rent 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
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