2
Specifications are subject to change without notice (16.10.08)
DWB02, PWB02
Supply Specifications
General Specifications
Power supply
Overvoltage cat. III
Rated operational voltage
(IEC 60664, IEC 60038)
Through terminals:
DWB02:
L1, L2, L3
PWB02:
5, 6, 7
M23
177 to 276 VAC 45 to 65 Hz
DWB02CM48
323 to 552 VAC 45 to 65 Hz
PWB02CM48
323 to 477 VAC 45 to 65 Hz
DWB02CM69
510 to 793 VAC 45 to 65 Hz
Dielectric voltage supply to output
4 kV
Rated operational power
M23
9 VA @ 230 V, 50 Hz
M48
13 VA @ 400 V, 50 Hz
M69
21 VA @ 600 V, 50 Hz
Supplied by L1 and L2
Power ON delay
1 to 30 s ± 0.5 s
Reaction time
(input signal variation from
-20% to +20% or from
+20% to -20% of set value)
Alarm ON delay
< 250 ms
Alarm OFF delay
< 250 ms
Accuracy
(15 min warm-up time)
Temperature drift
± 1000 ppm/°C
Delay ON alarm
± 10% on set value ± 50 ms
Repeatability
± 0.5% on full-scale
Indication for
Power supply ON
LED, green
Alarm ON
LED, red (flashing 2 Hz
during delay time)
Output relay ON
LED, yellow
Environment
Degree of protection
IP 20
Pollution degree
3 (DWB02), 2 (PWB02)
Operating temperature
@ Max. voltage, 50 Hz
-20 to +60°C, R.H. < 95%
@ Max. voltage, 60 Hz
-20 to +50°C, R.H. < 95%
Storage temperature
-30 to +80°C, R.H. < 95%
Housing
Dimensions
DWB02
45 x 80 x 99.5 mm
PWB02
36 x 80 x 94 mm
Weight
Approx. 250 g
Screw terminals
Tightening torque
Max. 0.5 Nm
acc. to IEC 60947
Approvals
UL, CSA
CE-Marking
Yes
EMC
Electromagnetic Compatibility
Immunity
According to EN 61000-6-2
Emission
According to EN 61000-6-3
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
measured power rises
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-
ately de-energized. To
Output Specifications
Output
SPDT relay
Rated insulation voltage
250 VAC
Contact ratings
(AgSnO
2
)
µ
Resistive loads
AC 1
8 A @ 250 VAC
DC 12
5 A @ 24 VDC
Small inductive loads AC 15
2.5 A @ 250 VAC
DC 13
2.5 A @ 24 VDC
Mechanical life
≥
30 x 10
6
operations
Electrical life
≥
10
5
operations
(at 8 A, 250 V, cos
ϕ
= 1)
Operating frequency
≤
7200 operations/h
Dielectric strength
Dielectric voltage
≥
2 kVAC (rms)
Rated impulse withstand volt. 4 kV (1.2/50 µs)
