Carlo Gavazzi DWB01, PWB01 Catalog Page
Monitoring Relays
3-Phase Load Guard
Types DWB01, PWB01
DWB01 PWB01
• TRMS load guard relays for three phase
alanced applications
b
• Measuring if the power factor is within set limits
• Measure voltage on own power supply
• Measuring ranges: 5A, 10A, MI current transformers
• Power ON delay 1 to 30 s knob adjustable
• Separately adjustable upper/lower level on absolute
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 (DWB01) or plug-in module (PWB01)
• 45 mm Euronorm housing (DWB01) or 36 mm plug-in
module (PWB01)
• LED indication for relay, alarm and power supply ON
Product Description
DWB01 and PWB01 are
precise TRMS power factor
monitoring relays for 3phase balanced systems.
They can be used for monitoring the actual load of
asynchronous motors and
other symmetrical loads,
where the power factor is
almost proportional to the
load.
The relay measures the
power factor (cos
the ratio between the active
and the apparent power of a
motor.
ϕ), that is
Start/stop input allows to
use a manual switch to start
and stop the motor, without
the need of an auxiliary
device.
The advantage of using the
latch function is that the
relay can be kept energized
even after the end of the
alarm condition. Inhibit function can be used to avoid
relay operation when not
desired (maintenance, transients).
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 01 C M48 10A
Type Selection
Mounting Output Supply: Supply: Supply: Supply:
DIN-rail
Plug-in
SPDT
SPDT
208 to 240 VAC 380 to 415 VAC 380 to 480 VAC 600 to 690 VAC
DWB 01 C M23 10A
PWB 01 C M23 10A
PWB 01 C M48 10A
DWB 01 C M48 10A DWB01 C M69 10A
Input Specifications
Input
Voltage (Own power supply):
3 - phase DWB01: L1, L2, L3
1- phase DWB01CM23
ent:
r
Cur
Specifications are subject to change without notice (23.01.07) 1
PWB01: 5, 6, 7
DWB01CM48: 380 to 480 VAC ± 15%
DWB01CM69: 600 to 690 VAC ± 15%
PWB01CM23: 5, 6 (connect pins 6, 7)
M23: 208 to 240 VAC ± 15%
PWB01C 8: 380 to 415 VAC ± 15%
: L1, L2 (connect pins L2, L3)
208 to 240 VAC ± 15%
DWB01:
PWB01: 5A, 10A: 11, 10
5A, 10A: I1, I2
MI...: U1, U2
MI...:
9, 8
Measuring ranges Upper level Lower level
Power factor (cos ϕ) 0.1 to 0.99 0.1 to 0.99
AACrms Max. curr.
Direct input: 0.5 to 5A 30A
Standard CT (examples)
TADK2 50 A/5 A 5 to 50 A 60 A
AD2 150 A/5 A
T
TAD6 400 A/5 A 40 to 400 A 480 A
TAD12 1000 A/5 A 100 to 1000 A 1200 A
ACO200 6000 A/5 A 600 to 6000 A
T
MI CT ranges
MI 100 10 to 100 A 325 AAC
MI 500
1 to 10A 50A
15 to 150 A 180 A
50 to 500 A
(30 s)
7200 A
1000 AAC
WB01, PWB01
D
Input Specifications (cont.)
Note:
The input voltage cannot
raise over 300 VAC with
respect to ground (PWB01
only)
Contact input
DWB01 Terminals Z1, U1
PWB01 Terminals 2, 9
Disabled > 10 k
Enabled < 500 Ω
Pulse width > 500 ms
Hysteresis PF approx 0.1
Ω
General Specifications
Power ON delay 1 to 30 s ± 0.5 s
Reaction time (input signal variation from
Alarm ON delay < 200 ms
Alarm OFF delay < 200 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
Output relay ON LED, yellow
Environment
ee of protection IP 20
Degr
Pollution degr
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 DWB01 45 x 80 x 99.5 mm
W
eight
ew ter
Scr
Tightening torque Max. 0.5 Nm
ovals
Appr
CE-Marking Y
EMC Electromagnetic Compatibility
Immunity According to EN 61000-6-2
Emissions
ee
PWB01 36 x 80 x 94 mm
minals
-20% to +20% or from
+20% to -20% of set value)
during delay time)
3 (DWB01), 2 (PWB01)
Appr
ox. 250 g
acc. to IEC 60947
UL, CSA
es
ding to EN 61000-6-3
Accor
Output Specifications
Output SPDT relay
Rated insulation voltage 250 VAC
Contact ratings (AgSnO2)µ
Resistive loads AC 1 8 A @ 250 VAC
Small inductive loads AC 15 2.5 A @ 250 VAC
Mechanical life ≥ 30 x 106operations
Electrical life ≥ 105operations
Operating frequency ≤ 7200 operations/h
ielectric strength
D
Dielectric voltage ≥ 2 kVAC (RMS)
Rated impulse withstand volt. 4 kV (1.2/50 µs)
DC 12 5 A @ 24 VDC
DC 13 2.5 A @ 24 VDC
(at 8 A, 250 V, cos ϕ = 1)
ccording to EN 60947-1
A
Supply Specifications
Power supply Overvoltage cat. III
Rated operational voltage (IEC 60664, IEC 60038)
Through terminals:
DWB01: L1, L2, L3
PWB01: 5, 6, 7
M23 177 to 276 VAC 45 to 65 Hz
DWB01CM48 323 to 552 VAC45 to 65 Hz
PWB01CM48 323 to 477 VAC 45 to 65 Hz
Dielectric voltage None
Dielectric voltage
supply to output 4 kV
Rated operational power
DWB01CM69 510 to 793 VAC 45 to 65 Hz
M23: 9 VA @ 230 VAC, 50 Hz
M48: 13 VA @ 400 VAC, 50 Hz
M69:
21 VA @ 600 VAC, 50 Hz
Supplied by L1 and L2
Mode of Operation
DWB01 and PWB01 can be
used for monitoring the actual load of asynchronous
motors.
The relay measures the
absolute value for the power
factor of the system PF=
Active Power/Apparent Power that is for balanced system with sinus waveforms
the cosine of the angle
between motor current and
motor voltage (cos
As cos
ϕ varies with the load
of the motor, underload and
overload can be indirectly
detected by DWB01 and
PWB01.
The relation between the
load and cos
the type of motor
ϕ).
ϕ depends on
. As a
guideline to ensure correct
working conditions for a
motor, the upper level could
be set above the cos
marking on the motor, and
the lower level under this val
ue. It is anyway recommended to make the adjustment in
connection with a practical
test. The relay has an
adjustable power ON delay
in order to avoid overload
detection during motor star
Example 1
Latching mode, relay NE
In this application DWB01 or
PWB01 ar
external current metering
transformer, type MI..., (connected between U1 & U2) as
e connected to an
ϕ
-
t.
2 Specifications are subject to change without notice (23.01.07)
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