Datasheet

ManualsBrandsCarlo Gavazzi ManualsAutomationMotor Load Monitoring Relay

Specifications are subject to change without notice (09.12.05) 1

Monitoring Relays

3-Phase Load Guard

Types DWB01, PWB01

• TRMS load guard relays for three phase

alanced applications

• 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 3-

phase balanced systems.

They can be used for moni-

toring 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

ϕ), that is

the ratio between the active

and the apparent power of a

motor.

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 func-

tion can be used to avoid

relay operation when not

desired (maintenance, tran-

sients).

The LED's indicate the state

of the alarm and the output

relay.

Type Selection

Mounting Output Supply: Supply: Supply: Supply:

208 to 240 VAC 380 to 415 VAC 380 to 480 VAC 600 to 690 VAC

DIN-rail

SPDT

DWB 01 C M23 10A

DWB 01 C M48 10A DWB01 C M69 10A

Plug-in

SPDT

PWB 01 C M23 10A

PWB 01 C M48 10A

Input Specifications

Input

oltage

(Own power supply):

3 - phase DWB01: L1, L2, L3

PWB01:

5, 6, 7

M23: 208 to 240 VAC ± 15%

DWB01CM48: 380 to 480 VAC ± 15%

PWB01CM48: 380 to 415 VAC ± 15%

DWB01CM69: 600 to 690 VAC ± 15%

1- phase DWB01CM23: L1, L2 (connect pins L2, L3)

PWB01CM23:

5, 6 (connect pins 6, 7)

208 to 240 VAC ± 15%

Curr

ent: DWB01: 5A, 10A: I1, I2

MI...: U1, U2

PWB01:

5A, 10A:

11, 10

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.

(30 s)

Direct input: 0.5 to 5A 30A

1 to 10A 50A

Standar

d CT (examples)

TADK2 50 A/5 A 5 to 50 A 60 A

TAD2 150 A/5 A 15 to 150 A 180 A

AD6 400 A/5 A 40 to 400 A

480 A

AD12 1000 A/5 A

100 to 1000 A 1200 A

TACO200 6000 A/5 A 600 to 6000 A 7200 A

MI CT ranges

MI 100

10 to 100 A

325 AAC

MI 500

50 to 500 A

1000 AAC

DWB01 PWB01

Ordering key

Housing

Function

Type

Item number

Output

Power Supply

Range

DWB 01 C M48 10A

Summary of content (6 pages)

PAGE 1
Monitoring Relays 3-Phase Load Guard Types DWB01, PWB01 DWB01 • TRMS load guard relays for three phase balanced applications • 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.
PAGE 2
DWB01, PWB01 Input Specifications (cont.) Output Specifications Note: The input voltage cannot raise over 300 VAC with respect to ground (PWB01 only) Contact input DWB01 PWB01 Disabled Enabled Pulse width Hysteresis Output Rated insulation voltage Contact ratings (AgSnO2) Resistive loads AC 1 DC 12 Small inductive loads AC 15 DC 13 Mechanical life Electrical life Terminals Z1, U1 Terminals 2, 9 > 10 kΩ < 500 Ω > 500 ms PF approx 0.1 SPDT relay 250 VAC µ 8 A @ 250 VAC 5 A @ 24 VDC 2.5 A @ 250 VAC 2.
PAGE 3
DWB01, PWB01 Mode of Operation (cont.) well as to a 3-phase asynchronous motor. The relay energizes as soon as the power supply is applied. After the power ON delay, the unit starts measuring cos ϕ. If cos ϕ is within the setpoints the relay is energized. As soon as the power factor drops below the lower setpoint or exceeds the upper setpoint the output relay releases and the red LED turns on after the set time has expired.
PAGE 4
DWB01, PWB01 Wiring Diagrams DWB01 - Direct connection PWB01 - Direct connection L3 L2 L1 Latch/Inhibit Contact L3 L2 L1 Latch/Inhibit Contact m m U1 U2 I1 cos j cos j Z1 L1 L2 L3 16 18 9 I1 15 I2 8 I1 DWB01 - Standard CT 2 cos j cos j 5 6 7 4 1 10 11 PWB01 - Standard CT L3 L2 L1 Latch/Inhibit Contact L3 L2 L1 Latch/Inhibit Contact m cos j cos j Z1 L1 L2 L3 16 m 18 I1 2 cos j cos j U1 U2 5 6 7 4 3 9 I1 15 I2 I1 DWB01 - MI CT 8 11 1 10 PWB01 - MI CT L
PAGE 5
DWB01, PWB01 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-phase loads and 1-phase loads, either through direct connection or external current metering transformer.
PAGE 6
DWB01, PWB01 Dimensions DIN-rail Plug-in 80 63 63 28.5 6 90 36 83.5 80 94 99.5 45 28.5 Specifications are subject to change without notice (09.12.