Omega Products DRA-WVT-3 Installation Manual

User’s Guide

http://www.omega.com
e-mail: [e-mail]

DRA-WVT-3

Combined Watt-Var Transducer

Operator's Manual

USA:

ISO 9001 Certified

omega.com

SM

OMEGAnet

On-Line Service

http://www.omega.com

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It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI
regulations that apply. OMEGA is constantly pursuing certification of its
products to the European New Approach Directives. OMEGA will add the CE
mark to every appropriate device upon certification.
The information contained in this document is believed to be correct but
OMEGA Engineering, Inc. accepts no liability for any errors it contains, and
reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be
used for, patient connected applications.

Customer Service: 1-800-622-2378 / 1-800-622-BESTSM
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Contents:

1. CALIBRATION INSTRUCTIONS

2. CONNECTION DIAGRAMS

3. DIMENSIONS

4. SPECIFICATIONS

1. CALIBRA TION INSTRUCTIONS

The DRA-WVT-3 is a precision instrument and was
carefully and accurately calibrated.

Please do not change the internal potentiometers’
setting.

In order to change slightly the calibration setting,
please use the external Zero & Span potentiometers
on the unit’s panel

Please connect the unit to the calibrator according to
the following:

EXT. POWER

910

OPT.
EXT
PWR

OMEGA

ENGINEERING.INC.

Ic

20 19 17 16 15 14 12 11

CURRENT

OUTPUT

WATT

DVM

mA

+- - +

ZSSZ

WATT

VAR

CAL

CAL

WATT/VAR TRANSDUCER

Vcb

VOLTAGE
OUTPUT

SINGLE PHASE

POWER CALIBRATOR

For single-phase unit, the calibrator calculated
power (CP)
is: CP = Pmax
For Three-phase unit, the calibrator calculated
power (CP)
is: CP = Pmax/2

VAR

DVM
mA

3

2

1

COM

VAR

WATT

OUTPUT

DRA-WVT-3

Vab

Ia

Please follow the following instructions:
a. Set the calibrator to the desired maximum

input voltage. Set the output calculated power (CP).
Set Power Factor (P.F) = 1.0

b. With no power delivered to the DRA-WVT-3 unit,
set the Watt and Var potentiometers for 4.000mA
reading in both current meters.

c. Turn on the calibrator for full power. Tune the Watt’s
Span potentiometer to 20.000mA.

d. Set the P.F = 0 and tune the Var’s Span
potentiometer to 20.000mA.

2. CONNECTION DIAGRAMS

The power transducer is phase sensitive. Please keep
the voltage/current phases according to the following
diagrams.

+/- Io
(WATT)

EXT. POWER

910
OPT.
EXT

PWR

OMEGA

ENGINEERING. INC.

Ic

20 19 17 16 15 14 12 11

AA
BB
CC

ZSSZ

WATT

VAR

CAL

CAL

WATT/VAR TRANSDUCER

Vcb

WATT

Vab

3

2

COM

OUTPUT

DRA-WVT-3

+/- Io

(VAR)

1

VAR

Ia

Three-Phase Connection

LOAD

WATT

LOAD

VAR

EXT. POWER

3

910

ENGINEERING.INC.

ZSSZ

WATT

VAR

CAL

CAL

WATT/VAR TRANSDUCER

Vcb

OPT.

EXT

PWR

OMEGA

Ic

20 19 17 16 15 14 12 11

2

COM

WATT

OUTPUT

DRA-WVT-3

Vab

+/- Io
(WATT)

+/- Io

(VAR)

1

VAR

Ia

LOAD

WATT

LOAD

VAR

0

LINE

Single Phase Connection

3. DIMENSIONS mm (inch)

(2.87) 73

(3.90)

100

(4.41)

112

(4.45)

114

0

LOAD

4. SPECIFICATIONS

INPUTS

CONNECTION:

POWER FACTOR:
POWER CALIBRATION SPAN:

OVER RANGE:

CURRENT

CURRENT RANGES:
CURRENT OVER RANGE:
PEAK OVERLOAD:

VOLTAGE

VOLTAGE RANGES:
VOLTAGE OVER-RANGE:

VOLTAGE OVERLOAD
(maximum 600 Vac)

POWER SUPPLY

SUPPLY RANGES:

POWER OVERLOAD:

INPUT BURDEN

CURRENT:
VOLTAGE

VOLTAGE

power configuration):

:

:

(Vab) (at Self-

1 or 3 phase, 3 wire, unrestricted
Unity - to lead or lag zero
170 to 8500 Watt/Var
+42% (at full accuracy)

0 - 1 to 0 - 5 Aac RMS
+20% (at full accuracy)
40 Aac RMS, for 5 sec. every 10 min.

0 - 85 to 0 - 500 Vac
+20% (at full accuracy)

Withstand 1.6 x [nom. rating]
continuous, limited to 600Vac

115, 230 Vac -15/+25%
and Self-powered
Withstand 1.45 x [nom. rating]
continuous

0.26 VA @ 5 Aac

0.15 VA @ 150 Vac, 0.3 VA @
300 Vac

2.6 VA @ 150 Vac

SUPPLY:

2.4 - 2.6 VA @ 150/300
Vac at 20 mA output

ISOLATION:

CURRENT INPUTS:
VOLTAGE AND POWER
IINPUTS:
FREQUENCY RANGES:
FREQUENCY VARIATION
EFFECT:

2.5 KV RMS /1 minute

4KV RMS /1 minute
50, 60, 400 Hz (Factory set)
< 0.02%/Hz for Watt output
< 0.1%/Hz for Var output

OUTPUTS (Watt or Var)

OUTPUT SPANS:
MAXIMUM OUTPUT LOAD:

LOAD VARIATION EFFECT:
RESPONSE TIME:

-20 to +20mA, 0..1 to 0/4..20 mA
800 Ω
< ±0.03% (for full change)
< 200 msec (10-90% of span)

ACCURACY

±0.1% of span (typical), ±0.25%
of span (max)

TEMPERATURE

OPERATING:
STORAGE:
TEMPERATURE STABILITY:

HUMIDITY:
HOUSING:
PROTECTION LEVEL:

-5 to +65oC

-35 to +85oC
Better than ±0.01/1oC
5 - 95% relative, non-condensed
Plastic Polycarbonate
Box: According to IP-40
Terminals: According to IP-20

WEIGHT:

0.6 Kg

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and
workmanship for a period of 13 months from date of purchase. OMEGA Warranty adds an
additional one (1) month grace period to the normal one (1) year product warranty to cover
handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each
product. If the unit should malfunction, it must be returned to the factory for evaluation. OMEGA’s
Customer Service Department will issue an Authorized Return (AR) number immediately upon phone
or written request. Upon examination by OMEGA, if the unit is found to be defective it will be repaired
or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of
the purchaser, including but not limited to mishandling, improper interfacing, operation outside of
design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows
evidence of having been tampered with or shows evidence of being damaged as a result of excessive
corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or
other operating conditions outside of OMEGA’s control. Components which wear are not warranted,
including but not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products.
However, OMEGA neither assumes responsibility for any omissions or errors
nor assumes liability for any damages that result from the use of its products
in accordance with information provided by OMEGA, either verbal or written.
OMEGA warrants only that the parts manufactured by it will be as specified
and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR
IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES
INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF
LIABILITY: The remedies of purchaser set forth herein are exclusive and the
total liability of OMEGA with respect to this order, whether based on
contract, warranty, negligence, indemnification, strict liability or otherwise,
shall not exceed the purchase price of the component upon which liability
is based. In no event shall OMEGA be liable for consequential, incidental
or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic
Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical
applications or used on humans. Should any Product(s) be used in or with any nuclear installation
or activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility
as set forth in our basic WARRANTY / DISCLAIMER language, and additionally, purchaser will
indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising
out of the use of the Product(s) in such a manner.

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED
RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO
AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the outside
of the return package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to
prevent breakage in transit.

FOR WARRANTY RETURNS, please have the
following information available BEFORE
contacting OMEGA:

1. P.O. number under which the product was
PURCHASED,

2. Model and serial number of the product under
warranty, and

3. Repair instructions and/or specific problems
relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible.

This affords our customers the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 1996 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied,
photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable form,
in whole or in part, without prior written consent of OMEGA ENGINEERING, INC.

WARRANTY/DISCLAIMER

RETURN REQUESTS / INQUIRIES

NON-WARRANTY REPAIRS, consult

FOR
OMEGA for current repair charges. Have the
following information available BEFORE
contacting OMEGA:

1. P.O. number to cover the COST
of the repair,

2. Model and serial number of product, and

3. Repair instructions and/or specific
problems relative to the product.

Where Do I Find Everything I Need for

Process Measurement and Control?

OMEGA…Of Course!

TEMPERATURE

⻬ Thermocouple, RTD & Thermistor Probes,
Connectors, Panels & Assemblies

⻬ Wire: Thermocouple, RTD & Thermistor
⻬ Calibrators & Ice Point References
⻬ Recorders, Controllers & Process Monitors
⻬ Infrared Pyrometers

PRESSURE, STRAIN AND FORCE

⻬ Transducers & Strain Gauges
⻬ Load Cells & Pressure Gauges
⻬ Displacement Transducers
⻬ Instrumentation & Accessories

FLOW/LEVEL

⻬ Rotameters, Gas Mass Flowmeters & Flow Computers
⻬ Air Velocity Indicators
⻬ Turbine/Paddlewheel Systems
⻬ Totalizers & Batch Controllers

pH/CONDUCTIVITY

⻬ pH Electrodes, Testers & Accessories
⻬ Benchtop/Laboratory Meters
⻬ Controllers, Calibrators, Simulators & Pumps
⻬ Industrial pH & Conductivity Equipment

DATA ACQUISITION

⻬ Data Acquisition & Engineering Software
⻬ Communications-Based Acquisition Systems
⻬ Plug-in Cards for Apple, IBM & Compatibles
⻬ Datalogging Systems
⻬ Recorders, Printers & Plotters

HEATERS

⻬ Heating Cable
⻬ Cartridge & Strip Heaters
⻬ Immersion & Band Heaters
⻬ Flexible Heaters
⻬ Laboratory Heaters

ENVIRONMENTAL
MONITORING AND CONTROL

⻬ Metering & Control Instrumentation
⻬ Refractometers
⻬ Pumps & Tubing
⻬ Air, Soil & Water Monitors
⻬ Industrial Water & Wastewater Treatment
⻬ pH, Conductivity & Dissolved Oxygen Instruments

M-2765