ConLAB WVT-3 User manual

1
WVT-3
Watt-Var Transducer
Operator’s Manual
Contents:
1. Calibration Instructions
2. Connection Diagrams
3. Dimensions
4. Specifications
1. CALIBRATION INSTRUCTIONS
The 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:
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
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 WVT-3 unit, set the Watt
and Var potentiometers for 4mA 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.
Three-Phase Connection
Single Phase Connection

2
WVT-3
Operator’s Manual
3. DIMENSIONS (mm)
4. SPECIFICATIONS
INPUTS
Connection: 1 or 3 phase, 3 wire, unrestricted
POWER FACTOR: Unity - to lead or lag zero
POWER CALIBRATION SPAN: 170 to 8500 Watt/Var
OVER RANGE: +42% (at full accuracy)
CURRENT
CURRENT RANGES: 0 - 1 to 0 - 5 Aac RMS
CURRENT OVER RANGE: +20% (at full accuracy)
PEAK OVERLOAD: 40 Aac RMS, for 5 sec. every 10
min. 50 Aac RMS, for 30 sec, every 10 minuets (opt.)
VOLTAGE
VOLTAGE RANGES: 0 - 85 to 0 - 500 Vac
VOLTAGE OVER-RANGE: +20% (at full accuracy)
VOLTAGE OVERLOAD (maximum 600 Vac):
Withstand 1.6 x [nom. rating] continuous, limited to 600Vac
POWER SUPPLY
SUPPLY RANGES: 115, 230 Vac -15/+25%
POWER OVERLOAD: Withstand 1.45 x [nom.
INPUT BURDEN
CURRENT: 0.26 VA @ 5 Aac
VOLTAGE: 0.15 VA @ 150 Vac, 0.3 VA @ 300 Vac
VOLTAGE (Vab) (at Self-power config.): 2.6 VA @ 150 Vac
SUPPLY: 2.4 - 2.6 VA @ 150/300 Vac at 20 mA output
ISOLATION:
Current Inputs: 2.5 KV RMS /1 minute
Voltage and power Inputs: 4KV RMS /1 minute
FREQUENCY RANGE: 45 - 440 Hz
FREQUENCY VARIATION EFFECT: < 0.02%/Hz for Watt output
< 0.1%/Hz for Var output
OUTPUTS (Watt or Var)
OUTPUT SPANS: -20 to +20mA, 0..1 to 0/4..20 mA
MAXIMUM OUTPUT LOAD: Rload KΩ= 16/Iout (mA)
LOAD VARIATION EFFECT: < ±0.03% (for full change)
RESPONSE TIME: < 200 msec (10-90% of span)
ACCURACY
±0.1% of span (typical), ±0.25% of span (max)
TEMPERATURE
OPERATING: -5 to +65°C
STORAGE: -35 to +85°C
TEMPERATURE STABILITY: Better than ±0.05/1°K
HUMIDITY: 5 - 95% relative, non condensed
HOUSING: Plastic Polycarbonate
PROTECTION LEVEL:
Box: According to IP-40
Terminals: According to IP-20
WEIGHT: 0.6 Kg