ES-1921 Rev.8
MEWT
Plug-in Signal Conditioners M-UNIT
WATT TRANSDUCER
Functions & Features
• Providing a DC output signal in proportion to AC active power
• Measuring bidirectional power flow
• DC output containing little ripple is ideal for computer input
• "Time division multiplication" method accepts distorted waveforms
• Isolation up to 2000 V AC
• High-density mounting
Typical Applications
• Centralized monitoring and control of power management system in a manufacturing facility or building
• SCR – Silicon Controlled Rectifier
MODEL: MEWT–[1][2][3]–[4][5]
ORDERING INFORMATION
• Code number: MEWT-[1][2][3]-[4][5]
Specify a code from below for each of [1] through [5].
(e.g. MEWT-11A-B/Q)
• Calibration range (e.g. 0 – 1000 W)
• VT ratio, CT ratio (e.g. VT 3300/110 V, CT 250/5 A)
• Special output range (For codes Z & 0)
• Specify the specification for option code /Q
(e.g. /C01/S01)
[1] CONFIGURATION
1
: 3-phase / 3-wire
2
: Single-phase / 2-wire
3
: Single-phase / 3-wire
[2] INPUT (unbalanced load)
1
: 110 V / 5 A AC
2
: 110 V / 1 A AC
3
: 220 V / 1 A AC
4
: 220 V / 5 A AC
A
: 100 V / 200 V / 1 A AC (single-phase / 3- wire)
B
: 100 V / 200 V / 5 A AC (single-phase / 3- wire)
[3] OUTPUT
Current
A
: 4 – 20 mA DC (Load resistance 600 Ω max.)
B
: 2 – 10 mA DC (Load resistance 1200 Ω max.)
C
: 1 – 5 mA DC (Load resistance 2400 Ω max.)
D
: 0 – 20 mA DC (Load resistance 600 Ω max.)
E
: 0 – 16 mA DC (Load resistance 750 Ω max.)
F
: 0 – 10 mA DC (Load resistance 1200 Ω max.)
G
: 0 – 1 mA DC (Load resistance 12 kΩ max.)
GW
: -1 – +1 mA DC (Load resistance 10 kΩ max.)
Z
: Specify current (See OUTPUT SPECIFICATIONS)
Voltage
1
: 0 – 10 mV DC (Load resistance 10 kΩ min.)
2
: 0 – 100 mV DC (Load resistance 100 kΩ min.)
3
: 0 – 1 V DC (Load resistance 1000 Ω min.)
4
: 0 – 10 V DC (Load resistance 10 kΩ min.)
5
: 0 – 5 V DC (Load resistance 5000 Ω min.)
6
: 1 – 5 V DC (Load resistance 5000 Ω min.)
1W
: -10 – +10 mV DC (Load resistance 10 kΩ min.)
2W
: -100 – +100 mV DC (Load resistance 100 kΩ min.)
3W
: -1 – +1 V DC (Load resistance 1000 Ω min.)
4W
: -10 – +10 V DC (Load resistance 10 kΩ min.)
5W
: -5 – +5 V DC (Load resistance 5000 Ω min.)
0
: Specify voltage (See OUTPUT SPECIFICATIONS)
[4] POWER INPUT
AC Power
B
: 100 V AC
C
: 110 V AC
D
: 115 V AC
F
: 120 V AC
G
: 200 V AC
H
: 220 V AC
J
: 240 V AC
DC Power
S
: 12 V DC
R
: 24 V DC
V
: 48 V DC
P
: 110 V DC
[5] OPTIONS
blank
: none
/Q
: With options (specify the specification)
SPECIFICATIONS OF OPTION: Q (multiple selections)
COATING (For the detail, refer to our web site.)
/C01
: Silicone coating
/C02
: Polyurethane coating
/C03
: Rubber coating
TERMINAL SCREW MATERIAL
/S01
: Stainless steel
GENERAL SPECIFICATIONS
Construction
: Plug-in
Connection
: M3.5 screw terminals
Screw terminal
: Chromated steel (standard) or stainless steel
Housing material
: Flame-resistant resin (black)
Isolation
: Voltage input to current input to output to power
Computation
: Time division multiplication
Overrange output
: Approx. -10 to +120 % at 1 – 5 V
Zero adjustment
: -5 to +5 % (front)
Span adjustment
: 95 to 105 % (front)
INPUT SPECIFICATIONS
Frequency
: 50 or 60 Hz
•
Current Input
Operational range
: 0 – 120 % of rating
Overload capacity
: 1000 % of rating for 3 sec., 200 % for 10 sec., 120 % continuous
•
Voltage Input
Operational range
: 0 – 120 % of rating
Overload capacity
: 150 % of rating for 10 sec., 120 % continuous
■
How To Determine Wattage Range
Calibration Range [W] = Measuring Wattage ÷ ((VT Ratio) × (CT Ratio))
Check that the required calibration range is within the available range in the table. Specify this range when ordering.
[example]
3-phase / 3-wire, measuring wattage 750 kW,
VT 3300/110 V, CT 250/5 A
750 × 10
3
[W] ÷ ((3300÷110) × (250÷5))= 0 – 500 [W]
OUTPUT SPECIFICATIONS
■ DC Current
: 0 – 20 mA DC and ± 1 mA
Minimum span
: 1 mA
Offset
: Max. 1.5 times span
Load resistance
: Output drive 12 V maximum; 10 V for [±] output
■
DC Voltage
: -10 – +12 V DC
Minimum span
: 5 mV
Offset
: Max. 1.5 times span
Load resistance
: Output drive 1 mA max. at ≥ 0.5 V
INSTALLATION
Power input
•
AC
: Operational voltage range: rating ±10 %,
50/60 ±2 Hz, approx. 2 VA
•
DC
: Operational voltage range: rating ±10 %,
or 85 – 150 V for 110 V rating, ripple 10 %p-p max.,
approx. 2 W (18 mA at 110 V)
Operating temperature
: -5 to +60°C (23 to 140°F)
Operating humidity
: 30 to 90 %RH (non-condensing)
Mounting
: Surface or DIN rail
Weight
: 400 g (0.88 lb)
PERFORMANCE in percentage of span
Accuracy
: ±0.5 %
Temp. coefficient
: ±0.05 %/°C (±0.03 %/°F)
Response time
: ≤ 1 sec. (0 – 90 %)
Ripple
: 0.5 %p-p max. (50/60 Hz)
The output ripple may increase when there is great difference between the frequencies of input signal and power supply.
Line voltage effect
: ±0.1 % over voltage range
Insulation resistance
: ≥ 100 MΩ with 500 V DC
Dielectric strength
: 2000 V AC @ 1 minute
(voltage input to current input to output to power to ground)
CONNECTION DIAGRAM
EXTERNAL DIMENSIONS unit: mm [inch]
TERMINAL ASSIGNMENTS unit: mm [inch]