ES-1975 Rev.18
LWT
Power Transducer Series L-UNIT
WATT TRANSDUCER
(with pulse output)
Functions & Features
• Providing a DC output signal and pulse totalizer signal in proportion to AC active power
• Convenient pulse unit output (Wh×10
n
)
• 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: LWT–[1][2][3][4]–[5][6]
ORDERING INFORMATION
• Code number: LWT–[1][2][3][4]-[5][6]
Specify a code from below for each of [1] through [6].
(e.g. LWT-11A2-C/B/Q)
• Specify the specification for option code /Q
(e.g. /C01/S01)
• Calibration range (e.g. -750 – +750 W)
• VT ratio, CT ratio (e.g. VT 3300/110 V, CT 250/5 A)
• Special DC output range (For codes Z & 0)
• Pulse output (e.g. 6.666 Wh/pulse)
How To Determine Pulse Unit
[example]
3-phase / 3-wire, VT 3300/110 V, CT 250/5 A,
calibration range 750 W
•
From Pulse Unit
10 [kWh/pulse]
10 [kWh/pulse] / (3300/110) × (250/5)
= 6.666 × 10
–3
[kWh/pulse]
= 6.666 [Wh/pulse]
•
From Pulse Rate
150 [pulses/kWh]
1 / 150 [pulses/kWh]
= 6.666 × 10
–3
[kWh/pulse]
= 6.666 [Wh/pulse]
•
From Frequency
0.03125 Hz (at 100 %)
750 [W] / 0.03125 [H] × 3600 [s]
= 6.666 [Wh/pulse]
[1] CONFIGURATION
1
: 3-phase / 3-wire
2
: Single-phase / 2-wire
3
: Single-phase / 3-wire
4
: 3-phase / 4-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
5
: 220 V / 380 V / 1 A AC (3-phase / 4-wire)
6
:
220 V / 380 V / 5 A AC (3-phase / 4-wire)
7
: 110 V / 190 V / 1 A AC (3-phase / 4-wire)
8
:
110 V / 190 V / 5 A AC (3-phase / 4-wire)
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] DC 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.)
J
: 0 – 5 mA DC (Load resistance 2400 Ω max.)
FW
: -10 – +10 mA DC (Load resistance 1000 Ω max.)
GW
: -1 – +1 mA DC (Load resistance 10 kΩ max.)
JW
: -5 – +5 mA DC (Load resistance 2000 Ω 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] PULSE OUTPUT (open collector)
0
: None
1
: 2.777 Hz at 100 % input
2
: Specify pulse unit (within 0.006 – 3.12 Hz)
[5] AUXILIARY POWER SUPPLY
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
R
: 24 V DC
V
: 48 V DC
P
: 110 V DC
[6] OPTIONS (multiple selections)
Optional Process
blank
: None
/B
: Bonding
Other Options
blank
: none
/Q
: Option other than the above (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
: Stand-alone; terminal access at the front
Connection
: M3.5 screw terminals (torque 0.8 N·m)
Screw terminal
: Nickel-plated steel (standard) or stainless steel
Housing material
: Flame-resistant resin (black)
Isolation
: Voltage input to current input to DC output to pulse output to auxiliary power
Computation
: Time division multiplication
Overrange output
: Approx. -10 – +120 % at 1 – 5 V
Zero
adjustment(DC output)
: -5 to + 5 % (front)
Span adjustment(DC output)
: 95 to + 105 % (front)
INPUT SPECIFICATIONS
Frequency
: 50 or 60 Hz
• Voltage Input
Operational range
: 0 – 120 % of rating
Overload capacity
: 150 % of rating for 10 sec., 120 % continuous
• Current Input
Operational range
: 0 – 120 % of rating
Overload capacity
: 1000 % of rating for 3 sec., 200 % 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)) = 500 [W]
OUTPUT SPECIFICATIONS
■
DC Output
•
DC Current
: -10 – + 20 mA DC
Span
: Min. 1 mA, max. 20 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
■
Pulse output
: Open collector; 0 Hz at 0 W
(cutout at approx. 0.5 – 1.0 %)
Rating
: 35 V DC @ 100 mA
ON voltage
: ≤ 1 V at 100 mA
ON duration
: Max. 0.5 sec., min. approx. 50 msec.
Frequency range
:
0 – 2.777 Hz (0 – 100 %) standard; 0 – 0.006 Hz through 3.12 Hz is possible.
•
2.777 Hz at 100 % Input
[example] 1000 W calibration range
2.777 [Hz] × 3600 [s] / 1 [kW] = 10000 [pulses/kWh]
•
Specified Pulse Unit
: Refers to how much electrical energy (kWh) consumption at the primary of the VT and CT corresponds to the single output pulse per hour from the transducer.
Output Frequeny [Hz] = Calibration Range [kW] × VT Ratio × CT Ratio / Pulse Unit [kWh/pulse] × 3600 [s]
INSTALLATION
Auxiliary power supply
•
AC
: Operational voltage range: rating -15/+10 %,
50/60 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
: -10 to +55°C (14 to 131°F)
Operating humidity
: 30 to 85 %RH (non-condensing)
Mounting
: Surface or DIN rail
Weight
: 450 g (0.99 lb)
PERFORMANCE in percentage of span
Accuracy
: ±0.5 % (at 23°C ±10°C or 73.4°F ±18°F,
45 – 65 Hz)
Response time
: ≤ 2 sec. (0 – 100 % ±1 %)
Ripple
: 0.5 %p-p max.(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 DC output to pulse output to auxiliary power to ground)
Impulse withstand voltage
: 1.2 / 50 μsec., ±5 kV
(input to output or ground)
CONNECTION DIAGRAM
EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm [inch]
MOUNTING REQUIREMENTS unit: mm [inch]
EXPLANATIONS OF TERMS
• Bonding
An silicone adhesive reinforces the part, which is sensitive to vibration, on PWB. The improvement of vibration performance is not assured.