MODEL: 18WT

18WT SPECIFICATIONS

ES-1866 Rev.7 Page 2/4

http://www.m-system.co.jp/

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

INPUT

AVAILABLE

BURDEN (VA)

STD.RANGE

RANGE

VOLT.

CURR.

110V/1A

±100W

110V/5A

±500W

220V/1A

±200W

220V/5A

±1000W

INPUT

AVAILABLE

BURDEN (VA)

STD.RANGE

RANGE

VOLT.

CURR.

200V/1A

±200W

0.2

200V/5A

±1000W

/phase

•

3-phase / 3-wire

•

Single-phase / 2-wire

•

Single-phase / 3-wire

INPUT

AVAILABLE

BURDEN (VA)

STD.RANGE

RANGE

VOLT.

CURR.

110V/1A

±200W

±100 – ±240W

±500 – ±1200W

±200 – ±480W

±1000 – ±2400W

±50 – ±120W

±250 – ±600W

±100 – ±240W

±500 – ±1200W

±100 – ±240W

±500 – ±1200W

0.2

110V/5A

±1000W

/phase

220V/1A

±400W

0.4

220V/5A

±2000W

/phase

0.2

/phase

0.4

/phase

0.1/phase

0.5/phase

0.1/phase

0.5/phase

0.1/phase

0.5/phase

0.1/phase

0.5/phase

0.1/phase

0.5/phase

OUTPUT SPECIFICATIONS

500

1000W

0

3

OUT

5V

1

0

+1000W

-1000W

3

OUT

5V

1

■ OPERATION DIAGRAM (example)

INSTALLATION

Current consumption: Approx. 80 mA

Operating temperature: -5 to +55°C (23 to 131°F)

Operating humidity: 30 to 90 %RH (non-condensing)

Mounting: Standard Rack 18BXx or 18KBXx

Weight: 200 g (0.44 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)

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 1 or output 2 or

power)

500 V AC @ 1 minute (output 1 to output 2 to power)

2000 V AC @ 1 minute (input or output or power to ground)