MODEL: KUWT

KUWT SPECIFICATIONS

ES-3658 Rev.9 Page 3/5

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

ON voltage: ≤ 1 V at 100 mA

• 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.

• How to Set Pulse Unit: The switches S1 through S5, VT and

CT ratios, and the transducer's calibration input range all

determine the relative value of one pulse, i.e. the number of

kWh per pulse.

VT Ratio × CT Ratio × Calibration Range [kW] ÷ (2.777 Hz ×

3600 [sec.] × 10 × Pulse Unit [kWh/pulse])

a1 thr. a4: integer, 1 though 9

a5: integer, 0 through 6

[example] VT 3300 / 110 V, CT 250 / 5 A, Pulse Unit 10

[kWh/pulse], Clibration Range 1000 [W]

3300 ÷ 110 × 250 ÷ 5 × 1 [kW] ÷ (2.777 Hz × 3600 [sec.]

S1 = 1, S2 = 5, S3 = 0, S4 = 0, S5 = 2

500

1000 W

0

12

OUT

20 mA

500

1000 W

0

5

OUT

10 V

4

0

+1000 W

-1000 W

12

OUT

20 mA

0

+1000 W

-1000 W

0

OUT

+10 V

4

-10 V

s OPERATION DIAGRAM (example)

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: 550 g (1.21 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 power to

ground)

1000 V AC @ 1 minute

(pulse output to voltage input or current input or DC output

or power or ground)

Impulse withstand voltage: 1.2 / 50 μsec., ±5 kV

(input to output or ground)