KW4M Eco-POWER METER (Discontinued Products)
We are sorry, the products have been discontinued. Please refer to the details of the discontinued products and the recommended substitutes list below.
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September 29, 2023 |
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Dimensions
KW4M
General tolerance : |
±1.0 ±0.39 |
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Panel Cut-out dimensions |
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Panel mounting diagram |
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How to mount
From the panel front, pass the main unit through the square holes. Insert the mounting frame from the
rear and push it in so that the gap between the mounting frame and the panel surface is minimized.
Tighten the screws (2 places) equally tight and check that there is no rattling. If the screws are overly
tightened, the frame may come off. In that case, loosen the screws and tighten them again pushing the
frame in.
Dedicated current transformers CT
Dedicated current transformer (CT) Clamp-on type 5A/50A (AKW4801B)
Dedicated current transformer (CT) Clamp-on type 100A (AKW4802B)
Dedicated current transformer (CT) Clamp-on type 250A (AKW4803B)
Dedicated current transformer (CT) Clamp-on type 400A (AKW4804B)
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Dedicated current transformer (CT) Through type 50A/100A (AKW4506B)
Dedicated current transformer (CT) Through type 250A/400A (AKW4507B)
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Terminal arrangement
Terminal layout
| No. |
Terminal type |
| Pin type |
Screw terminal type |
| 1 |
1, R, R |
RS-485(-) |
M3.5
screw
with
crossrecessed
/slotted
head |
| 2 |
2, N, S |
CT1(k )/IN |
| 3 |
3, T, T |
CT1(ℓ), CT2(ℓ) |
| 4 |
RS-485(+) |
CT2(k) |
| 5 |
RS-485(-) |
0V |
| 6 |
Pulse output(+) |
Pulse output(+) |
| 7 |
Pulse output(-) |
Pulse output(-) |
| 8 |
CT1(k)/IN |
1, R, R |
| 9 |
CT1(ℓ), CT2(ℓ) |
2, N, S |
| 10 |
CT2(k) |
3, T, T |
| 11 |
0V |
RS-485(+) |
| (Note): |
For 11-pin type, use DIN rail terminal block (ATC180041). |
Power measurement
Main unit wiring diagrams
Please connect a breaker (3 to 15A) to the voltage input part for safety reasons and to protect the device. Grounding the secondary side of VT (Voltage transformer) and CT (Current transformer) is not necessary with low-voltage circuit.
When measuring load with 100-200V system
Single-phase 2 wire system *One CT is required to measure. |
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Single-phase 3 wire system / Three-phase 3 wire system
*Two CTs are required to measure. |
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When measuring a load with exceed input voltage.
Voltage transformer (VT) is needed when you measure a load with over rated input voltage (240V).
Use VT, those secondary rating is 110V.
Grounding the secondary side of VT and CT is not necessary with low-voltage circuit.
Single-phase 2 wire system |
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Single-phase 3 wire system / Three-phase 3 wire system |
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Pulse measurement
Main unit wiring diagrams
Input connection
- Contact input
Use highly reliable metal plated contacts. Since the contact’s bounce time leads directly to error in the count value, use contacts with as short a bounce time as possible. In general, select 30Hz for max. counting speed.
- Non-contact input (Transistor input)
Connect with an open collector. Use the transistor with the following specifications.
VCEO=20V min. IC=20mA min. ICBO=6μA max
Use transistors with a residual voltage of less than 1.5V when the transistor is ON.
| Note: |
Short-circuit impedance should be less than 1kΩ.(When the impedance is 0Ω, drain current is approx. 5mA.)
The open-circuit impedance should be more than 100kΩ. |
- Input wiring
Please wire as short as possible by using a shielded wire or a metallic electric wire tube individually.If it is long, it may not work correctly due to floating capacitance of wire.
| Note: |
Operating power supply input part (measured voltage input) is not insulated to pulse input parts. So the input equipment must have the power supply transformer in which the secondary side is not
grounded with the primary and secondary sides insulated, in order to prevent interference of the power supply circuit when connecting the external input circuit. Be sure not to use an
auto-transformer. |
For Wiring terminal
- When using a crimp terminal, it should be with insulation sleeve applicable to M3.5 screw as shown below.
- Tightening torque: under 0.8N･m
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> Eco Series (Simple Watt-Hour Meter/ Simple Power-On Counter/ Power-On Hour Meter)
> KW4M Eco-POWER METER(Discontinued Products)
> Dimensions
