Wiring
KW2M-A/X User's Manual
19
Recommended cable
Use the transmission cables shown below for the Eco-POWER METER RS485 communication system.
Cable
Conductor
Insulator
Cable
diameter
Applicable cable
Size
Resistance (at
20°C
)
Material
Thickness
Twisted
pair cable
with shield
Min.
1.25mm
2
(AWG16)
Max.
16.8Ω/km
Polyethylene
Max.
0.5mm
Approx.
8.5mm
HITACHI
KPEV-S
1.25mm
2
×1P
Belden Inc. 9860
Min.
0.5mm
2
(AWG20)
Max.
33.4Ω/km
Polyethylene
Max.
0.5mm
Approx.
7.8mm
HITACHI
KPEV-S
0.5mm
2
×1P
Belden Inc. 9207
VCTF
Min.
0.75mm
2
(AWG18)
Max.
25.1Ω/km
PVC
Max.
0.6mm
Approx.
6.6mm
VCTF
0.75mm
2
×2C
(JIS)
Cable
Section
Notes
1) Use shielded type twisted pair cables.
2) Use only one type of transmission cable.
3) Do not mix different types of cables.
4) Use twisted pair cables under a bad noise
environment.
Twisted pair
cable with
shield
VCTF
4.9 Low Voltage Directive
In order to use the device under the measurement category III, install varistors or SPD between the lines
of power supply and the measured voltage input. Use the varistors or SPD compliant with European
standards and specifications to meet power supply and current.
When the device is to used in applications conforming to EN61010-1/IEC61010-1, make sure to satisfy
the following conditions.
1) RS485 communication part and pulse input part ensure only basic insulation. In order to ensure
reinforced (double) insulation demanded by EN 61010-1/ IEC61010-1, use a basic insulation or better
with load side and reinforced (double) insulation with the RS485 communication system side.
2) Provide the voltage input part with an EN60947-1 or EN60947-3 compliant circuit breaker.
3) Use a wire with basic insulation or better for a wire cramped (or connected) CT.
4) The Vn terminal should be connected to a grounded N-phase.
【
Environmental conditions
】
・
Overvoltage category III, Pollution degree 2
・
Indoor use
・
An ambient temperature of -10 to +50°C
・
An ambient non-condensing humidity of 30 to 85%RH (at 20°C)
・
Usable altitude: max. 2000m above sea level
【
Mount the product in a place with
】
・
A minimum of dust, and an absence of corrosive gases
・
No flammable, explosive gasses
・
Few mechanical vibrations or shocks
・
No exposure to direct sunlight
・
No large capacity electromagnetic switches or cables through which large current is flowing
Conductor Insulator
Jacket
Shield
Jacket
Conductor Insulator