53U
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: info@m-system.co.jp
EM-6485-B Rev.21 P. 3 / 52
■ ENVIRONMENT
• Indoor use.
• Do not install the unit where it is directly exposed to rain,
water droplets or sunlight.
• When heavy dust or metal particles are present in the
air, install the unit inside proper housing with sufficient
ventilation.
• Do not install the unit where it is subjected to continuous
vibration. Do not subject the unit to physical impact.
• Environmental temperature must be within -10 to +55°C
(14 to 131°F) with relative humidity within 90% RH in
order to ensure adequate life span and operation.
• Contrast of the LCD screen depends upon viewing angles.
Choose the height and angle where it is the most legible.
• Do not apply physical impact to the front face.
• To ensure the designated ingress protection, insert the
gasket as shown below before attaching the mounting
brackets.
Mounting Bracket
Panel
Gasket
■ WIRING
• Wiring to the unit must be conducted by qualified service
personnel.
• Do not install cables close to noise sources (relay drive
cable, high frequency line, etc.).
• Do not bind these cables together with those in which
noises are present. Do not install them in the same duct.
■ AND ....
• The unit is designed to function as soon as power is sup-
plied, however, a warm up for 10 minutes is required for
satisfying complete performance described in the data
sheet.
PERFORMANCE
Accuracy (at 23°C ±10°C or 73.4°F ±18°F, 45 – 65 Hz)
Voltage: ±0.3% (±0.2% for Option /H)*
Current: ±0.3% (±0.2% for Option /H)*
Power: ±0.5%*
Power factor: ±0.5%
Frequency: ±0.1%*
Energy: ±1% (±0.5% for Option /H)
Harmonic contents: ±1%*
Analog out put: Accuracy of assigned measurand or
±0.2%, whichever is greater.
Response time: ≤ 2 seconds (0 – 99%)
≤ 3 seconds for frequency and harmonic contents
* In percentage of the spans: 480V for voltage, 1A or 5A for
current, 4155W (5A) or 831W (1A) for active power. The de-
scribed accuracy levels are ensured at the input 1% or more
for phase 2 current with 3-phase/3-wire unbalanced load, for
neutral current with 3-phase/4-wire unbalanced load, and
neutral current with 1-phase/3-wire.
■ INPUT
Frequency: 50 – 60 Hz
Voltage Input
Rated voltage:
Line-to-line (delta voltage): 480V
Line-neutral (phase voltage): 277V
(for single phase/2-wire and single phase/3-wire)
Consumption VA: ≤ ULN
2
/ 300 kΩ / phase
Current Input
Rated current: 1A or 5A
Consumption VA: ≤ I
2
· 0.01 Ω / phase
Contact Input: 24V DC or 110V DC (input resistance 6 kΩ)
Auxiliary power supply:
100 – 240V AC, 8VA max., 50 – 60 Hz
110 – 240V DC, 4W max. (UL approval is not available)
■ OUTPUT
Modbus
Interface: Conforms to TIA/EIA-485-A
Protocol: Modbus RTU
DC Current Ou tput: 4 – 20mA DC, load resistance: 270 Ω
maximum
DC Voltage Out put: 1 – 5V DC, load resistance: 5000 Ω
minimum
Open Collector
Programmable for either alarm or energy count.
Max. rated load: 130V DC @50mA
Continuous rated load: 130V DC @30mA
■ Measurement category: CAT.III
■ Auxiliary power supply installation category: CAT.II
The denition of the measurement category
CAT.I: Circuits not directly connected to the main pow-
er supply
CAT.II: Circuits directly connected to low-voltage facility
CAT.III: Circuits in building facility
CAT.IV: Power sources for low-voltage facility
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