EKM Omnimeter I Instructions d'installation - Page 3
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eKM Metering Inc.
RS-485 and Pulse Output:
• Terminal 11 (A) connects to RS-485+ or T+ on the RS-485 network. Terminal 12 (B) connects to RS-485- or T-. Terminal 13 (G) is used for the RS-485
network (signal) ground if needed. Observe proper RS-485 network topology. Twisted pair wiring is recommended. Shielded twisted pair may be
beneficial in electrically noisy environments or for very long runs. RS-485 supports up to 256 devices on up to 4000 feet wire. Terminating resistors
may be beneficial.
• Terminals 14 and 15 are for pulse output. Pulse rate: 800 Impulse/kWh when set to 200A. Polarity sensitive. Maximum 27VDC, 27mA.
• Red LED on the meter face flashes 800 times/kWh(1 flash = 1.25Wh) when set to 200A.
All EKM meters, including the Omnimeter I v.3, have a Pulse Output. The Pulse Output pulses at a rate of 800 pulses per kilowatt hour when set to use
200 amp current transformers. This is the same rate that the red LED flashes on the meter face — 800 times/kWh. These are unpowered electronic dry
contact pulses that can be counted by standard electronic pulse counters. Pulse counters can be located up to 200 feet away from the Omnimeter.
*Note: Some Omnimeter I v.3 meters have a slightly different configuration for the pulse output terminals. These meters are identifiable by a sticker on
the meter case showing the different configuration. In the case of these meters, please follow the direction of the sticker, not of this spec sheet.
Working Principle:
When the meter is working, the energy consumed by the user is transformed into voltage and current signals, which are sampled by sample circuits. A
pulse signal is then produced by a specialized IC. The Pulse signal is directly proportional to power consumption. The MCU records and stores the
corresponding energy use. The LCD screen displays the energy use. Recorded information and data can be transferred using the RS485 interface.
Data:
The LCD display shows 15 pieces of data: total energy consumption(kWh), reverse kWh, voltage L1,voltage L2,voltage L3, current(Amps) L1, current L2,
current L3, power(watts) L1, power L2, power L3, total power(watts), COSθ(power factor) L1, COSθ L2, and COSθ L3. Every five seconds the LCD screen
will display a new piece of data.
15minutes, 30 minutes, or 60 minutes. The max demand can be reset to zero in software over RS485. The meter has four time-of-use tariffs(T1, T2, T3,
T4) to calculate the power during different time periods, and it can set up to four time periods per day, and specify the number of the tariff for that
period(from T1 to T4). The meter time can be set using the RS485 interface. By design the kWh cannot be reset.
without power and still keep its kWh readings. In other words, the memory will not be erased if there is no power.
#
01
02
03
04
05
Transport and Handling:
The meter should be handled with care, as there are precision components inside that could break and/or cause faulty readings should the meter
become damaged. The process of transportation, handling, and installation should be done according to the transportation and storage rule of
GB/T15464-1995. Keep the meter in the original packaging when stored. The storage temperature range should be 0–40ºC. The relative humidity
should be ≤85%. There should be no toxic chemicals present and no corrosive substances or gases in the air. The meters should be stacked on a
platform no more than ten units high.
Warranty:
Within two years from the date of sale, and on the condition that the user abide by the specifications and installation instructions listed here, and the
sealing is kept completely intact. If the meter does not correspond with the rule of the enterprise standard, the meter shall be repaired free or replaced.
EKM Metering Inc. – www.ekmmetering.com – [email protected] – (831)425-7371
SO
RS485
_ +
G
B
A
16 15 14 13 12 11
(Fig 6)
The meter also provides max demand(kW) data and the demand period can be set to one of three intervals:
LCD Display Data
Total kWh (forward + reverse)
Reverse kWh
Volts L1 (Line 1)
Volts L2
Volts L3
CT Ratio
100/26.6
200/26.6
400/26.6
800/26.6
1500/26.6
3000/26.6
5000/26.6
#
LCD Display Data
06
Amps L1
07
Amps L2
08
Amps L3
09
Watts L1
10
Watts L2
Impulse Constant
1600
800
400
200
106.67
53.33
32
(Fig 7)
The meter will go at least 30 years
See Figure 8 for meter display values:
#
LCD Display Data
11
Watts L3
12
Watts Total
13
Cosϴ L1 (Power Factor)
14
Cosϴ L2
15
Cosϴ L3
(Fig 8)