forlong DRT-301M User manual
DRT-301M User Manual
021-60975591/ 60975592
DRT-301M
Three phase DIN rail energy meter with multi-tariff
Seven modules
1.1 Safety instructions
1.2 Foreword
1.3 Performance criteria
1.4 Meter specification
1.5 RS485 communication specification
1.6 Far Infrared communication specification
1.7 Basic errors
1.8 Description
1.9 Dimensions
1.10 Installation
1.11 Operating
1.12 Troubleshooting
1.13 Technical support
User manual
DRT-301M User Manual
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1.1 Safety instructions
Information for Your Own Safety
This manual does not contain all of the safety measures operating the equipment (module, device) for
different conditions and requirements. However, it does contain information which you must know for
your own safety and to avoid damages. These information are highlighted by a warning triangle
indicating the degree of potential danger.
Warning
This means that failure to observe the instruction can result in death, serious injury or
considerable material damage.
Caution
This means hazard of electric shock and failure to take the necessary safety
precautions will result in death, serious injury or considerable material damage.
Qualified personnel
Operation of the equipment (module, device) described in this manual may only be performed by
qualified personnel. Qualified personnel in this manual means person who are authorized to
commission, start up, ground and label devices, systems and circuits according to safety and
Regulatory standards.
Use for the intended purpose
The equipment (device, module) may only be used for the application specified in the catalogue and
the user manual, and only be connected with devices and components recommended and approved
by Forlong.
Proper handling
The prerequisites for perfect, reliable operation of the product are proper transport, proper storage,
installation and proper operation and maintenance. When operating electrical equipment, parts of this
equipment automatically carry dangerous voltages. Improper handling can therefore result in serious
injuries or material damage.
Use only isulating tools.
Do not connect while circuit is live (hot).
Place the meter only in dry surroundings.
Do not mount the meter in an explosive area or expose the meter to dust, mildew and insects.
Make sure the wires are suitable for the maximum current of this meter.
Make sure the AC wires are connected correctly before activating the current/voltage to the
meter.
Do not touch the meter connecting clamps directly with metal, blank wire and your bare hands as
you may get electrical shock.
Make sure the protection cover is placed after installation.
Installation, maintenance and reparation should only be done by qualified personnel.
Never break the seals and open the front cover as this might influence the function of the meter,
and will cause no warranty.
Do not drop, or allow strong physical impact on the meter as the high precisely components inside
may be damaged.
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Disclaimer
We have checked the contents of this publication and every effort has been made to ensure that the
descriptions are as accurate as possible.
However, deviations from the description cannot be completely ruled out, so that no liability can be
accepted for any errors contained in the information given. The data in this manual is checked
regularly and the necessary corrections are included in subsequent editions. We are grateful for any
improvements that you suggest.
Subject to technical modifications without notice.
Copyright
Copyright Forlong July 2009 All rights Reserved.
It is prohibited to pass on or copy this document or to use or disclose its contents without our express
permission. Any duplication is a violation of the law and subject to criminal and civil penalties. All
rights reserved, particularly in the event of a patent award or utility model registration.
1.2 Foreword
Thank you for purchasing the Forlong DRT301M DIN rail three phase power quality meter with
multi-tariff function. Output is LCD displayed and the data can be transported by isolated RS485 . The
meter is provided with a non-volatile memory system that ensures that the readings are not lost or
altered when power off.
The forlong DRT301M power quality meter is the most advanced type electronic meter available at the
market. With the Forlong product range we have introduced a large scale of energy meters on the
market suitable for 110V AC to 400V AC (50 or 60Hz). Besides the normal energy meters we also
developed our own pre-paid meters with chip card, chip card re-loaders and a complete PC
management control system. For more information on other product please contact our sales
department at sale01@china_meters.com or fyl@china-meters.com.
Although we produce the Forlong DRT301M meter according to IEC 62053-21, EN50160 and our
quality inspection is very accurate there might always be a possibility that your product shows a fault
or failure for which we do apologize. Under normal conditions your product should give you years of
benefit and pleasure. In case there is a problem with the energy meter you should contact your dealer
immediately. All energy meters are sealed with a special seal. Once this seal is broken there is no
possibility to claim for warranty. Therefore NEVER open an meter or break the seal of the meter. The
warranty time is 12 months, after installation, and only valid for construction faults.
1.3 Performance criteria:
Operating humidity ≤ 75%
Storage humidity ≤ 95%
Operating temperature -10°C - +50°C
Storage temperature -30°C - +70°C
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International standard IEC 62053-21
Accuracy class
Voltage, LN & LL (Phase1,2,3) ±1%
Amps (Phase 1,2,3) ±0.5%
PF (Phase 1,2,3 &Σ) ±0.5%
Active power (Phase 1,2,3&Σ) ±1%
Reactive power (Phase 1,2,3&Σ)±1%
Apparent power (Phase 1,2,3&Σ)±1%
Frequency ±0.5%
Active energy& Demand (Σ)±1%
Protection against penetration
of dust and water IP51
Insulating encased meter of
protective class Ⅱ
1.4 Meter specifications:
Meter type DRT-301M (LCD display)
Nominal voltage (Un) 230/400V AC (3~)
Operational voltage 161/279 –300/520V AC (3~)
Insulation capabilities:
- AC voltage withstand 2KV for 1 minute
- Impulse voltage withstand 6KV –1.2µS waveform
Basic current (Ib):
CT type 1.5A
Directly connect 10A
Maximum rated current (Imax)
CT type 6A
Directly connect 100A
Operational current range 0.4% Ib- Imax
Over current withstand 30Imax for 0.01s
Operational frequency range 50Hz ±10%
Internal power consumption ≤2W / 10VA per phase
Test output flash rate (PULSE LED)
CT type 3200imp/kWh
Directly connect 400imp/kWh
Test pulse output rate (pins 8 & 9)
CT type 3200imp/kWh
Directly connect 400imp/kWh
Consumption indicator (PULSE &
SO LED) Flashing at load running
Communication indicator Flashing at communication running
Alarm indicator
Data communication port RS485 and far infrared
Data save The data can be stored more than 25 years
when power off
1.5 RS485 communication specifications:
Bus type RS485
protocol MODBUS RTU with 16 bit CRC & DL/T645
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baud rate 1200, 2400,4800,9600 (default)
19200(option)
Address range 0-255 user settable
Bus Loading 64 meters per bus
Rage 1000m
1.6 Far Infrared communication specifications:
infrared wavelengths 900- 1000nm
baud rate 1200bps(default),9600bps(option)
communication distance 5m
communication angle -15°~+15°
protocol MODBUS RTU with 16 bit CRC & DL/T645
1.7 Tariff specifications:
Tariff number 4
Time segments 10
Clock accuracy ≤0.5S (every 24 hours)
Battery Voltage 3.6V DC, ≥1.2Ah
1.8Basic errors:
With balanced loads
0.05Ib Cosφ = 1 ±1 .5%
0.1Ib Cosφ = 0.5L ±1 .5%
Cosφ = 0.8C ±1 .5%
0.1Ib - Imax Cosφ = 1 ±1 .0%
0.2Ib - Imax Cosφ = 0.5L ±1 .0%
Cosφ = 0.8C ±1 .0%
With single phase load
0.1Ib - Imax Cosφ = 1 ±2.0%
0.2Ib - Imax Cosφ = 0.5L ±2.0%
1.8Description
A Front panel
B Cover
C Base
D Security hasp
Material
Front panel PC inflammable retarding
Cover ABS inflammable retarding
Base ABS inflammable retarding
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1.9Dimensions
Height 130mm
Width 126 mm
Depth 65 mm
Weight 0.7 Kg (net)
1.10 Installation
We recommend that the connecting wire which is used to connect the meter to the outside
CAUTION
Turn off all the power before working on it.
Always use a properly rated voltage sensing device to confirm that power
is off.
WARNING
Installation should be performed by qualified personnel familiar with
applicable codes and regulations.
Use isolated tools to install the meter.
Fuse or thermal cut-off or single-pole circuit breaker can’t be fitted on the
supply line and not the neutral line.
A
B
C
D
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circuit should be sized according to local codes and regulations for the amp city of the circuit
breaker or over current device used in the circuit.
An external switch or a circuit-breaker should be installed on the inlet wire, which will be used
as a disconnection device for the meter. And there it is recommended that the switch or
circuit-breaker is near the meter so that it is more convenience for the operator. The switch or
circuit-breaker should comply with the specifications of the buildings electrical design and all
local regulations.
An external fuse or thermal cut-off which will be used as a over current protection device for
the meter must be installed on the supply side wire, and it is recommended that the over
current protection device is near the meter so that it is more convenience for the operator.
The over current protection device should comply with the specifications of the buildings
electrical design and all local regulations.
This meter can be installed indoor directly, or in a meter box which is waterproof outdoor,
subject to local codes and regulations.
To prevent tampering, secure the meter with a padlock or a similar device.
The meter has to be installed against a wall which is fire resistant.
The meter has to be installed in a good ventilated and dry place.
The meter has to be installed in a protection box when placed in dangerous or dusty
environment.
The meter can be installed and used after being tested and sealed with a letter press printing.
The meter can be installed on a 35mm DIN rail or direct on a meter board with screws.
The meter should be installed in an available height so that it is easy to read.
When the meter is installed in an area with frequent surges due to e.q. thunderstorms,
welding machines, inverters etc, protect the meter with Surge Protection Devices
After finishing installation, the meter must be sealed to prevent tampering.
Connection of the wires should be done in accordance with the underneath connection
diagram.
A、Direct connect type:
1 2 3 4
8
so
+ -
A
B
5 6 7
91112131415161718
C
N
10
485A 485B
1/2 Ia IN/OUT
3/4 Ib IN/OUT
5/6 Ic IN/OUT
7Neutral wire
8/ 9 Test pulse output contact
10/11 RS485 communication contact
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B、CT connect type
1 2 3 4
8
so
+ -
Ia
Ib
5 6 7
91112131415161718
Ic
10
Ua
Ub
Uc
N485A 485B
1/2 Ia IN/OUT
3/4 Ib IN/OUT
5/6 Ic IN/OUT
18/16/14/12 Phase A/B/C/N
8/ 9 Test pulse output contact
10/11 RS485 communication contact
1.11 Operating
Consumption indication
On the DRT-301M’S front panel, there are three LED ,respectively, for the energy meter pulse light,
communications, and fault indicator lights. The constant of the impulse is shown on the nameplate of
the meter.
Reading the meter
Electric meter in the city exist will automatically round of significant power and the rate of the
current total power timeshare. Meter with three buttons on the nameplate, respectively, programming
switches and flip up and down keys. Through the fluctuation in the scroll button to see total, sharp,
peak, flat, valley power ;last month, total, sharp, peak, flat, and valley power ;the month before
last ,total, sharp, peak, flat, valley power; demand quantity of total ,total sharp,total peak ,total
flat ,total valley in current month; demand quantity of total ,total sharp,total peak ,total flat ,total
valley in the last month ; demand quantity of total ,total sharp,total peak ,total flat ,total valley in the
month before last take place.Three-phase voltage, three-phase current, active power and phase of
total power, depending on the total phase power and apparent power, frequency, battery voltage, Date
Time, pulse constant, table, and automatic meter reading date, etc.; 20 seconds automatically after
the restoration of the current total power consumption display.
Municipal electric power will have an internal battery power supply, power meter display support.
LCD CONTECT
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DESCRIPTION OF LCD SYMBOLS DISPLAYED
Pulse output
DRT-301M DIN rail power quality meter is equipped with a pulse output which is fully separated from
the inside circuit. That generates pulses in proportion to the measured energy. They are test pulse
output (pins 8 & 9). Usually, the test pulse output is used as testing accuracy or reading purpose in
close quarters.
The test pulse output is a polarity dependant, passive transistor output requiring an external voltage
source for correct operation. For this external voltage source, the voltage (Ui) should be 5-27V DC,
and the maximum input current (Imax) should be 27mA DC. To connect the impulse output, connect
5-27V DC to connector 9 (anode), and the signal wire (S) to connector 8 (cathode). The meter pulses
is indicated on the front panel.
Symbol
Description
kW h
Unit indicator：kWh—active energy kW—active power
k var
Unit indicator ：kvar—reactive power
kvA
Unit indicator ：KVA —apparent energy
Displayed permit programming
Battery status:3.6V When the battery voltage is low, flashes show
LCD alarm indicator
Communication symbols（When communicating,it flashed ）， For 485 and
infrared communication interface in communication instructions
MD
Max demand
Tariff: T1,T2,T3,T4
this month last 1 month last 2 month
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Communication port
DRT-301M has equipped a far infrared port and a RS485 port, we can program the meter’s
operation data or reading via these 2 ports. The communication protocol conforms MODBUS RTU
protocol & DL/T645 option.
Far infrared communication port
The far infrared communication port is on the left of LCD screen. It is infrared wireless
communication port. The TP900 hand-held programmer can directly communicate the data
between the meter and this port.
The data transmission speed is 1200bps(default).
The communication distance is not less than 5m.
Rs485 output
RS485 communication port is between the meter terminal 11 and 10.
It is a synchronization wire port. Installing a software in PC, via RS485 adapter
Connecting the terminal 11 and 10, PC can communicate with the meter immediately.
1.13 Troubleshooting
CAUTION
During reparation and maintenance, do not touch the meters connecting
clamps directly with your bare hands, with metal, blank wire or other
material as you will have the chance of an electricity shock and a possible
chance for health damage.
Turn off and lock out all power supplying the energy meter and the
equipment to which it is installed before opening the protection cover to
prevent the hazard of an electric shock.
WARNING
Maintenance or reparation should be performed by qualified personnel
familiar with applicable codes and regulations.
Use insulated tools to maintain or repair the meter.
Make sure the protection cover is in place after maintenance or reparation.
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Problem
Check
Solution
No light for the
communication
indicator(COM.LED)
Is there a power
supply inside the
meter?
Does any
equipment outside
communicate with
the meter
Maybe there is a
fault in the inside
circuit.
Check that the power supply
Only when the communication
between the meter’s infrared port
Or the RS485 port and the
equipment outside, The LED will
blink
Please contact your technical
supporter to replace this meter.
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Problem
Check
Solution
No communication
Of RS485 wire data
with the meter
Is the meter ID
correct?
Is the
communication
distance too long?
Is there too many
meters connected
to RS485 main wire
Is the RS485 port
connection correct?
Is the connection
Maybe there is a
fault in the inside
circuit.
Check and use the correct the
Meter ID. After the meter finish
the production, the Meter ID
defaults to 0～67H ,69H～FFH
(Modbus protocol)
or 0000000000000～
999999999999(DL/T645
protocol) .
Shorten the communication
distance between the reading
equipment outside and the meter.
Keep sure it is not more than
1200m
The equipment to connection with
RS485 main wire is not more than
256pcs
The correct connection is: the A
signal wire of RS485 main wire to
the meter terminal 11,the B signal
wire of RS485 main wire to the
meter terminal 10
Please connect with technical
supporter to replace this meter.
No communication
of the infrared
wireless data with
the meter
Is the meter ID
correct?
Is the
communication
distance too long?
Is the
communication
protocol correct?
Maybe there is a
fault in the inside
circuit.
Check and use the correct the
Meter ID. After the meter finish
the production, the Meter ID
defaults to 0～67H ,69H～FFH
(Modbus protocol)
or 0000000000000～
999999999999(DL/T645
protocol)
Shorten the communication
distance between the reading
equipment outside and the meter.
suggest not more than 5m
Please contact the technical
support to get the meter
communication protocol
Please contact the technical
supporter to replace this meter.
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1.14 Technical support
Any questions, please contact:
TEL:
021-60975591 021-60975592
FAX:
021-60975593
Email:
Sale01@china-meters.com
www.china-meters.com
Problem
Check
Solution
The LCD energy
register can’t run.
Is the load
running ?
Is the operating
power too low ?
Maybe there is a
fault in the inside
circuit.
Only when load is running, RED
LED is burning continue, the LCD
energy register will run.
If the operating power is too low,
the spacing interval of the pulses
will take some more time. This is
why it seems like the LCD energy
register can’t run
Please contact your technical
supporter to replace this meter.
No pulse output.
Is DC power supply
connected to the
meter ?
Is the connecting
correct ?
Maybe there is a
fault in the inside
circuit.
Check the external voltage source
(Ui) is 5-27V DC.
Check correct connecting:
Connect 5-27V DC to connector 3
(anode), and the signal wire (S)
to connector 2 (cathode).
Please contact your technical
supporter to replace this meter.
Pulse output rate
wrong.
Maybe there is a
fault in the inside
circuit.
Please connect with technical
supporter to replace this meter.
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