LARSEN & TOUBRO LIMITED, MYSORE WORKS ER300P-PRIDE User manual

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Electronic Trivector Meter
ER300P-PRIDE
Class 0.2S
For
Neyveli Lignite Corporation
LARSEN & TOUBRO LIMITED, MYSORE WORKS

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2.1 Theory of Operation
2.1.1 Analog section
2.1.2 Digital processing section
2.1.3 Power supply section
2.2 Hardware
2.2.1 Compact
2.2.2 Efficient
2.2.3 Ruggedness and Safety
2.2.4 Features
2.2.5 Data Safety
2.3 Software
2.3.1 Definitions
2.3.2 Load survey records
2.3.3 Instantaneous Parameters.
2.3.4 Programmable features
2.3.4.1 External CT/PT ratios
2.3.4.2 RTC Setting
2.3.4.3 Communicating Parameter setting
2.3.4.4 Factory Configurable
2.3.4.5 Accuracy Method
2.3.5 Display Details
2.3.6 Communication
2.3.7 Internal Battery Option

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4. APPENDIX A
Fig 1. Parts/Dimensions
Fig 2 3 Ph 4W connection diagram - with CT
Fig 3 3 Ph 4W connection diagram - with CT & PT
Fig 4 RS 485 connection diagram (top view)
Fig 5 RS 485 connection diagram (front view)
5. APPENDIX B - Technical specifications
6. APPENDIX C - MODBUS details and memory map
7. APPENDIX D – List of errors

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failure and CT open are also indicated instantaneously.
• 15 minutes Load Survey recorders for 40 days
1. Forward Wh
2. Reverse Wh
3. Forward VArh
4. Reverse VArh
and Tampers are recorded.
• Meter configuration/data collection possible through
- RS485 port using MODBUS protocol.
- Optically isolated serial interface using DCD.
• kWh & kVArh pulse output LEDs available on front
panel.
• LCD Segments for indicating presence of voltages in
each phase separately is available.
• LCD, with back lighting and of extended temperature, to
display various parameters.
• Keys on the front panel to scroll through display
parameters.
• Rugged polycarbonate casing makes it a good insulator
and so no external "EARTHING TERMINAL” is required.
• Built in self-supervision.

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High precision current transformers and voltage transducers
step down input currents and voltages, that are fed to an
Analog to Digital converter
2.1.2. DIGITAL PROCESSING SECTION
A powerful microprocessor controls the analog and digital
sections. The digital samples are processed to obtain various
metering data that is stored in non-volatile memory. A high
precision real time clock controls all time keeping activities.
External interface is through Display, Keyboard, RS485
Communication port and Optical Communication port.
2.1.3. POWER SUPPLY SECTION
A switched mode power supply supplies power to the meter’s
internal circuitry.
2.2 HARDWARE
The hardware of the meter has been designed to make it light
in weight, rugged, reliable and safe for the users.
2.2.1. Compact
The meter is designed using Surface Mount Technology, which
makes it light in weight and compact.

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meters that use LED displays.
2.2.3. Ruggedness and safety
All components used in the meter are of extended
temperature range, which makes the meter ideal for tropical
climates.
The meter’s top and bottom covers are made of polycarbonate,
which is a good insulator. The meter is safe for the user.
The meter’s casing and terminal block have been made of non-
flammable plastic material.
2.2.4. Features
• LEDs - LEDs for Wh & VArh. PULSE outputs are
available on front panel.
• Keys - In closed condition, two keys are provided on
the front panel, for scrolling through the display.
• LCD - The meter uses an extended temperature LCD,
with back lighting, which displays various parameters.
• RS485 port – for communication using MODBUS
protocol
• Optical port – for serial communication.
2.2.5. Data safety

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RTC with battery backup is used for time keeping. It
has a calendar of 100years.
• Watch dog timer is used to monitor the processing
activities that ensures the reliable operation of the
meter.
• Power down sensor senses power failure and shuts
down the system safely.
• Data security lock is provided for storing metering
data. This makes the metering data immune to
spurious signals on power lines.
• The meter is designed to conform to IEC standards for
EMI/EMC, which makes the system immune to
Electromagnetic Interference.
• Periodic setup/program data check is carried out
and anomaly is indicated on error occurrence.

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Method of energy computation:
All energies are of fundamental component only.
Following method is adopted for forward/reverse energy
calculations -
Forward Wh: (W1 + W2)
Reverse Wh: (W3 + W4)
Forward VArh: (R1 + R4)
Reverse VArh: (R2 + R3)
Where W1, W2, W3 & W4 are the absolute active energies & R1,
R2, R3 & R4 are the absolute reactive energies in the four
quadrants.
Note: All energies are of fundamental component only.
0
W2 W1
R2 R1
270 90
W3 W4
R3 R4
180
• Average freq. –

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minutes time blocks will be contracted by ten seconds each.
• Retard RTC command:
When Retard RTC command is given, six consequent 15
minutes time blocks shall be elongated by ten seconds each.
2.3.2. LOAD SURVEY RECORDERS
All energies, voltages and currents are of fundamental component
only.
Load survey data at 15 minutes interval for 40days:
1. Forward Wh
2. Reverse Wh
3. Forward VArh
4. Reverse VArh
5. Average frequency
6. Average of 3 phase voltages
7. Tamper details
Resolution (without CT and PT ratios)
Energy: 2 decimals (xxx.xx Wh/VArh)
Frequency: 3 decimals (xx.xxx Hz)
Voltage: 2 decimals (xxx.xx V)
Tamper details:
Voltage failure, CT open, CT or PT setting tampered, Meter
malfunction, Power fail, Advance command, Retard
command and RTC set command details are available.

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b Phase voltages.
c> Phase currents.
d> Active Power.
e> Reactive Power.
f> Apparent Power.
g> Total Power Factor.
h> Average Frequency.
i> Tamper Status.
Format: Bit nos.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
x x x x x x x x s r a x e t c v
where
v = voltage failure (immediate status)
c = CT open (immediate status)
t = CT or PT setting done (of running 15 mins block)
e = Meter mal-function (of running 15 mins block)
a = advance RTC (of running 15 mins block)
r = retard RTC (of running 15 mins block)
s = RTC set (of running 15 mins block)
x = don’t care
(bit is set if event occurred)
j> Time.
k> Cumulative Energies.
l> Anomaly string
2.3.4 PROGRAMMABLE FEATURES
All the below given features are programmable through RS485
port & DCD
2.3.4.1. EXTERNAL CT/PT RATIOS
The meter can be programmed for external CT/PT ratios.

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2.3.4.2. RTC SETTING
RTC setting
For RS485, PC software can have password protection.
Password protection on meter for DCD.
No hardware protection.
a>SYNC RTC time setting (absolute RTC command)
b> Advance RTC command
Contracts six consecutive 15 minutes. Time blocks by
10secs each.
c> Retard RTC command
Expands six consecutive 15 minutes. time blocks by
10secs each.
Between advance/retard command there will be a lockout period of
7 days. If power fails before completion of all time blocks of
advance/retard command, then on power on, the balance correction
will be done in the following 15 minutes time blocks. Pending
advance/retard commands are aborted by sync RTC command.
2.3.4.3 COMMUNICATING PARAMETERS SETTING
Meter ID, baud and parity settings used by MODBUS
communication only, can be changed through DCD, with password
protection.
(Default setting of MODBUS: Meter ID =01, baud = 9600, parity =
none)
DCD to meter optical head, communication parameters are fixed –
i.e. 4800 baud, even parity, 7bit, 1start bit and 1 stop bit.

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Each meter is given a unique number at factory.
2.3.4.5. ACCURACY METHODS:
• Pulse method - PULSES/Wh: 10 for 5A meter
50 for 1A meter
PULSES/VArh: 10 for 5A meter
50 for 1A meter
• Accuracy check using DCD (MRI) -
Energies are in Watt-hours.
2.3.5. DISPLAY DETAILS
• LCD-The parameters calculated by the meter are displayed
on a LCD with back Lighting.
• Scroll rate - The scroll rate of the display parameters in
the Auto scroll mode is 3 seconds.
• Display modes-
a>Manual scrolling – Manual scrolling within a display
mode is possible by using UP or DOWN keys.
b>Auto scrolling – The display on the meter changes as
per the sequence given at scroll rate.
• Mode Switching – Switching between Manual and Auto
Scrolling Mode is possible by simultaneously pressing the
UP and DOWN keys.

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iii.kW “ xx.xxxx ”
“Pr kW ”
iv.kVAr “ xx.xxxx ”
“Pr kVAr ”
v.kVA “ xx.xxxx ”
“Pr kVA ”
vi.R phase Line voltage “ xxx.xx ”
“L1 V ”
vii.Y phase Line voltage “ xxx.xx ”
“L2 V”
viii.B phase Line voltage “ xxx.xx ”
“L3 V”
ix.R Phase voltage “ xxx.xx ”
“U1 V”
x.Y Phase voltage “ xxx.xx ”
“U2 V”
xi.B Phase voltage “ xxx.xx ”
“U3 V”
xii.R Phase currents “ xx.xxx ”
“A1 A”
xiii.Y Phase currents “ xx.xxx ”
“A2 A”
xiv.B Phase currents “ xx.xxx ”
“A3 A”
xv.Power factor “ PF x.xxx ”
“Pr ”
xvi.Frequency “ xx.xxxx Hz ”
(of running 15mins block)

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CkVArh
xx.Cumulative reverse “-- ←”
kVArh “ xxx.xxxx ”
“C kVArh”
xxi.Final reading of forward Wh (00:00hr reading
of present day) “ →+ ”
“ xxxx.xxxx ”
“P1 kWh”
xxii.Initial reading of forward Wh (00:00hr reading
of previous day) “→+ ”
“ xxxx.xxxx ”
“P2 kWh”
xxiii.Final reading of reverse Wh (00:00hr reading
of present day) “-- ←”
“ xxxx.xxxx ”
“P1 kWh ”
xxiv.Initial reading of reverse Wh (00:00hr reading
of previous day) “-- ←”
“ xxxx.xxxx ”
“P2 kWh”
xxv.Serial no. “NLC01 ”
Cumulative Energy and Power format on display
CT ratio * PT ratio Energy Power

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2.3.5 COMMUNICATION
• RS485 port with MODBUS Protocol. From this port Data
(Load survey and instantaneous) can be collected, and
Parameters can be configured.
Refer to Annexure C for details.
• Optically Isolated serial interface port confirming to
IEC 1107 Protocol. Through this port, Parameter
setting/ Data collection (Only Load survey) is possible.
2.3.7 INTERNAL BATTERY OPTION
In absence of power, the meter can be operated using the
battery (NiCd) for viewing the display, collecting data.

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3.2 Re-packing
If the meter has to be returned to the supplier, repack the unit
in the packing in which it was supplied.
3.3 Optimum Field Conditions
For the reliability and better life of the product the unit has to be
operated at moderate temperatures and humidity. The meter is
designed to work from -5 to 60 deg C and humidity of 95% RH
non-condensing.
3.4 Storage
In case if the meter is not installed after receiving, it has to be
stored in a dry place in the original packing material.
3.5 Mounting
The meter can be fixed on any flat, even surface or on a
standard metering panel on three points, one on top used for
hanging the meter and the other two at the bottom used to
mount the meter.
3.6 Extra precautions

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Hence it DOES NOT HAVE ANY EARTH TERMINAL .
For the WIRING connections the terminal block has been
provided with 8 terminals.
The WIRING connections are to be done as shown in the
Appendix A.
Terminal cover is to be used to protect the meter terminals from
being tampered with. As soon as the connections are made the
terminal block has to be covered and sealed by terminal cover.
It can be fixed using two screws.

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kVArH
MYSORE, INDIA
LARSEN & TOUBRO LI MITED,
Manufactured by
RYB
Sl.No.
BATT RST
Pulse Rate
Freq.
Vo l t
kWH
Propert y of
Class 0.5
3phase
AV Cur r
MF
/Unit
50Hz
wire system3

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3PHASE 4 WIRE
WIRE CONNECTION DIAGRAM WITH CT
Fig. 2
R
Y
B
aaaa
bbb
BBB
AAA
3PHASE 4 WIRE
WIRE CONNECTION DIAGRAM WITH CT & PT
R
Y
B
N
k l
K L
k l
K L
k l
K L

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RS 485 connection diagram (Top View)
Fig 4
RS 485 connection diagram (Front View)
Fig 5
Screws
Tx -
Tx +
Gnd
1 2 3 4 5