Multitek MultiLed M812-LD Series User manual

MULTILED
M812-LD*
OPERATING MANUAL
multitek
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2
CONTENTS
1. INTRODUCTION
2. OPERATION
3. SCREEN DISPLAYS
4. PROGRAMMING PARAMETERS
5. RS485 COMMUNICATION
6. INSTALLATION
7. CONNECTION DIAGRAMS
8. SPECIFICATION
Revision 4
Date 21-10-2011
Multitek Ltd.
Lancaster Way, Earls Colne Business Park, Earls Colne,
Colchester, Essex. U.K.
Tel [phone] Fax [phone]
Email : [e-mail]
www.multitek-ltd.com

Version 4 update:
Page 53: Changed 3X Modbus registers to odd numbers.
Page 57: Changed 4X Modbus registers to odd numbers.

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1.1 General
The MultiLed M812-LD* is a compact 96 x 96 mm Din case 3
phase power meter, with the ability to measure Volts, Amps,
Frequency, Active Power, Reactive Power, Apparent Power, Active
Energy, Reactive Energy, Power Factor, Average Demand Amps,
Active Power Apparent Power, Maximum Demand Amps, Active
Power and Apparent Power
Power Systems :- Single Phase, Single Phase 3 wire, 3 Phase 3
wire unbalanced load & 3 Phase 4 wire unbalanced load.
1.2 Memory
All data including energy registers, current and voltage ratios and the
calibration data is stored in a non volatile e2prom memory. The
e2prom requires no battery or other circuitry to maintain the stored
data.
The MultiLed is designed to be user friendly and simple to use. All
operations are controlled by the two push buttons & on the
front of the M812-LD*
All necessary programming is also carried out via the front two
control buttons.
Each phase current and voltage is measured continuously and all
other parameters are derived from these measurements in the
software. Voltage and current measurements are true RMS.
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1.3 Relay Output
The option of a relay is provide on M812 models. The relay
output provides a pulse output corresponding to either Watt hour
or VAr hour consumption. (see programming section 4.3.1).
The MultiLed automatically calculates the pulse rate and whether
the units are W.h, kW.h or MW.h (VAr.h, kVAr.h or MVAr.h) from
the nominal voltage and current inputs.
The relay is a normally open contact. Every time the MultiLed
registers a Watt hour or VAr hour reading the relay closes.
Pulse widths can be programmed into the MultiLed, between 20
msec and 200 msec in steps of 20 msec. (see section 4.3.3).
1.4 Communications
The MultiLed has the option of providing RS485 or output of all
measured parameters.
The RS485 enables reading and programming of the MultiLed via
a host computer. The RS485 uses the Modbus protocol allowing
multi-drop with up to 32 MultiLed's connected in parallel. The
RS485 modbus protocol allows the MultiLed to be used with PC,
PLC, RTU, Data loggers and Scada programs.
The RS232 allows the MultiLed to be connected to a standard
serial communication port, for example on a host computer, data
logger, PLC etc.
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2.0 MultiLed Models
M812-LD* measures and displays phase and line volts, phase
amps, frequency, active power, apparent power, reactive power,
active energy, reactive energy, power factor, average demand for
amps active power and apparent power, maximum demand for
amps, active power and apparent power and option of neutral
current.
Product codes Power System
M812-LD1 Single phase
M812-LD1-3 1 phase 3 wire unbalanced load
M812-LD4 3 phase 3 wire unbalanced load
M812-LD9 3 phase 4 wire unbalanced load
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3. DISPLAY SCREENS
3.1 . The sequence of the parameters displayed are dependant on
the model and the wiring system that MultiLed is programmed for.
3.1.1 The following screens appear on M812-LD9 3 phase 4 wire
unbalanced load :-
ACTION :
Switch on power
COMMENTS :
The MultiLed is programmed to 3 phase
4 wire unbalanced load. The first
screen shows 3 phase line to neutral
voltage.
ACTION :
Press
6
COMMENTS :
The second screen shows 3 phase line to
line voltage
L1/L2, L2/L3, L3/L1. If the button is
pressed the MultiLed goes back to the
previous screen.
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ACTION :
Press
COMMENTS :
The third screen shows 3 phase current
L1, L2, L3. If the button is pressed
the MultiLed goes back to the previous
screen.
ACTION :
Press
COMMENTS :
The fourth screen shows total Watt, VAr
and VA of the 3 phase system. Note for
Watt & VAr if either parameter is Export
the corresponding export annunciator
LED is illuminated.
7
ACTION :
Press
COMMENTS :
The fifth screen is an option and shows
the neutral current. The MultiLed
calculates and displays the current
flowing in the neutral lead.
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ACTION :
Press
COMMENTS : If the option of neutral
current is not ordered the fifth screen
shows system Power Factor and Hz.
Note minus sign and export annunciator
indicate which quadrant the power and
PF are in. See section 3.3.3.
8
ACTION :
Press
COMMENTS :
The seventh screen displays Reactive
Energy (VAr.h kVAr.h MVar.h depending
on CT and VT ratios)
ACTION :
Press
COMMENTS :
The sixth screen displays Active Energy
(W.h or kW.h or MW.h depending on CT
and VT ratios) Note max 6 digits are
used, in this example reading is 354999
kW.h
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9
ACTION :
Press
COMMENTS :
The eighth screen shows the Average
Demand for Watts, Amps and VA, of the
system being measured.
ACTION :
Press
COMMENTS :
The ninth screen shows the Maximum
Demand (Peak Demand) for Watts,
Amps and VA, of the system being
measured.
ACTION :
Press
COMMENTS : The tenth screen shows
harmonic distortion of each phase
voltage.
9.0
8.0
10.0
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