EM720 POWER QUALITY AND REVENUE METER Installation Manual BG0450 Rev.
LIMITED WARRANTY The manufacturer offers the customer a 24-month functional warranty on the instrument for faulty workmanship or parts from date of dispatch from the distributor. In all cases, this warranty is valid for 36 months from the date of production. This warranty is on a return to factory basis. The manufacturer does not accept liability for any damage caused by instrument malfunction.
Table of Contents Chapter 1 Introduction............................................................................................ 1 About This Manual.......................................................................................................... 1 About The EM720........................................................................................................... 1 Chapter 2 Installation .............................................................................................
FIGURES Figure 1: Dimensions..........................................................................................................................3 Figure 2: Wall mount dimensions........................................................................................................4 Figure 3: Memory Backup Lithium Battery and Battery Pack Installation ............................................5 Figure 4: EM720 Connectors view ...........................................................................
Chapter 1 Introduction About This Manual This manual is intended to assist the user in the installation of the eXpertmeter™ EM720 POWER QUALITY REVENUE METER Unit. The term ‘EM720’’ is used herein to refer to all models in the series. This chapter gives an overview of this manual and an introduction to the EM720. Chapter 2, Installation, provides instructions for mechanical and electrical installation.
AC/DC Inputs • • • • Three AC voltage inputs - up to 480VAC direct line-to-line input voltage, for feeding and measurement Three isolated AC voltage inputs - up to 2KV peak direct line-to-ground and neutral-to-ground input voltage Four standard isolated AC current inputs - 5A nominal input currents and up to 50 A fault overload current Optional isolated low DC power supply input – up to 4KV AC insulation withstanding I n p u t / O u t p ut s O p t i o n s The EM720 is equipped with four fast digital input
Chapter 2 Installation 1. Installation Mechanical Installation Refer to the figures provided in this section to properly perform the mechanical installation.
F i g u r e 2 : W a l l m o u n t d im e n s i o n s 4 Chapter 2 Installation
Electrical Installation Before installing, ensure that all incoming power sources are shut OFF. Failure to observe this practice can result in serious or even fatal injury and damage to equipment.
Voltage Inputs There are 3 AC Y-connected voltage inputs of 480V (phase-to-phase) and neutral, via Main Terminal Block. Copper wiring 2.5 – 6 mm2 (10 AWG) should be used. The EM720 Power Supply Inputs are the same as the Voltages Inputs Current Inputs There are 4 current inputs up to 50A, connected to external CT’s via Main Terminal Block. Copper wiring 2.5 – 6 mm2 (10 AWG) should be used.
Typical Installation Figure 5: Typical Electrical Installation Chapter 2 Installation 7
Wiring Configurations There are seven wiring configurations shown in Figures 6, 7, 8, 9, 10, 11, 12 or 13; Wiring Configuration Wiring Setup See Figure: 3-wire 2-element direct connection using 2 CTs 4-wire WYE 3-element using 3 (4) CTs 4-wire WYE 3-element connection using 3 PTs, 3 CTs 3-wire 2-element open delta connection using 2 PTs, 2 CTs 4-wire WYE 2½-element connection using 2 PTs, 3 CTs 3-wire 2½-element open delta connection using 2 PTs, 3 CTs 4-wire 3-element delta using 3 CTs 3dir2 4Ln3 or 4L
F i g u r e 7 : F ou r W ir e W Y E C o n n e c t i on U s i n g 3 ( 4 ) C T s - W i r i n g S e t u p : 4 L L 3 o r 4 L n 3 F i g u r e 8 : F ou r W ir e W Y E C o n n e c t i on U s i n g 3 P T s , 3 ( 4) CT s - W i r i n g S e t u p : 4 L L 3 o r 4 L n 3 Chapter 2 Installation 9
F i g u r e 9 : T hr e e W i r e O pe n D e l t a C on n e c t i o n U s i n g 2 P T s , 2 C T s - W i r i n g S e t u p : 3 O P 2 F i g u r e 1 0 : T h r e e W i r e W y e C o n n e c t io n U s i n g 2 P T s , 3 CT s - W ir i n g S et u p : 3 L L 3 o r 3 L n 3 Energy is measured with 2 CTs only – Phases 1(A) and 3(C) 10 Chapter 2 Installation
F i g u r e 1 1 : T h r e e W i r e O p e n D e l t a Co n n e c t i o n Us i n g 2 P T s , 3 C T s - W i r in g S e t u p : 3O P 3 Energy is measured with 2 CTs only – Phases 1(A) and 3(C) F i g u r e 1 2 : F o u r W i r e D el t a C o n n e c t io n U s i n g 3 C T s - W i r i ng S e t u p : 4 L L 3 o r 4 Ln 3 Chapter 2 Installation 11
Input / Output ports options O n bo ar d Di gi t al I nput s The EM720 is equipped with four fast Dry contact detector – Digital Inputs 4DI unit.
D ig it a l I n pu t s /D ig ita l O u tp u ts ( 2D I / 2D O – op t io n a l mod u le) The 2D/2DO module consists of two status inputs and two FORM C relays outputs. The 2D/2DO module can be plugged-in any EM720 module slots Two optically isolated digital inputs are provided for status monitoring dry contacts that may be connected to these inputs by a four pin detachable terminal block and two Change Over Relay Contacts are provided to a separate six pin detachable terminal block, as shown in Figures 14.
Communications options The EM720 has numerous communication possibilities depending on your ordering preferences. All communications ports, of different type, can be used simultaneously. The EM720 is equipped with one standard optical communication (COM) port. Other COM ports are available as optional module.
5. 6. After one minute the "LNK" GREEN LED is flashing until it lights "ON" continuously The "RSSI" ORANGE LED will light "ON" or blinks, the flashing rate is proportional to the RF receive level (RSSI), if RF receive level is high then the led is "ON" continuously, if RF receive level is poor then the led is blinking R S- 48 5 /232 C o mm un ic a t ion por t ( C OM 3 – op t io n a l mod u le) The RS-485/232 Communication port – COM3 is provided by optional modules: IRIG-B and ETH/USB modules.
F i g u r e 1 8 : S e r i a l C o m m u n i c a t i o n C o n n e c t i o n – R S - 2 3 2 CO M 3 E T H E R N ET / U S B C om m un ic a t io n po r t ( ETH /U S B – o pt io na l m odu le ) The ETH/USB module provides a standard 10/100 BT Ethernet and full speed mini-USB device ports, terminated with RJ45 connector for ETHERNET and mini-USB type B connector for Laptop USB port, as shown in figure 18 and figure 19, respectively. The ETH/USB module can only be plugged-in the EM720 module slots 1 and 2.
F i g u r e 2 0 : M i n i - U S B de v i c e C o n n e c t i o n To prevent potential differences between the Personal Computer (PC) USB port and the EM720 USB device port, it is recommended to use a galvanic isolated USB adaptor before connecting the EM720 USB port to a Personal Computer (PC), or to use battery powered PC.
Auxiliary Power Supply L ow D C A ux i lia r y Po w e r Sup p ly The EM720 can be equipped with additional power supply to redundant the built-in power supply (Auxiliary Power Supply – APS), without need of Battery backup Power Supply (BPS). The DC APS can be plugged-in any EM720 module slots.
Location of Modules The 3 slots expand the EM720 with additional input/output ports (future module), communication modules and Auxiliary DC Power Supply module. The following functions are available in the following slots: • • • • • • • IRIG-B – any slot COM2 (Dial up or Cellular modem port) - slot 3 only COM3 - any slot Ethernet – any slots USB – slots 1 and 2 I/O (future) – any slot AUX.
Chapter 3 Communications 2.
Chapter 4 Replacing the Battery When the battery level drops below the minimum allowed threshold, the LCD graphic display, on the , indicating that the battery should be replaced. Use the following front of the device, shows: procedure: 1.
Appendix: Technical Specifications Inputs Ratings AC Voltage inputs V1, V2, V3, VN and VG Reference voltage Un 57.73V up to 120V L-N (via PT) Voltage rating: 3 x 57.73/100 V 3 x 63/110 V 3 x 69/120 V 3 x 57.
AC Current inputs 4 Galvanic isolated Inputs Reference Current Basic model In = 5A Option model In = 1A Overload current (continuously) Imax Maximum measurable short circuit current (Isc) Burden per phase (In = 5 A) Burden per phase (In =1 A) Starting current (I1, I2, I3) Starting current (I4) Over current withstand for 1 second non-recurring Voltage galvanic isolation rating Terminals for wires size Appendix: Technical Specifications 2 x In 10 x In < 0.2 VA < 0.05 VA 0.1% In 0.5% In 50 x In 4000V r.m.
Power Supply 3P power supply (MPS) 207-480V AC 50/60 Hz 100-120 V AC 50/60 Hz Battery backup Power Supply (BPS) AUX. Power Supply (APS) DC PS module Optional Real Time Clock Battery backup Power Supply Inputs from measured AC Voltage inputs High range power supply (480V option) Low range power supply (120V option) 96- 575V AC 45 - 250 V AC Burden as per IEC 62053-61 multi-function meter requirements 3 W and <15VA/phase Build-in rechargeable NiMh battery, Redundant MPS 2.
Communication ports COM1 IR - Basic COM2 GSM/GPRS module – Optional Front panel Optical Communication port IEC 62056-21 Max. Baud rate Protocols 19.200 kb/s Modbus RTU/ASCII and DNP3.0 Field installable Quad Band GPRS class10 115.2 kb/s Modbus RTU/TCP and DNP3.0/TCP 4 KVAC @ 1mn SMA Plug-in modules isolated communication port GSM/GPRS module Max.
Console Display Unit Display LEDs SCROLL SELECT/ENT ER buttons IR port LCD graphic bright display Resolution Multiple screens display 128 x 32 dots Viewing area Operational temperature Backlit LCD display screen 99.0 x 24.0 mm -20°C to + 70°C Timeout operation Active and reactive energy led pulses 2 Monitoring and configuring Sealed buttons 2 Infra red communication port COM1 Real Time Clock 2.
Standards Compliance EMC Immunity IEC standards ESD - IEC61000-4-2/IEC 62052-11 15KV/– air/contact Electromagnetic RF Fields - IEC61000-4-3/IEC 62052-11 FTB - IEC61000-4-4/IEC 62052-11 30V/m @ 80Mhz – 1000MHz 4KV on current and voltage circuits and 2 KV for auxiliary circuits 4KV on current and voltage circuits and 1 KV for auxiliary circuits 10V @ 0.
Measurement Specifications Parameter Full Scale @ Input Range % Reading Voltage V1-V3 (L-n) 230 x PT ratio @ 230V Voltage V4 (calculated) 230 x PT ratio @ 230V Voltage V1-V3 (L-n) 69 x PT ratio Voltage V4 (calculated) 69 x PT ratio 0.05 0.1 Accuracy % FS Conditions ±0.05 1% up to 140% ±0.5 5% up to 140% ±0.05 1% up to 140% ±0.5 5% up to 140% Range 0 up to 999,000 V 0 up to 999,000 V Line current I1- I4 CT primary current ±0.06 ±0.
