L90. Multilin LINE CURRENT DIFFERENTIAL SYSTEM. Phase segregated line current differential and distance protection KEY BENEFITS APPLICATIONS FEATURES

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1 Multilin L90 LNE CURRENT DFFERENTAL SYSTEM Phase segregated line current differential and distance protection KEY BENEFTS Phase segregated differential protection ensures secure high-speed single pole tripping Complete EC 850 Process Bus solution providing resource optimization and minimizing total P&C life cycle costs Reliable and secure protection on lines equipped with series compensation ncreased sensitivity through dynamic charging current compensation and communication channel asymmetry compensation APPLCATONS Overhead lines including series compensated lines and underground cables of different voltage levels Circuits with tapped transformer feeders Suitable for three terminal line configurations, with channel redundancy and direct transfer tripping (DTT) Advanced fault and disturbance recording, including internal relay operating signals thus eliminating the need for external recording devices Phasor Measurement Unit - Synchronized phasor information according to EEEC37.8 standard Robust network security enabling Critical nfrastructure Protection through user command logging, and dual permission access control Ambient temperature monitoring with alarming when outside temperature exceeds upper thresholds Wide area system monitoring and control and using integrated protection and synchrophasor measurement Single and dual-breaker circuits requiring single pole/threepole autoreclosing and independent synchrocheck supervision Distributed busbar protection FEATURES Protection and Control Phase segregated line current differential with adaptive restraint & Ground differential, stub bus protection Thermal protection, under /over frequency, broken conductor Phase Distance (three Zones) with independent compensation settings for in-zone power transformers Ground distance (three zones) with independent self and mutual zero sequence compensation, reverse power Reverse power, Out of Step tripping and power swing blocking Thermal overload, phase, neutral and negative sequence directional overcurrent; and broken conductor Over, Under and rate of change of Frecuency, Synchronism check for dual breaker applications Communications Networking interfaces 00Mbit Fiber Optic Ethernet, RS485, RS232, RS422, G.703, C37.94 Multiple Protocols - EC850, DNP 3.0 Level 2, Modbus RTU, Modbus TCP/P, EC , Ethernet Global Data (EGD) Direct /O secure, high-speed exchange of data between L90s for Direct Transfer Trip applications Embedded Managed Ethernet Switch with 4-00 Mbit Fiber optic ports and 2 copper ports g Digital Energy EC 850 Process Bus nterface Robust communications with up to 8 HardFiber Bricks Seamless integration with existing L90 functions Redundant architecture for dependability and security Monitoring and Metering Real time monitoring of remote, local and differential per phase currents Oscillography - 4 samples/cycle, up to 4 records Event Recorder time tagged events, with 0.5ms scan of digital inputs Data Logger - Up to channels with user selectable sampling rate Synchronised measurement of voltage & current and sequence component phasors - to 0 phasors/sec Multi-ended fault location consistently providing 2% accuracy Enerista Software Graphical Logic Designer and Logic Monitor to simplify designing and testing procedures Document and software archiving toolset to ensure reference material and device utilities are up-to-date Enerista ntegrator providing easy integration of data in the L90 into new or existing monitoring and control systems 20

2 Protection and Control The L90 is a high-end cost effective line current differential protection relay intended for transmission lines and cables of different voltages levels providing reliable and secure operation even under the worst case power system conditions. The L90 provides high-speed phasesegregated fault clearance suitable for single and three-pole tripping applications. Part of the Universal Relay family, the L90 comes with a variety of versatile features truly integrating protection, monitoring, metering, communication and control in one easy-to-use device. The Universal Relay family offers a high degree of modularity in its design and functionality providing superior performance in protection and control meeting the toughest requirements of the marketplace. L90 - Protection, Metering, Monitoring and Control The L90 is the single point for protection, control, metering, and monitoring in one integrated device that can easily be connected directly into DCS or SCADA monitoring and control systems like iewpoint Monitoring as shown. Segregated Current Differential Protection The L90 is a phase segregated current differential protection relay, which uses superior and patented algorithms to address the challenges of bandwidth, security, dependability and sensitivity in current differential relaying. Bandwidth requirements are effectively addressed by means of a patented new data consolidation technique called phaselets. This permits application within a communications bandwidth of 4 Kbps, and can detect faults within a half cycle plus channel delay. The L90 innovative dual slope adaptive restraint characteristic, based on estimates of measurement errors, allow the relay to be secure on severe external faults while maintaining sensitivity for internal faults. The estimate of errors in the input currents permits more sensitive settings than those used in the traditional percent differential schemes. The L90 approach to clock synchronization relies upon precise distributed synchronization. Clocks are phase synchronized to each other and frequency synchronized to the power system frequency. Each relay compares its clock to the phase of the other clocks and makes appropriate adjustments. This allows for greater transient ride-through for power system and communications disturbances. Enhanced additional security is provided by a sensitive current disturbance detector, which can be used to supervise the current differential element. Functional Block Diagram Monitoring CLOSE TRP 50DD 50P 50_2 5P 5_2 50BF 87L 2P 7P 8 78 Data From/To Remote End (via Dedicated Communications) L90 Line Differential System G FlexElement TM 5G Metering 50N 5N Transducer nputs 59X 27X 8U/O 7N/G 2G 59P 27P 59N AS.CDR ANS Device Numbers & Functions Device Number Function 2G Ground Distance 2P Phase Distance 25 Synchronism Check 27P Phase Undervoltage 27X Auxiliary Undervoltage 32 Sensitive Reverse Power 49 Thermal Overload 50BF Breaker Failure 50DD Current Disturbance Detector 50G Ground nstantaneous Overcurrent 50N Neutral nstantaneous Overcurrent 50P Phase nstantaneous Overcurrent 50_2 Negative Sequence nstantaneous Overcurrent 5G Ground Time Overcurrent 5N Neutral Time Overcurrent 5P Phase Time Overcurrent 5_2 Negative Sequence Time Overcurrent 52 AC Circuit Breaker 59N Neutral Overvoltage 59P Phase Overvoltage 59X Auxiliary Overvoltage 7_2 Negative Sequence Directional Overcurrent 7N Neutral Directional Overcurrent 7P Phase Directional Overcurrent 8 Power Swing Blocking 78 Out-of-step Tripping 79 Automatic Recloser 8U/O Under /Over Frequency, df/dt 87L Segregated Line Current Differential 202

3 Ground Differential 87G The Ground Differential function 87G protects against low-current single lineto-ground faults. t has a single slope characteristic and uses the vectorial sum of all in-zone phase currents to calculate the Neutral differential current. with the maximum value of phase current being used as restraint. This function together with the phase differential delivers enhanced sensibility and selectivity to the protection scheme. Charging Current Compensation For long transmission lines and underground cables, the charging current may be large and result in excessively high pickup settings. The L90 can dynamically compensate the charging current thus increasing its sensitivity to the fault current on long transmission lines. Enhanced Monitoring Features The L90 uses an advanced error detection and supervising functions to secure the L90 against misoperation due to erroneous data. High bit errors are addressed by means of computing a 32 bit CRC check sums effectively addressing the concerns of multiple bit errors due to high channel noise. On multiplexed channels, channel asymmetry may be expected due to path switching spurious differential currents, which can endanger the security of the differential system. By using GPS time synchronization, up to 0ms of channel asymmetry can be compensated for. Extra security has been implemented in the L90 to ensure proper operation on the event of RG-B signal failure. ntegrated channel monitoring provides real-time diagnostic data on the health of the L90. Communications channel deterioration or failure will activate an alarm, and can be used to enable backup protection. Channel propagation delay is monitored and adjusted according to variations in communication paths. link, acting either as master collecting data, making calculations and making all relevant trip and restraint decisions, or as slave only transmitting current data to the one acting as master. For two terminal applications, use the redundant communications capability of the L90 for optimal reliability of the current differential line protection. For this scheme, data is continuously transmitted over both channels, so if a failure occurs, the L90 will continue to provide current differential protection. For three terminal applications, advanced inter-relay communication features eliminate the need for redundant communication channels due to the ability of the L90 to automatically switch between master and slave mode, maintaining a dependable system even with a failure of one of the communication channels. Distance Separate high-speed phase and ground distance elements are provided for optional supervision with tapped transformers and as a back-up during channel failures or unavailability. The back-up distance the Typical Applications functions in L90 come with three zones of phase and ground distance (mho or quad). The phase distance elements come with built-in in-zone transformer compensation. The L90 also provides a load encroachment element, which supervises the distance elements under heavy line loading conditions. Overvoltage and undervoltage protection Long lines under lightly loaded conditions or no-load may experience voltages exceeding rated per unit voltage level of the line. Use the phase overvoltage element of the L90 to initiate a local trip as well as a remote trip using direct transfer trip. Overcurrent Functions TThe L90 provides thermal overload, time and instantaneous overcurrent elements for phase, neutral, ground, negative sequence, phase and neutral directional. Any of them can run in parallel with primary differential protection or can be programmed to run when the differential element is not available. Communication Topologies Relays can communicate through direct fiber, RS422, G.703, EEE C37.94 interfaces at 4Kbps, with extensive channel monitoring and diagnostics are included. n a current differential scheme, the L90s exchange data via the communication Typical two and three terminal application of L90. L90 supports a variety of media cards for signalling between L90 s including direct multimode or single mode fibre, RS422, G.703 and EEE C

4 FlexLogic TM Designer Flexlogic allows for customizing the L90 to operate and control the breakers and other auxiliary devices needed to fit most line protection schemes and applications. Single-Pole Tripping The L90 relay uses a state-of- the-art dual phase selection algorithm that provides fast and accurate fault type identification even under weak-infeed conditions. Direct transfer trip (DTT) Use the direct transfer trip feature of L90 to trip remote breaker. Both single pole and three pole direct transfer trips are supported. Up to eight signals can be sent over pilot communications channels selectable through user configurable logic. Autoreclosing The L90 provides multi-shot auto reclosing for single pole or three pole auto relcose on all types of faults with independently settable dead time for each shot. Autoreclose can be dynamically blocked by user programmable logic. Four different auto-relcose modes are available enabling the users to select the reclosing mode to suit specific applications. Synchronism Check The L90 monitors voltage difference, phase angle difference and slip frequency to ensure proper breaker closure as per user requirements. The L90 provides additional enhancements in synchronizing by allowing synchrocheck verification between local and remote line terminal voltages. Breaker Failure The L90 is able to provide fully independent breaker failure protection for the breakers associated to the line when connected to a substation with a breaker-and-a-half or ring bus arrangement. The L90 provides the required elements to perform two independent breaker failure functions. Multiple Breaker Configurations The L90 supports multi-breaker busbar configurations such as breaker-and-a-half or ring bus arrangements, providing dual breaker auto reclose, dual synch-check elements, and dual independent Breaker Failure elements. The design provides secure operation during external faults with possible CT saturation Special Applications - Distributed Busbar Use the L90 s capability of supporting up to 4 directly connected CTs for applications where the use of conventional bus differential relaying is not practical or economically feasible. The L90 can be used to protect both line and buses by measuring currents from the feeder CTs as shown. The L90 provides primary protection for both the buses and the circuit connecting them. EC 850 Process Bus The EC 850 Process Bus module is designed to interface with the Multilin HardFiber System, allowing bi-directional EC 850 fiber optic communications. The HardFiber System is designed to integrate seamlessly with the existing Universal Relay applications, including protection functions, FlexLogic, metering and communications. HardFiber System benefits: Communicates using open standard EC 850 messaging Drastically reduces P&C design, installation and testing labor by eliminating individual copper terminations ntegrates with existing C70 s by replacing traditional CT/T inputs with EC 850 Process Bus module Does not introduce new Cyber Security concerns Advanced Automation The L90 incorporates advanced automation features including powerful FlexLogic programmable logic, communication, and SCADA capabilities that far surpass what is found in the average line relay. The L90 integrates seamlessly with other UR relays for complete system protection. FlexLogic FlexLogic is the powerful UR-platform programming logic engine that provides the ability to create customized protection and control schemes thereby minimizing the need, and associated costs, of auxiliary components and wiring. Using FlexLogic, the L90 can provide required tripping and custom scheme logic for line breaker control and interlocking and dynamic setting group changes. Scalable Hardware The L90 is available with a multitude of /O configurations to suit the most demanding application needs. The expandable modular design allows for easy configuration and future upgrades. Flexible, modular /O covering a broad range of input signals and tripping schemes Mechanically latching can be used to develop secure interlocking applications and replace electromechanical lockout relays 204

5 Monitoring and Metering The L90 includes high accuracy metering and recording for all AC signals. oltage, current, and power metering are built into the relay as a standard feature. Current and voltage parameters are available as total RMS magnitude, and as fundamental frequency magnitude and angle. Fault and Disturbance Recording The advanced disturbance and event recording features within the L90 can significantly reduce the time needed for postmortem analysis of power system events and creation of regulatory reports. Recording functions include: Sequence of Event (SOE) time stamped events Oscillography, - 4 digital & up to 40 Analog channels Data Logger, disturbance recording channels up to sample / cycle / channel Fault Reports - Powerful summary report of pre-fault and fault values Multi-ended fault location - calculating fault location on two or three terminal lines with 2% accuracy The very high sampling rate and large amount of storage space available for data recording in the L90 can eliminate the need for installing costly standalone recording equipment. Advanced Device Health Diagnostics The L90 performs comprehensive device health diagnostic tests during startup and continuously at runtime to test its own major functions and critical hardware. These diagnostic tests monitor for conditions that could impact security and availability of protection, and present device status via SCADA communications and front panel display. Providing continuous monitoring and early detection of possible issues helps improve system uptime. Comprehensive device health diagnostic performed during startup Monitors the CT/T input circuitry to validate the integrity of all signals Communications The L90 provides for secure remote data and engineering access, making it easy and flexible to use and integrate into new and existing infrastructures. Fiber optic Ethernet provides high-bandwidth communications allowing for low-latency controls and high-speed file transfers of relay fault and event record information. The available redundant Ethernet option and the embedded managed Ethernet switch provide the means of creating fault tolerant communication architectures in an easy, cost-effective manner. The L90 supports the most popular industry standard protocols enabling easy, direct integration into monitoring and SCADA systems. EC850 DNP3.0 EC Modbus RTU, Modbus TCP/P nteroperability with Embedded EC 850 The L90 with integrated EC 850 can be used to lower costs associated with line protection, control and automation. GE Energy s leadership in EC 850 comes from thousands of installed devices and follows on Multilin s extensive development experience with UCA 2.0. Replace expensive copper wiring between devices with direct transfer of data using GOOSE messaging Configure systems based on EC 850 and also monitor and troubleshoot them in real-time with Enerista iewpoint Engineer ntegrate Multilin EDs and generic EC 850-compliant devices seamlessly in Enerista iewpoint Monitoring Multi-Language The L90 supports English, French, Russian, and Chinese languages on the front panel, Enerista setup software, and product manual. Easily switch between English and an additional language on the local displays without uploading new firmware. CT CB CB2 CT2 L90- CT CT2 CT3 CT4 T PH PH T2 Communication channel CB CB5 CB2 CB CB3 CB7 CB4 BUS BUS2 L90 CT5 CT CT7 T3 L90-2 Example of Distributed Bus Differential Protection Application. PROTECTED LNE L90 Breaker-and-a-Half Application example. 205

6 Enerista TM Software The Enerista Suite is an industryleading set of software programs that simplifies every aspect of using the L90 relay. The Enerista suite provides all the tools to monitor the status of the protected asset, maintain the relay, and integrate information measured by the L90 into DCS or SCADA monitoring systems. Convenient COMTRADE and Sequence of Events viewers are an integral part of the UR Setup software included with every UR relay, to carry out postmortem event analysis to ensure proper protection system operation. Enerista Launchpad Enerista Launchpad is a powerful software package that provides users with all of the setup and support tools needed for configuring and maintaining Multilin products. The setup software within Launchpad allows configuring devices in real-time by communicating using serial, Ethernet, or modem connections, or offline by creating setting files to be sent to devices at a later time. ncluded in Launchpad is a document archiving and management system that ensures critical documentation is up-to-date and available when needed. Documents made available include: Manuals & Brochures Application Notes Guideform Specifications Wiring Diagrams FAQ s Service Bulletins iewpoint Monitoring iewpoint Monitoring is a simple-to-use and full-featured monitoring and data recording software package for small systems. iewpoint Monitoring provides a complete HM package with the following functionality: Plug-&-Play Device Monitoring System Single-Line Monitoring & Control Annunciator Alarm Screens Trending Reports Automatic Event Retrieval Automatic Waveform Retrieval iewpoint Engineer iewpoint Engineer is a set of powerful tools that will allow the configuration and testing of UR relays at a system level in an easy-touse graphical drag-and-drop environment. iewpoint Engineer provides the following configuration and commissioning utilities: Graphical Logic Designer Graphical System Designer Graphical Logic Monitor Graphical System Monitor iewpoint Maintenance iewpoint Maintenance provides tools that will create reports on the operating status of the relay, simplify the steps to download fault and event data, and reduce the work required for cyber-security compliance audits. Tools available in iewpoint Maintenance include: Settings Security Audit Report Device Health Report Single Click Fault Data Retrieval Enerista ntegrator Enerista ntegrator is a toolkit that allows seamless integration of Multilin devices into new or existing automation systems. ncluded in Enerista ntegrator is: OPC/DDE Server Multilin Drivers Automatic Event Retrieval Automatic Waveform Retrieval User nterface The L90 front panel provides extensive local HM capabilities. The local display is used for monitoring, status messaging, fault diagnosis, and device configuration. User configurable messages that combine text with live data, can be displayed when user-defined conditions are met. Power System Troubleshooting Record the operation of the internal L90 elements and external connected devices with ms time-stamped accuracy to identify the Sequence of Operation of station devices during line faults and disturbances. Analyze line faults using both analog and digital power system quantities that are measured and recorded up to a rate of 4 samples per cycle. Graphically view zone settings for ground phase distance elements for the selected zones and the power swing detection element. 20

7 L90 Line Differential System Typical Wiring L90-H00-HCL-F8F-HG-LD-NK-SC-UH-W7A L90 A B C 52 Power supply 9 CPU 7 COM 8 CT/T nputs/ nputs/ nputs/ nputs/ nputs/ J U M X L W K B H T D N G S F P R RS-232 DB-9 (front) UR COMPUTER TXD RXD RXD TXD SGND SGND CONNECTOR PERSONAL COMPUTER CONNECTOR DC TO REMOTE L90 OPTONAL TC TC N 2 Ha H2b Hc Hb H2c H2a H4a H4c H3b H3a H4b H3c SURGE Ha H8a H5b H7b H8b H5a H7a Hc H8c H5c H7c H H2 H3 H4 G U8a U7b U7a U8c U7c Ub U2b U3b U4b U5b Ub Ua U2a U3a U4a U5a Ua Uc U2c U3c U4c U5c Uc SURGE U8b U U5 U2 U U3 U4 H N7a Na N2b N7c Nc N7b Nb N8c N8b N2c N8a N2a N4a N5b N4c Nb N3b N3a Na N4b N5c N5a N3c Nc K N N5 N2 N N3 N7 N4 N8 CRTCAL FALURE OUTPUT CONTROL POWER H LO FLTER SURGE B3a Bb B8a Bb B8b Ba B3b Ba B2b B5b Tx Rx Tx2 Rx2 NTER-RELAY COMMS. W7A FBER FBER C S S5 S2 S S3 S7 S4 S8 S7a Sa S2b S7c Sc S7b Sb S8c S8b S2c S8a S2a S4a S5b S4c Sb S3b S3a Sa S4b S5c S5a S3c Sc La L8a L5b L7b L5a L7a Lc L8c L5c L7c SURGE La L8b L4c L2c L3a L3c Lc L3b Lb L4a L2a D minimum PRODED 8L Fc F4a F3c F2c F4c Fa F4b Fb F2a F3a F2b F3b A B C G A5 A B5 C5 G5 B C G F8c F8a F5a F5c F7c Fa F7a Fc X A B C X A B C Multilin com 0BaseFL 0BaseFL 0BaseT Da D2a D4b D3a D4a RG-B nput RG-B Output COM RS485 ALTERNATE NORMAL Tx2 Rx2 Tx Rx BNC BNC Fibre Optic Remote Device Shielded Co-axial Co-axial com 0BaseFL 0BaseFL 0BaseT Da D2a D4b D3a D4a RG-B nput RG-B Output COM RS485 ALTERNATE NORMAL Tx2 Rx2 Tx Rx BNC BNC Fibre Optic Remote Device Shielded Co-axial Co-axial

8 Ordering L H - F - H - L - N - S - U -W/X For Horizontal Mount Base Unit L90 Base Unit CPU E RS485 + RS485 (EC850 option not available) G RS485 + Multi-mode ST 0BaseF H RS485 + Mutli-mode ST Redundant 0BaseF J RS485 + Multi-mode ST 00BaseFX K RS485 + Multi-mode ST Redundant 00BaseFX N RS /00 BaseT S RS485 + port, 00 Mbps, Managed Ethernet Switch Software 00 No Software Options 02 Breaker and Half software 03 EC Breaker and Half + EC850 0 Phasor Measurement Unit (PMU) 07 EC850 + Phasor Measurement Unit (PMU) 08 Breaker & Half + Phasor Measurement Unit (PMU) 09 Breaker & Half + EC850 + Phasor Measurement Unit (PMU) Mount / Coating H Horizontal (9" rack) - Standard A Horizontal (9" rack) - Harsh Chemical Environment Option ertical (3/4 size) - Standard B ertical (3/4 size) - Harsh Chemical Environment Option User nterface K Enhanced English Front Panel L Enhanced English Front Panel with User-Programmable Pushbuttons M Enhanced French Front Panel N Enhanced French Front Panel with User-Programmable Pushbuttons Q Enhanced Russian Front Panel T Enhanced Russian Front Panel with User-Programmable Pushbuttons U Enhanced Chinese Front Panel Enhanced Chinese Front Panel with User-Programmable Pushbuttons F ertical Front Panel with English display Power Supply H 25 / 250 AC/DC H RH 25/250 AC/DC with redundant 25/250 AC/DC L (DC only) CT/T DSP 8L 8L Standard 4CT/4T w/ enhanced diagnostics 8N 8N Standard 8CT w/ enhanced diagnostics EC 850 Process Bus 8 8 Port EC 850 Process Bus Module Digital /O XX XX XX XX XX No Module 4A 4A 4A 4A 4A 4 Solid State (No Monitoring) MOSFET Outputs 4C 4C 4C 4C 4C 4 Solid State (Current w/opt oltage) MOSFET Outputs 4D 4D 4D 4D 4D Digital nputs with Auto-Burnish 4L 4L 4L 4L 4L 4 Form-A (No Monitoring) Latchable Outputs Form-A (No Monitoring) Outputs C C C C C 8 Form-C Outputs D D D D D Digital nputs E E E E E 4 Form-C Outputs, 8 Digital nputs F F F F F 8 Fast Form-C Outputs K K K K K 4 Form-C & 4 Fast Form-C Outputs L L L L L 2 Form-A (Current w/ opt oltage) & 2 Form-C Outputs, 8 Digital nputs M M M M M 2 Form-A (Current w/ opt oltage) & 4 Form-C Outputs, 4 Digital nputs N N N N N 4 Form-A (Current w/ opt oltage) Outputs, 8 Digital nputs P P P P P Form-A (Current w/ opt oltage) Outputs, 4 Digital nputs R R R R R 2 Form-A (No Monitoring) & 2 Form-C Outputs, 8 Digital nputs S S S S S 2 Form-A (No Monitoring) & 4 Form-C Outputs, 4 Digital nputs T T T T T 4 Form-A (No Monitoring) Outputs, 8 Digital nputs U U U U U Form-A (No Monitoring) Outputs, 4 Digital nputs 2 Form-A (Cur w/ opt olt) Form-C Output, 2 Latching Outputs, 8 Digital nputs Transducer /O 5A 5A 5A 5A 5A 4 dcma nputs, 4 dcma Outputs 5F 5F 5F 5F 5F 8 dcma nputs nter-relay Communications 7A 820 nm, multi-mode, LED, Channel 7B 300 nm, multi-mode, LED, Channel 7C 300 nm, single-mode, ELED, Channel 7H 820 nm, multi-mode, LED, 2 Channels nm, multi-mode, LED, 2 Channels 7J 300 nm, single-mode, ELED, 2 Channels 7S G.703, 2 Channels 7W RS422, 2 Channels 7 RS422, 2 Channels, Dual Clock nm, single-mode, LASER, 2 Channel 7 EEE C37.94, 820 nm, multimode, LED, Channel 77 EEE C37.94, 820 nm, multimode, LED, 2 Channel 2B C37.94SM, 300nm Singlemode, ELED, 2 Channel Single mode 2S port, 00 Mbps, Managed Ethernet Switch, H (25/250 AC/DC) 2T port, 00 Mbps, Managed Ethernet Switch, LO (24-48 dc) Ordering Notes: - For vertical mounting order codes, please visit our online store 2 - To view the latest options available for the L90, or to order the UR Classic Front Panel, please visit our online store for more details. Accessories for the L90 UR Applications Learning CD TRCD-URA-C-S- Multilink Ethernet Switch ML2400-F-H-H-A2-A2-A-G iewpoint Engineer PE- iewpoint Maintenance PM- iewpoint Monitoring EC850 P--850 isit to: iew Guideform specifications Download the instruction manual Review applications notes and support documents Buy a L90 online iew the UR Family brochure v5