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H3C S5810-50S Installation Manual Download Page 25

 

2-3 

 

When an optional interface module or SFP/SFP+ module on the S5810 series is operating, do not stare 
into the optical port because the laser light emitted from the optical fiber may hurt your eyes. 

 

Installation Tools 

z

 

Flat-blade screwdriver 

z

 

Phillips screwdriver 

z

 

ESD-preventive wrist strap 

 

 

The installation tools are not shipped with the S5810 series. 

 

Summary of Contents for S5810-50S

Page 1: ...H3C S5810 Series Ethernet Switches Installation Manual Hangzhou H3C Technologies Co Ltd Manual Version 6W100 20090626 ...

Page 2: ...are Secware Storware NQA VVG V2 G Vn G PSPT XGbus N Bus TiGem InnoVision and HUASAN are trademarks of Hangzhou H3C Technologies Co Ltd All other trademarks that may be mentioned in this manual are the property of their respective owners Notice The information in this document is subject to change without notice Every effort has been made in the preparation of this document to ensure accuracy of th...

Page 3: ...ower on and initialization of system files and so on 5 Loading Software Introduces how to loading application files and upgrading the Boot ROM program by using the host software package 6 Maintenance and Troubleshooting Introduces how to maintain software and hardware of the H3C S5810 series Appendix Appendix A Lightning protection of the H3C S5810 series switch Conventions The manual uses the fol...

Page 4: ...u can obtain different categories of product documentation Products Solutions Provides information about products and technologies Technical Support Document Technical Documents Provides several categories of product documentation such as installation configuration and maintenance Technical Support Document Software Download Provides the documentation released with the software version Documentati...

Page 5: ...e X SFP Interface Status LED 1 12 SFP Interface Status LED 1 13 Management Ethernet Port Status LED 1 13 Hot Swappable Power Modules 1 14 AC Power Module 1 14 DC Power Module 1 14 Ventilation System 1 15 2 Installation Preparations 2 1 Safety Precautions 2 1 Installation Site 2 1 Temperature Humidity 2 1 Cleanness 2 2 Electromagnetic Susceptibility 2 2 Laser Safety 2 2 Installation Tools 2 3 3 Ins...

Page 6: ...5 Changing the Boot Mode 4 7 5 Loading Software 5 1 Introduction 5 1 Approaches for Loading Software 5 1 Loading Software Through the Boot ROM Menu 5 2 Introduction to the Boot ROM Menu 5 2 Loading Software Using XMODEM Through Console Port 5 4 Loading Software Using TFTP Through Ethernet Port 5 11 Loading Software Using FTP Through Ethernet Port 5 14 Loading Software Through CLI 5 17 Loading Soft...

Page 7: ...ble 1 1 The S5810 series system specifications Item S5810 50S S5810 50S DC Dimensions H W D 43 6 440 420 mm 1 72 17 32 16 54 in Weight 8 kg 17 64 lb Service port Forty eight 10 100 1000Base T auto sensing Ethernet ports Two 100 1000Base X SFP Combo ports Two 10 GE SFP interfaces Console port 1 Management Ethernet port 1 USB interface 1 A type USB interface AC Rated voltage range 100 VAC to 240 VAC...

Page 8: ...tus LED 5 System LED SYS 6 Power module 1 status LED PWR1 7 Power module 2 status LED PWR2 8 10 GE SFP interface 9 100 1000Base X SFP interface The top right area on the front panel of the S5810 50S switch is the management area The management area provides LEDs and ports used for management and maintenance Figure 1 2 Management area of the S5810 50S switch 1 Seven segment LED 2 Mode switching but...

Page 9: ... pull out the strip rudely or turn over the panel excessively otherwise the rubber strip may fall off or be broken z Before pushing in the logo panel make sure that the pin on the left side of the logo panel is inserted in the corresponding recess of the chassis Then clip the right side of the panel to the corresponding recess of the chassis and push the logo panel until the clip is locked to the ...

Page 10: ...pped Power module 2 is installed with a filler panel You can select two power modules to implement 1 1 power supply redundancy See Hot Swappable Power Modules on page 1 14 for the power module models supported by the S5810 series See H3C PSR300 12A PSR300 12D1 Power Modules User Manual for the detailed description of the power modules S5810 50S DC Front Panel The front panel of the S5810 50S DC is...

Page 11: ... supported by the S5810 series See H3C PSR300 12A PSR300 12D1 Power Module User Manual for the detailed description of the power modules Ports Console Port Each S5810 series provides one console port on the front panel Table 1 2 describes the console port specifications Table 1 2 Console port specifications Item Specification Connector type RJ 45 Compliant standard EIA TIA 232 Transmission baud ra...

Page 12: ...load speed of 12 Mbps With this USB interface you can access the file system on the flash of the switch to upload or download application and configuration files 10 100 1000Base T Ethernet Port Each S5810 series provides forty eight 10 100 1000Base T Ethernet ports on its front panel Table 1 4 describes the specifications of the 10 100 1000Base T Ethernet ports Table 1 4 S5810 series 10 100 1000Ba...

Page 13: ... can select SFP modules listed in Table 1 7 as needed Table 1 7 SFP modules supported by SFP interfaces SFP modul e type SFP module Central wavelength Connector Fiber Max transmissi on distance 50 125µm multimode optical fiber 550 m 1804 5 ft SFP GE SX MM850 A 850nm 62 5 125µm multimode optical fiber 275 m 902 2 ft SFP GE LX SM1310 A 10 km 6 2 mi SFP GE LH40 SM1310 1310nm 40 km 24 9 mi SFP GE LH40...

Page 14: ...s may update with time For information about SFP modules contact technical support z For the models and specifications of each kind of optical modules refer to H3C Low End Series Ethernet Switches Pluggable Modules Manual SFP Interface Each S5810 series provides two fixed SFP interfaces on its front panel You can connect SFP modules or SFP cables to the SFP interfaces as needed to enhance the netw...

Page 15: ...or information about transceivers contact technical support z For the models and specifications of each kind of transceivers refer to H3C Low End Series Ethernet Switches Pluggable Modules Manual LEDs Table 1 9 LEDs LED Description System status LED See System LED on page 1 10 Hot swappable power module LED See Power Module Status LEDs on page 1 10 Seven segment LED See Seven Segment LED on page 1...

Page 16: ...odule Refer to Table 1 11 for details Table 1 11 Description of the power module status LEDs Mark Status Status Steady green Hot swappable power module slot 1 is installed with a power module and the power input is normal Steady yellow Hot swappable power module slot 1 is installed with a power module but an output failure occurs PWR1 Off No power module is installed in hot swappable power module ...

Page 17: ... LED flashes and displays t Over temperature alarm The LED displays C The current switch is the command switch in the cluster The LED displays S The current switch is a member switch in the cluster The LED displays c The current switch is a candidate switch in the cluster Unit Steady green The LED displays the specific numbers The member ID of the current switch Port Mode LED The port mode LED on ...

Page 18: ... port Steady green rate mode Off No link is present on the port Steady green The port operates in full duplex mode the LED is fast flashing when data is being sent and or received on the port Yellow The port operates in half duplex mode the LED is fast flashing when data is being sent and or received on the port Flashing yellow 3 Hz POST failed on the port Steady yellow duplex mode Off No link is ...

Page 19: ...rate of 10 Gbps the LED is fast flashing when data is being sent and or received on the port Flashing yellow 3 Hz POST failed on the port Steady green rate mode Off No link is present on the port Steady green The port operates in full duplex mode the LED is fast flashing when data is being sent and or received on the port Flashing yellow 3 Hz POST failed on the port Steady yellow duplex mode Off N...

Page 20: ...witch on the power module Install the power module Connect the power cord Switch on the power module Figure 1 9 Removal procedure Switch off the power module Disconnect the power cord Remove the power module Switch off the power module Disconnect the power cord Remove the power module AC Power Module The S5810 series uses PSR300 12A as the AC power module The specifications of PSR300 12A are illus...

Page 21: ...f your installation environment The ventilation process of the S5810 series is shown in Figure 1 10 Air goes in from the air vents at both sides of the chassis takes the heat generated from the chassis and the power modules and then goes out from the exhaust vents of the turbo fan and power modules The chassis and power modules use separate air channels for heat dissipation Make sure that both air...

Page 22: ...tive humidity noncondensing 5 to 90 Storage temperature 40 C to 75 C 40 F to 167 F Storage relative humidity noncondensing 5 to 95 You can judge whether the fan works normally by checking the system status LED and the seven segment LED for details refer to Table 1 12 If a failure occurs replace the turbo fan in time for how to replace a turbo fan refer to Installing a Fan Tray For detailed informa...

Page 23: ...s Installation Site The S5810 series must be used indoors You can mount the switch in a rack or on a workbench but make sure z Adequate clearance is reserved at the air inlet exhaust vents for ventilation z The rack or workbench has a good ventilation system z The rack is sturdy enough to support the device and its accessories z The rack or workbench is well earthed To ensure normal operation and ...

Page 24: ...armful gases such as SO2 H2S NH3 and Cl2 For specific requirements see the following table Table 2 2 Harmful gas limits in the equipment room Gas Maximum concentration mg m3 SO2 0 2 H2S 0 006 NH3 0 05 Cl2 0 01 Electromagnetic Susceptibility The operation of your switch can be affected by external interferences such as conducted emission by capacitance coupling inductance coupling electromagnetic w...

Page 25: ...is operating do not stare into the optical port because the laser light emitted from the optical fiber may hurt your eyes Installation Tools z Flat blade screwdriver z Phillips screwdriver z ESD preventive wrist strap The installation tools are not shipped with the S5810 series ...

Page 26: ...the installation procedures of this chapter are only for illustration sake For real appearance of the switch refer to the actual product Installing the Switch into a 19 Inch Rack Using Mounting Brackets The S5810 series switches can be installed into a 19 inch rack with load bearing mounting brackets Figure 3 1 show how to install an S5810 switch into a 19 inch rack Figure 3 1 Install an S5810 int...

Page 27: ...ten the M4x8 screws Figure 3 3 Attach the mounting bracket to an S5810 for front mounting Figure 3 4 Attach the mounting bracket to an S5810 for center mounting Figure 3 5 Attach the mounting bracket to an S5810 for rear mounting Mounting the Switch to a Rack 1 Wear an ESD preventive wrist strap and make sure the rack is well grounded and is firm enough to hold the switch and cables 2 Attach the m...

Page 28: ...ed on the rack you can mount the switch to the rack with mounting brackets and trays Put the switch on the support tray and slide the switch to an appropriate place Then fix the mounting brackets Figure 3 6 Mount the S5810 to a rack ...

Page 29: ...g terminals in this section are for illustration only The power input end of the switch is connected with a noise filter whose central ground is directly connected to the chassis forming the so called chassis ground commonly known as PGND This chassis ground must be securely connected to the earth so that the faradism and leakage electricity can be safely released to the earth enhancing the EMS ca...

Page 30: ...naked metal part through the black insulation covering into the end of the OT terminal Two OT terminals are provided with the PGND cable when shipped with the switch select a proper OT terminal according to the size of the grounding post Step3 Secure the metal part of the cable to the OT terminal with a crimper and then cover it with the insulation covering Then heat the insulation covering with a...

Page 31: ...e angel iron or steel tube and treat the joint for corrosion protection Figure 3 9 Ground the switch by burying the grounding conductor into the earth 1 Grounding screw 2 PGND cable 3 Earth 4 Joint 5 Grounding conductor 6 Switch rear panel In Other Installation Sites When the switch is AC powered For an AC powered switch if neither of the above mentioned two conditions is available ground the swit...

Page 32: ...vailable ground the switch through the return wire RTN of the DC power supply In this case make sure this RTN wire is well connected to the ground at the DC output of the DC power cabinet Figure 3 11 Ground through the PGND of a power cabinet 2 1 3 4 5 6 8 10 11 7 9 1 DC power input 2 Switch rear panel 3 Grounding screw 4 PGND cable 5 AC DC power cabinet 6 48V strip 7 48V 8 RTN strip 9 RTN 10 PGND...

Page 33: ...cedure Install the power module Connect the power cord Switch on the power module Install the power module Connect the power cord Switch on the power module Figure 3 13 Removal procedure Switch off the power module Disconnect the power cord Remove the power module Switch off the power module Disconnect the power cord Remove the power module Installing the Power Module Step1 Wear an ESD preventive ...

Page 34: ...steps Step1 Wear an ESD preventive wrist strap ensure a good skin contact and make sure that the ESD preventive wrist strap is properly grounded Step2 Switch off the power module and disconnect the power cord Step3 Face the power module to be removed from the powered device Step4 Loosen the captive screw of the power module anti clockwise with a Philips screwdriver until the captive screw falls of...

Page 35: ...e see callout 2 in Figure 3 16 Step5 Connect the other end of the AC power cord to the external AC power supply system Figure 3 15 Connect an AC power cord I Figure 3 16 Connect an AC power cord II Connecting a DC Power Cord Step1 Switch off the DC power module Step2 Keep the upside of the DC plug shipped with the device on top and plug it in the DC receptacle see callout 1 in Figure 3 17 If you p...

Page 36: ...the power cord to avoid connection mistakes Verifying the Installation Before powering on the switch check that z There is enough space for heat dissipation around the switch and the rack or workbench is stable z The ground wire is connected z The selected power module matches that required by the switch z The power cables are properly connected z All the interface cables are cabled indoors If the...

Page 37: ...nfiguration environment setup Connecting the Console Cable Console Cable A console cable is an 8 core shielded cable One end of the cable is a crimped RJ 45 connector which is connected to the console port of the switch and the other end is a DB 9 female connector which is connected to the serial port on the console terminal as shown below Figure 4 2 Console cable Table 4 1 Console cable pinouts R...

Page 38: ... switch z When disconnecting a PC from a powered on switch you are recommended to disconnect the DB 9 connector of the console cable from the PC after disconnecting the RJ 45 connector from the switch Setting Terminal Parameters When setting up the configuration environment through the console port the terminal or PC can use the terminal emulation program to communicate with the switch You can run...

Page 39: ...enter the HyperTerminal window The Connection Description dialog box appears as shown below Figure 4 3 Connection description of the HyperTerminal Step2 Type the name of the new connection in the Name text box and click OK The following dialog box appears Select the serial port to be used from the Connect using drop down list Figure 4 4 Set the serial port used by the HyperTerminal connection ...

Page 40: ...et Bits per second to 9600 Data bits to 8 Parity to None Stop bits to 1 and Flow control to None Figure 4 5 Set the serial port parameters Step4 Click OK after setting the serial port parameters and the system enters the HyperTerminal window shown below Figure 4 6 HyperTerminal window ...

Page 41: ... that z The power cable is properly connected z The power supply voltage meets the requirement of the switch z The console cable is properly connected the terminal or PC used for configuration has been started and the configuration parameters have been set Powering On the Switch The S5810 series have the same Boot ROM display style This document uses the Boot ROM output information on the S5810 50...

Page 42: ... is five second The following section describes the setting of the startup mode z If you press Ctrl B within one second the Boot ROM menu is displayed BOOT MENU 1 Download application file to flash 2 Select application file to boot 3 Display all files in flash 4 Delete file from flash 5 Modify BootRom password 6 Enter BootRom upgrade menu 7 Skip current configuration file 8 Set BootRom password re...

Page 43: ...o get the main application file flash S5810_RELEASE bin The main application file is self decompressing Done System is starting Board checking LSW158150S Switch chip selftest OK SDRAM fast selftest NOT TEST Flash fast selftest OK PHY selftest OK CPLD selftest OK Please check port leds finished The switch Mac is 00E0 FC00 5810 User interface aux0 is available Press ENTER to get started The appearan...

Page 44: ...displays the following information Setting Done BOOT MENU 1 Download application file to flash 2 Select application file to boot 3 Display all files in flash 4 Delete file from flash 5 Modify BootRom password 6 Enter BootRom upgrade menu 7 Skip current system configuration 8 Set BootRom password recovery 9 Set switch startup mode 0 Reboot Enter your choice 0 9 Enter 0 The system reboots in fast st...

Page 45: ...ip selftest OK SDRAM fast selftest NOT TEST Flash fast selftest OK PHY selftest OK CPLD selftest OK Please check port leds finished User interface aux0 is available Press ENTER to get started The appearance of Press ENTER to get started indicates that the automatic startup of the switch is complete Press Enter The following prompt is displayed H3C You can configure the switch now z To switch to th...

Page 46: ...for upgrade are complete Boot ROM files A complete Boot ROM file includes a basic section and an extended section z The basic Boot ROM section is the smallest program file used to complete the primary initialization of the system z With rich human computer interaction HCI functions the extended Boot ROM section uses Ethernet interfaces for upgrading the applications and the boot system Approaches ...

Page 47: ...les in file loading Loading Software Through the Boot ROM Menu To load the Boot ROM and application files through the Boot ROM menu you need to correctly connect a user terminal to the switch using a console cable Introduction to the Boot ROM Menu Starting H3C S5810 50S BOOTROM Version 103 Copyright c 2004 2008 Hangzhou H3C Technologies Co Ltd Creation Date Dec 15 2008 14 19 14 CPU Clock Speed 750...

Page 48: ...et BootRom password recovery 9 Set switch startup mode 0 Reboot Enter your choice 0 9 The items in the Boot ROM menu are described in Table 5 2 Table 5 2 Description of the Boot ROM menu Item Description 1 Download application file to flash Download the application file to the flash memory 2 Select application file to boot Select the application file to boot 3 Display all files in flash Display al...

Page 49: ...ogram checks it using the agreed upon check method If the check succeeds the receiving program sends an acknowledgement character if the check fails it sends a reject character Upon receipt of the acknowledgement the sending program continues to send the next packet upon receipt of the reject it retransmits the packet Upgrading the Boot ROM program Complete the following tasks to update the Boot R...

Page 50: ...tRom 2 Update extended BootRom 3 Update basic BootRom 0 Return to boot menu Enter your choice 0 3 The items in the Boot ROM update menu are described in Table 5 3 Table 5 3 Description of the Boot ROM update menu Item Description 1 Update full BootRom Update the complete Boot ROM file 2 Update extended BootRom Update the extended Boot ROM section 3 Update basic BootRom Update the basic Boot ROM se...

Page 51: ...ayed Download baudrate is 115200 bps Please change the terminal s baudrate to 115200 bps and select XMODEM protocol Press enter key when ready Now that the console communication baud rate of the switch has been changed to 115200 bps while that of the terminal is still 9600 bps the two sides cannot communicate with each other According to the prompt you need to change the baud rate of the terminal ...

Page 52: ...al from the switch Step2 Select File Properties In the Properties dialog box click Configure as shown in Figure 5 2 and then select 115200 from the Bits per second drop down list box as shown in Figure 5 3 Figure 5 2 Properties dialog box ...

Page 53: ...application file from the terminal to the switch Step1 After establishing a connection between the terminal and the switch press Enter in the HyperTerminal window to enter the system file downloading state The following information is displayed Now please start transfer file with XMODEM protocol If you want to exit Press Ctrl X Loading CCCCCCCCCC Press Ctrl X to quit downloading files otherwise pr...

Page 54: ...loaded for example update bin and select Xmodem from the Protocol drop down list Figure 5 5 Transfer menu Figure 5 6 File transmission dialog box Step3 Click Send The following dialog box appears Figure 5 7 Send the application file using XMODEM 7 Update the Boot ROM file on the switch After the Boot ROM file is downloaded the terminal displays the following information Loading CCCC Done ...

Page 55: ...Press any key to return to the Boot ROM update menu 1 Update full BootRom 2 Update extended BootRom 3 Update basic BootRom 0 Return to boot menu Enter your choice 0 3 Enter 0 to return to the Boot ROM menu and then enter 0 again After that the device is restarted and the updated Boot ROM file becomes effective Loading an application file To load the application file of the switch enter 1 in the Bo...

Page 56: ...nal Parameters on page 4 2 Task Remarks Set up the configuration environment Required Connect the switch to the TFTP server through an Ethernet port and to a PC through the console port The PC and the TFTP server can be the same device Run the TFTP Server program on the sever Required Run the terminal emulation program on the PC connected with the switch s console port Start the switch and enter t...

Page 57: ...self 2 Run the TFTP Server program on the sever Run TFTP Server on the server connected with the switch s Ethernet port and specify the path of the application file to be downloaded 3 Run the terminal emulation program on the PC connected with the switch s console port Start the switch and enter the Boot ROM menu Then enter the protocol parameter setting menu If you want to load the Boot ROM file ...

Page 58: ... gateway s IP address if they are not on the same segment you need to specify the gateway s IP address so that the switch can communicate with the server 6 Update the Boot ROM file on the switch Enter the corresponding parameters based on the actual condition The system displays the following information Loading Done Will you Update Basic BootRom Y N Y The system asks you whether you want to updat...

Page 59: ... file rather than upgrading the Boot ROM program After loading the application file the switch displays that you should configure the application attribute that is main backup or none Type a specific attribute to complete loading the application file Writing flash Done Please input the file attribute Main Backup None M Done If an application file with a specific attribute already exists when you s...

Page 60: ... the switch to make the updated Boot ROM file effective 1 Set up the configuration environment Connect an Ethernet port GigabitEthernet 1 0 25 for example of the switch to the server whose IP address is available that provides the file usually the bin file to be downloaded and connect the console port of the switch to a PC as shown in Figure 5 8 2 Run the FTP Server program on the server Run FTP S...

Page 61: ...e consistent with that configured on the FTP server z Enter the file name and IP addresses based on the actual condition z If the switch and the server are on the same network segment you can specify any unused IP address of the network for the switch without specifying the gateway s IP address if they are not on the same segment you need to specify the gateway s IP address so that the switch can ...

Page 62: ...ter 2 to load the application file The procedure of loading an application file is similar to that of upgrading the Boot ROM program The difference lies in that the system displays the prompt of loading the application file rather than upgrading the Boot ROM program After loading the application file the switch displays that you should configure the application attribute that is main backup or non...

Page 63: ...in slot 1 main This command will set the boot file Continue Y N y The specified file will be used as the main boot file at the next reboot on sl ot 1 H3C display boot loader Current boot app is flash update bin Next main boot app is flash update bin Next backup boot app is flash update bin H3C reboot z After loading the application file use the reboot command to restart the switch to make the upda...

Page 64: ...ogged in successfully ftp get update bin update bin ftp bye Step2 Upgrade the Boot ROM program H3C bootrom update file update bin This command will update bootrom file Continue Y N y Now updating bootrom please wait Step3 Load the application file and specify the file as the main program file H3C boot loader file update bin main This command will set the boot file Continue Y N y The specified file...

Page 65: ...ion files from the flash memory you are recommended to delete the unused host program files then load the application file to the switch through FTP for update z Avoid any power failure during the loading process Loading Software Using TFTP Loading a file through TFTP is similar to loading a file through FTP The switch can serve only as a TFTP client that downloads the file from the TFTP server to...

Page 66: ...ct IP address software name or path of the TFTP server when using TFTP z Enter an incorrect IP address software name username or password when using FTP If software loading fails when there are neither physical connection problems nor input errors please contact your sales agent for help Password Loss User Password Loss If you have forgotten the user password you can enter the Boot ROM menu BOOT M...

Page 67: ...ep z The switch power cord is properly connected z The power supply meets the requirement z The operating temperature of the switch is normal and proper ventilation is ensured for the power module If the cause cannot be located in the preceding steps and the problem persists you need to contact your local sales agent or service engineer To replace a hot swappable power module refer to Installing a...

Page 68: ...reventive wrist strap make sure that the wrist strap has a good skin contact and is well grounded 2 Loosen the screw on the fan tray with a Phillips screwdriver until the screw is completely separated from the device as shown in Figure 6 1 Figure 6 1 Remove an LSW1BFAN 1 3 Holding the handle of the fan tray with one hand pull part of the fan tray out Then supporting the bottom of the fan tray with...

Page 69: ...commended to complete replacing the fan tray within two minutes z To avoid damaging the connectors on a fan tray and backplane slowly insert the fan tray If you feel hard when inserting the fan tray plug out the fan tray and insert it again z If the captive screw cannot be tightly fixed check the installation of the fan tray Configuration Terminal Failure After the switch is powered on and the sys...

Page 70: ... at the configuration terminal the cause might lie in the parameter setting error at the terminal such as HyperTerminal Verify the following terminal parameter such as hyper terminal settings z Baud rate 9 600 z Data bits 8 z Parity none z Stop bits 1 z Flow control none z Emulation VT100 ...

Page 71: ...i Table of Contents Appendix A Lightning Protection of the Switch A 1 Installation of Lightning Arrester for AC Power Socket Strip with Lightning Protection A 1 ...

Page 72: ...ou can use cable clips and screws to fasten the lightning arrester for AC power on the cabinet workbench or the wall of equipment room Figure A 1 Diagram of lightning arrester 1 Working LED green On means the circuit is working normally off means the circuit is damaged 2 Grounding pole detection LED red On indicates a wrong wire connection the wire is not grounded or the live line and null line ar...

Page 73: ...ound wire of the arrester is not well grounded or because the live and zero wires are connected in reverse direction You may check that in the following way When the red LED is on use a multimeter to examine polarity at the power socket of the arrester If it is same to that of the power socket in the equipment room it means that arrester is not well grounded If it is adverse to that of the power s...

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