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TP48200A-D17A5-2 Telecom Power
User Manual

C Associations Between Alarms and Dry Contacts on the

UIM

Issue 04 (2019-12-20)

Associations Between Alarms and Dry

Contacts on the UIM

Table C-1

Associations between dry contacts and alarms

Port Type

Silk Screen

Associated Alarm

Dry contact input ports DIN1

Dry contact input 1

DIN2

Dry contact input 2

DIN3

Dry contact input 3

DIN4

Dry contact input 4

DIN5

Dry contact input 5

DIN6

Dry contact input 6

Dry contact output
ports

The default setting
(closed: alarm; open:
normal) can be
modified.

ALM1

High battery temperature/high ambient temperature/TCU
alarm/Rectifier fault/rectifier communication failure

ALM2

Door status alarm

ALM3

Battery fuse blown/Multi-rectifier fault/AC SPD fault

ALM4

Battery fault

ALM5

DC low voltage alarm

ALM6

Smoke alarm

ALM7

AC power failure

Default mode (closed:
normal; open: alarm)

ALM8

SMU fault

Summary of Contents for TP48200A-D17A5-2 Telecom Power

Page 1: ...TP48200A D17A5 2 Telecom Power User Manual Issue 04 Date 2019 12 20 HUAWEI TECHNOLOGIES CO LTD ...

Page 2: ...tomer All or part of the products services and features described in this document may not be within the purchase scope or the usage scope Unless otherwise specified in the contract all statements information and recommendations in this document are provided AS IS without warranties guarantees or representations of any kind either express or implied The information in this document is subject to c...

Page 3: ...ption Indicates a hazard with a high level of risk which if not avoided will result in death or serious injury Indicates a hazard with a medium level of risk which if not avoided could result in death or serious injury Indicates a hazard with a low level of risk which if not avoided could result in minor or moderate injury Indicates a potentially hazardous situation which if not avoided could resu...

Page 4: ... are cumulative The latest document issue contains all the changes made in earlier issues Issue 04 2019 12 20 Optimized the content about rectifiers Issue 03 2016 06 01 Updated the section Associations Between Alarms and Dry Contacts on the UIM Issue 02 2016 01 10 Added the section Replacing a TCUC Issue 01 2015 11 10 This issue is the first official release ...

Page 5: ...ery Safety 11 2 Product Overview 15 2 1 Introduction 15 2 2 Features 16 2 3 System Configurations 17 3 Components 18 3 1 Interior 18 3 2 PDU 20 3 3 Fan Assembly 21 3 4 Rectifier 21 3 5 SMU02B 23 3 6 UIM02C 26 3 7 Sensor and Lamp 30 3 7 1 Smoke Sensor 30 3 7 2 Temperature and Humidity Sensor 31 3 7 3 Battery Temperature Sensor 32 3 7 4 Light 32 4 Maintenance 33 4 1 Routine Maintenance 33 4 1 1 Cabi...

Page 6: ... SPD 40 4 3 3 Replacing a Circuit Breaker 41 4 3 4 Replacing an SMU 43 4 3 5 Replacing the PCB of UIM02C 44 4 3 6 Replacing the Fan in the Fan Assembly 45 4 3 7 Replacing a TCUC Control Board 48 4 3 8 Replacing an Air Filter 51 4 3 9 Replacing a Smoke Sensor 52 4 3 10 Replacing a Battery Temperature Sensor 54 A Technical Specifications 56 A 1 Environmental Specifications 56 A 2 Electrical Specific...

Page 7: ...age are not covered under the warranty Follow local laws and regulations when installing operating or maintaining the equipment The safety instructions in this document are only supplements to local laws and regulations Huawei will not be liable for any consequences of the following circumstances Operation beyond the conditions specified in this document Installation or use in environments which a...

Page 8: ...igure Follow the specified procedures for installation operation and maintenance Ensure that bolts are tightened with a torque wrench and marked using red or blue color Installation personnel mark tightened bolts in blue Quality inspection personnel confirm if the bolts are tightened and then mark them in red The marks should cross the edges of the bolts as shown in the following figure Before ins...

Page 9: ... the case of a fire immediately leave the building or the equipment area and turn on the fire alarm bell or make an emergency call Do not enter the building on fire in any case Do not stop using protective devices Pay attention to the warnings cautions and related precautionary measures in this document and on the equipment Promptly replace warning labels that have worn out Keep irrelevant people ...

Page 10: ...ntial bonding This symbol is found with equipotential terminals inside equipment Indicates electrostatic discharge ESD This symbol is used in all electrostatic sensitive areas Before operating equipment in these areas wear ESD gloves or an ESD wrist strap Indicates that the equipment is safe to use at altitudes below 2000 m 6561 6 ft Indicates that the equipment is not safe to use in tropical clim...

Page 11: ...onals personnel who are trained or experienced in equipment operations and are clear of the sources and degree of various potential hazards in equipment installation operation and maintenance Trained personnel personnel who are technically trained have required experience are aware of possible hazards on themselves in certain operations and are able to take protective measures to minimize the haza...

Page 12: ...ower supply ensure that cable connections are correct If the equipment has multiple inputs disconnect all the inputs before operating the equipment Cabling When routing cables ensure that a distance of at least 30 mm exists between the cables and heat generating components or areas This prevents damage to the insulation layer of the cables Do not route cables behind the air intake and exhaust vent...

Page 13: ... secured and will not tilt or fall down due to loss of balance which can cause personal injury or equipment damage Do not expose the equipment to flammable or explosive gas or smoke Do not perform any operation on the equipment in such environments Installation at Heights Working at heights refers to operations that are performed at least 2 meters above the ground Do not at heights in any of the f...

Page 14: ...people to stay or pass under the area involving working at heights Inspect the scaffolding springboards and workbenches used for working at heights in advance to ensure that their structures are solid and not overloaded Dismantle the scaffolding from top down after finishing the job Do not dismantle the upper and lower layers at the same time When removing a part ensure that other parts will not c...

Page 15: ...opes are secured and the ladder is held firm Before using a ladder check that it is intact and confirm its load bearing capacity Do not overload it Ensure that the wider end of the ladder is at the bottom or protective measures have been taken at the bottom to prevent the ladder from sliding Ensure that the ladder is securely positioned The recommended angle for a ladder against the floor is 75 de...

Page 16: ...n drilling holes into a wall or floor observe the following safety precautions Do not drill holes into the equipment Doing so may affect the electromagnetic shielding of the equipment and damage components or cables inside Metal shavings from drilling may short circuit boards inside the equipment Wear goggles and protective gloves when drilling holes When drilling holes protect the equipment from ...

Page 17: ...atteries for example insert sundries into batteries or immerse batteries in water or other liquids When replacing a battery use a battery of the same model or type Improper replacement may cause the battery to explode Do not connect a metal conductor to the battery poles or touch the battery terminals Otherwise the battery may be short circuited and heat up which can cause injuries such as burning...

Page 18: ...te the polarities when installing batteries Do not short circuit the positive and negative poles of the same battery or battery string Otherwise the battery may be short circuited When installing a battery string retain at least one breakpoint to prevent a loop being formed After checking that the installation is correct close the breakpoints to finish the installation During the installation insu...

Page 19: ...whose electrolyte leaks note that the leaking electrolyte may hurt human bodies If the electrolyte overflows follow the instructions of the battery manufacturer or neutralize the electrolyte by using sodium bicarbonate NaHCO3 or sodium carbonate Na2CO3 Lithium Battery The safety precautions for lithium batteries are similar to those for lead acid batteries except that you also need to note the pre...

Page 20: ...00A D17A5 2 Telecom Power User Manual 1 Safety Precautions Issue 04 2019 12 20 Copyright Huawei Technologies Co Ltd 14 When maintenance is complete return the waste lithium battery to the maintenance office ...

Page 21: ...echnologies Co Ltd 15 2 Product Overview 2 1 Introduction The TP48200A D17A5 2 is an integrated telecom power system that supplies power to and backs up power for 48 V DC outdoor communications equipment It also provides space for installing the equipment Figure 2 1 shows the TP48200A D17A5 2 cabinet ...

Page 22: ...sign One fast Ethernet FE port and one RS485 RS232 port for network connections SNMP and HTTPS for communicating with HUAWEI Network Ecosystem NetEco and third party network management systems NMSs which ensures remote management and unattended operation Liquid crystal display LCD for display and buttons for user operations Web user interface WebUI for user operations Multiple display languages su...

Page 23: ... refer to indoor environments where temperature and humidity are controllable including rooms where human beings live Class B environments refer to indoor environments in which the ambient temperature and humidity are not controlled and outdoor environments with simple shielding measures where the humidity can reach 100 Class C environments refer to sea environments or outdoor land environments wi...

Page 24: ...TP48200A D17A5 2 Telecom Power User Manual 3 Components Issue 04 2019 12 20 Copyright Huawei Technologies Co Ltd 18 3 Components 3 1 Interior Figure 3 1 shows the TP48200A D17A5 2 interior ...

Page 25: ...t Huawei Technologies Co Ltd 19 Figure 3 1 Interior 1 T H sensor 2 Fan assembly 3 AC output box 4 Space for customer equipment 5 Ground bar 6 Battery antitheft baffle plates 7 Cable holes 8 Air filter 9 Battery temperature sensor 10 Ground bar 11 Light 12 Power subrack 13 Smoke sensor ...

Page 26: ...ations Figure 3 2 Power subrack without a cover 1 DC surge protective device SPD 2 AC SPD 3 AC input circuit breaker 4 BLVD circuit breakers 5 SMU02B 6 RTN busbar 7 Battery switch behind the cover 8 Battery circuit breakers 9 LLVD circuit breakers 10 UIM02C 11 Space for rectifiers Figure 3 3 AC output box 1 Residual current circuit breaker 2 Maintenance sockets Table 3 1 Power distribution specifi...

Page 27: ...ce sockets one residual protection circuit breaker DC power distribution BLVD route two 1 pole 10 A circuit breakers three 1 pole 16 A circuit breakers and one 1 pole 20 A circuit breaker LLVD route three 1 pole 20 A circuit breakers and five 1 pole 63 A circuit breakers Battery circuit breaker Two 1 pole 100 A circuit breakers 3 3 Fan Assembly The following figure shows the fan assembly Figure 3 ...

Page 28: ...d Blinking at 4 Hz The rectifier is loading an application program Alarm indicator Yellow Off No alarm is generated Steady on The rectifier generates an alarm for power limiting due to ambient overtemperature The rectifier generates an alarm for shutdown due to ambient overtemperature or undertemperature The rectifier protects against AC input overvoltage or undervoltage The rectifier is hibernati...

Page 29: ...icators Table 3 3 Indicator description Name Color Status Description Run indicator Green Off The SMU is faulty or has no DC input Blinking slowly 0 5 Hz The SMU is running properly and communicating with the host properly Blinking fast 4 Hz The SMU is running properly but fails to communicate with the host properly Minor alarm indicator Yellow Off No minor or warning alarm is generated Steady on ...

Page 30: ...ncrease or decrease a parameter value quickly hold down or To restart the SMU hold down and for 10 seconds To increase or decrease the LCD contrast ratio hold down and or for 2 seconds USB Ports You can quickly deploy a site import and export configuration files export running logs and upgrade software by inserting the USB flash drive that is specially used for site deployment into the USB port Af...

Page 31: ...400bit s 4800bit s 9600bit s 14400bit s 19200bit s 115200bit s Master slave protocol YDN protocol and Modbus protocol NOTE All these ports are protected by a security mechanism Figure 3 7 FE RS485 RS232 port pins Table 3 6 Pin definitions for the FE port Pin Signal Description 1 TX Transmits data over FE 2 TX 3 RX Receives data over FE 6 RX 4 5 7 8 NA Table 3 7 Pin definitions for the RS485 RS232 ...

Page 32: ...ke sensor input one water sensor input and one door status sensor input and four analog parameter inputs including one ambient temperature and humidity input two ambient temperature inputs and one battery temperature input Figure 3 8 shows a UIM02C panel Figure 3 8 UIM02C panel Ports Table 3 8 UIM02C ports Port Type Silk Screen Description Sensor ports TEM HUM Ambient temperature and humidity sens...

Page 33: ...ociations between the dry contact output ports and alarms see the appendix ALM2 ALM3 ALM4 ALM5 ALM6 ALM7 ALM8 Communications port COM RS485 port Communication Port Table 3 9 COM communication port description Communication Port Communications Parameter Communications Protocol Function COM port Baud rate 9600 bit s 19200 bit s 115200 bit s M S and Modbus protocols Connects to lower level devices su...

Page 34: ...Pins in the COM port Table 3 10 Pin definitions for the COM port Pin Signal Description 1 RX Receives data over RS485 2 RX 4 TX Sends data over RS485 5 TX 6 PGND Connects to the ground 3 7 8 None N A Pins Figure 3 10 shows the pin numbers of the sensor ports Table 3 11 provides the pin definitions Figure 3 10 UIM02C pin numbers ...

Page 35: ...ight Huawei Technologies Co Ltd 29 Table 3 11 UIM02C pin definitions Silkscreen No Pin Definitions TEM HUM 1 12 V 2 ENV_TEMP 3 12 V 4 ENV_HUM WATER 1 12 V 2 WATER 3 GND 4 Not defined TEMP1 1 GND 2 TEMP1 TEMP2 1 GND 2 TEMP2 GATE 1 GATE 2 GATE SMOKE 1 SMOKE 2 12 V BTEMP 1 GND 2 BTEMP ...

Page 36: ...Manual 3 Components Issue 04 2019 12 20 Copyright Huawei Technologies Co Ltd 30 3 7 Sensor and Lamp 3 7 1 Smoke Sensor Figure 3 11 Smoke sensor 1 1 Wiring port 2 Base 3 Indicator Figure 3 12 Smoke sensor 2 1 Wiring port 2 Base 3 Indicator ...

Page 37: ...om Power User Manual 3 Components Issue 04 2019 12 20 Copyright Huawei Technologies Co Ltd 31 3 7 2 Temperature and Humidity Sensor Figure 3 13 Temperature and Humidity Sensor 1 Figure 3 14 Temperature and Humidity Sensor 2 ...

Page 38: ... D17A5 2 Telecom Power User Manual 3 Components Issue 04 2019 12 20 Copyright Huawei Technologies Co Ltd 32 3 7 3 Battery Temperature Sensor Figure 3 15 Battery temperature sensor 3 7 4 Light Figure 3 16 Light ...

Page 39: ...t maintenance No Maintenance Item If Then 1 Check whether the cabinet paint is flaking off or there are scratches on the cabinet surface The cabinet is scratched Repaint the cabinet 2 Check whether the cabinet is rusty or corroded The environment quality of the equipment room is poor Evaluate the risk and improve the environment of the equipment room 3 Check whether the cabinet door lock is damage...

Page 40: ...the power supplier 4 Check for AC input overvoltage The mains voltage is too high Provide the voltage data to the power supplier 5 Check whether the AC input voltage is open phase AC input power cables are in poor contact short circuited or damaged The mains supply has failed 1 Check and rectify the cables 2 Provide the open phase data to the power supplier 6 Check whether a DC output circuit brea...

Page 41: ...ean the cabinet air channel 2 Rectify faults in the indoor temperature control system 3 Check the AC input voltage 4 The rectifier is in hibernation No action is required Blinking The rectifier communication has failed The rectifier is faulty 1 Check that the rectifier communications cable is securely connected 2 Replace the rectifier 3 Check the red indicator status normal off Steady on The recti...

Page 42: ...ame as the actual data Parameters are set incorrectly The number of batteries is changed or batteries are replaced Set battery parameters again 2 Check Charge Current Limit Coefficient The value is typically 0 15C10 and adjustable N A Change the value as required Otherwise retain 0 15C10 3 Check whether the displayed battery temperature is the same as the actual temperature The battery temperature...

Page 43: ...4 Check whether the cabinet ground bar is securely connected to the site or equipment room ground point Cables are not properly installed Connect the cabinet ground bar to the site or equipment room ground point 5 Check whether ground cables are rusty Cables corrode after being used for a long time Replace rusty cables 6 Check whether the DC RTN busbar is grounded Cables are not properly installed...

Page 44: ...cator red is steady on or all indicators are off The slot connector and SMU are normal but the Alarm indicator yellow still blinks after the rectifier is reinstalled The AC input and SMU are normal but the SMU cannot control the rectifier 4 2 4 Identifying SMU Faults The following lists the SMU faults The DC output is normal but the green indicator on the SMU is off The SMU breaks down or cannot b...

Page 45: ...door key The new rectifier is intact Protect yourself from being burnt when moving the rectifier because the rectifier has a high temperature Procedure Step 1 Put on protective gloves Step 2 Push the locking latch at the right side of the panel towards the left Step 3 Gently draw the handle outwards and then remove the rectifier from the subrack as shown in Figure 4 1 Figure 4 1 Removing a rectifi...

Page 46: ...3 2 Replacing an AC SPD Prerequisites You have prepared an ESD wrist strap a pair of ESD gloves an ESD box or bag and the cabinet door key The new AC SPD is intact and the indication window is green Do not replace the AC SPD during a thunderstorm Procedure Step 1 Connect the ground cable to the ESD wrist strap and put on the ESD wrist strap and ESD gloves Step 2 Hold the faulty AC SPD and pull it ...

Page 47: ...he upper level device The cabinet door key insulation tape and required tools are available The new circuit breaker is intact and has the same specifications as the original one Procedure Step 1 Unscrew and remove the cover before the circuit breaker Step 2 Switch off the circuit breaker that is to be replaced Step 3 Record positions where the cables and signal cable terminals connect to the circu...

Page 48: ...breaker Press the buckle at the circuit breaker base by using an insulated flat head screwdriver and install the new circuit breaker Then loosen the buckle and secure the circuit breaker to the guide rail Step 8 Tighten the screw that secures the lower port of the circuit breaker Step 9 Remove the insulation tape from the output power cable and signal cable terminals Then connect the power cable a...

Page 49: ...the handle outwards and remove the SMU as shown in Figure 4 6 Figure 4 6 Removing an SMU Step 3 Insert the new SMU into the subrack push the locking latch towards the left and pull out the handle Step 4 Slide the SMU into the subrack slowly along the guide rail push in the handle and then push the locking latch towards the right Step 5 Reset parameters on the SMU Figure 4 7 Installing an SMU End F...

Page 50: ...ted circuit board PCB of UIM02C is intact Procedure Step 1 Connect the ground cable to the ESD wrist strap and wear the ESD wrist strap and ESD gloves Step 2 Record the positions on the UIM02C panel for connecting signal cables and disconnect the cables Step 3 Unscrew the UIM02C panel and remove the UIM02C as shown in Figure 4 8 Figure 4 8 Taking out the UIM02C Step 4 Record the positions where th...

Page 51: ...ct the ground cable from the ESD wrist strap and remove the ESD wrist strap or ESD gloves End Follow up Procedure Pack the removed component and return it to Huawei local warehouse 4 3 6 Replacing the Fan in the Fan Assembly Prerequisites You have prepared an ESD wrist strap a pair of ESD gloves an ESD box or bag the cabinet door key and the tool kit The new fan is intact Context You need only to ...

Page 52: ...s shown in Figure 4 8 Step 3 Take out the fan assembly 1 Record the positions where cables connect to the fan assembly and then disconnect the cables 2 Unscrew and take out the fan assembly as shown in Figure 4 10 Figure 4 10 Taking out the fan assembly Step 4 Remove the fan 1 Unscrew and remove the cover from the fan assembly 2 Unscrew the fan fixing plate and remove the plate from the fan as sho...

Page 53: ...ing plate from the fan Figure 4 12 Removing a fan Step 5 Install the new fan 1 Properly place the fan into the fan assembly and tighten the screws for the fan 2 Tighten the screws that secure the fan fixing plate 3 Tighten the screws that secure the cover Step 6 Install the fan assembly 1 Push the fan assembly into the fan assembly slot and tighten the screws ...

Page 54: ...uisites You have obtained an ESD wrist strap a pair of ESD gloves an ESD box or bag the cabinet door key and tools The new TCUC control board is intact Context You need only to disconnect the power supply to the TCUC instead of the AC input to the power system Procedure Step 1 Connect the ground cable to the ESD wrist strap and put on the ESD wrist strap and ESD gloves Step 2 Disconnect the power ...

Page 55: ...e 04 2019 12 20 Copyright Huawei Technologies Co Ltd 49 Figure 4 13 Removing the fan assembly Step 4 Unscrew and remove the cover from the fan assembly Step 5 Unscrew and remove the fan fixing plate Figure 4 14 Removing the fan assembly cover and fan fixing plate ...

Page 56: ... board Step 8 Record the positions of jumper caps on the TCUC control board Step 9 Install the new TCUC control board 1 Set jumper caps for the new TCUC control board based on the recorded information Figure 4 16 Jumper cap information 2 Install the new TCUC control board in the TCUC Step 10 Install the TCUC Step 11 Install the fan assembly cover and fan fixing plate Step 12 Install the fan assemb...

Page 57: ... Procedure Pack the removed component and return it to the local Huawei warehouse 4 3 8 Replacing an Air Filter Prerequisites You have prepared an ESD wrist strap a pair of ESD gloves the cabinet door key and the tool kit The new air filter is intact Context The air filter can be directly replaced without the need to disconnect the AC input to the system Procedure Step 1 Connect the ground cable t...

Page 58: ... cable from the ESD wrist strap and take off the ESD wrist strap and ESD gloves End 4 3 9 Replacing a Smoke Sensor Prerequisites An ESD wrist strap ESD gloves ESD box or bag cabinet door key and required tools are available The new smoke sensor is intact Procedure Step 1 Connect the ground cable to the ESD wrist strap and put on the ESD wrist strap and ESD gloves Step 2 Remove the smoke sensor as ...

Page 59: ...ed in the same manner Figure 4 18 Removing the smoke sensor Step 3 Install the new smoke sensor 1 Place the smoke sensor base correctly and tighten the screws for it 2 Place the new smoke sensor correctly and press and push it in the CLOSE direction 3 Reconnect the removed cables to the smoke sensor Step 4 Disconnect the ground cable from the ESD wrist strap and remove the ESD wrist strap and ESD ...

Page 60: ...n ESD box or bag the cabinet door key and a tool kit The new battery temperature sensor is intact Procedure Step 1 Connect the ground cable to the ESD wrist strap and put on the ESD wrist strap and ESD gloves Step 2 Remove the battery temperature sensor cable from the UIM as shown in Figure 4 19 Figure 4 19 Removing a battery temperature sensor cable Step 3 Cut off the cable tie of the battery tem...

Page 61: ...ure 4 20 Position of a battery temperature sensor Step 4 Properly place the new battery temperature sensor and bind it securely with a cable tie Step 5 Reconnect the battery temperature sensor cable to the UIM Step 6 Disconnect the ground cable from the ESD wrist strap and take off the ESD wrist strap and ESD gloves End ...

Page 62: ... 0 4000 m When the altitude ranges from 2000 m to 4000 m the operating temperature decreases by 1 C for each additional 200 m Noise level GR487 acoustic pressure level 65 dBA at 1 5 m Heat dissipation capacity 1400 W Other requirements There should be no conductive dust corrosive gas or explosion hazard Dust corrosive substances pests molds and other indicators should be controlled in accordance w...

Page 63: ...tage protection threshold 300 V AC AC input overvoltage recovery threshold When the voltage is restored to 290 V AC the output resumes AC input undervoltage protection threshold 85 V AC AC input undervoltage recovery threshold When the voltage is restored to 90 V AC the output resumes DC output protection DC output overvoltage protection threshold 58 5 V DC to 60 5 V DC 1 If overvoltage occurs ins...

Page 64: ...t 2 kV DC power port 2 kV signal port 1 kV Radiated susceptibility RS EN61000 4 3 criterion A 10 V m Conducted susceptibility CS EN61000 4 6 criterion A AC and DC power ports 10 V signal port 3 V Surge susceptibility EN61000 4 5 criterion B AC power port 2 kV in differential mode 4 kV in common mode 8 20 µ s DC power port 2 kV in differential mode 4 kV in common mode 8 20 µ s Signal port 0 5 kV in...

Page 65: ...8200A D17A5 2 Telecom Power User Manual B Electrical Conceptual Diagram Issue 04 2019 12 20 Copyright Huawei Technologies Co Ltd 59 B Electrical Conceptual Diagram Figure B 1 Electrical conceptual diagram ...

Page 66: ...ct input 1 DIN2 Dry contact input 2 DIN3 Dry contact input 3 DIN4 Dry contact input 4 DIN5 Dry contact input 5 DIN6 Dry contact input 6 Dry contact output ports The default setting closed alarm open normal can be modified ALM1 High battery temperature high ambient temperature TCU alarm Rectifier fault rectifier communication failure ALM2 Door status alarm ALM3 Battery fuse blown Multi rectifier fa...

Page 67: ...breviations B BLVD Battery low voltage disconnection E EMC Electromagnetic compatibility EMI Electromagnetic interference EMS Electromagnetic susceptibility H HTTPS Hypertext Transfer Protocol Secure L LLVD Load low voltage disconnection I IEC International Electrotechnical Commission M MTBF Mean time between failures P PDU power distribution unit S ...

Page 68: ...Power User Manual D Acronyms and Abbreviations Issue 04 2019 12 20 Copyright Huawei Technologies Co Ltd 62 SMU Site monitoring unit SNMP Simple Network Management Protocol SPD Surge protection device U UIM user interface module ...

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