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TP48200A-DX12A1 Telecom Power
User Manual

3 Components

Issue 07 (2019-11-15)

Copyright © Huawei Technologies Co., Ltd.

20

Figure 3-2

Power subrack on TP48200A-DX12A1 (DC2)

(1) SMU02B

(2) Space for NIM01C

(3) Space for rectifiers

(4) UIM02C

(5) Battery circuit breaker

(6) Battery switch
(behind the cover)

(7) BLVD circuit
breakers

(8) Load low voltage disconnection
(LLVD) circuit breakers

(9) RTN+ busbar

(10) AC input
transfer switch

(11) AC surge protective device (SPD)

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Содержание Telecom Power TP48200A-DX12A1

Страница 1: ...TP48200A DX12A1 Telecom Power User Manual Issue 07 Date 2019 11 15 HUAWEI TECHNOLOGIES CO LTD ...

Страница 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...

Страница 3: ...ription 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 re...

Страница 4: ...ized the content about rectifiers Issue 06 2019 02 26 Optimized the content of the document Issue 05 2017 03 20 Modified appendix A 3 EMC Specifications Issue 04 2016 02 05 Modified all the cabinet figures Issue 03 2016 01 12 Modified appendix C Associations Between Alarms and Dry Contacts on the UIM Issue 02 2015 11 24 Modified all the cabinet figures Modified section 2 3 System Configurations Mo...

Страница 5: ...rview 15 2 1 Introduction 15 2 2 Features 16 2 3 System Configurations 16 3 Components 18 3 1 Interior 18 3 2 Power Distribution Unit 22 3 3 Rectifier 22 3 4 SMU02B 23 3 5 User Interface Module UIM02C 27 3 6 Optional Heater 30 3 7 Door Status Sensor 31 3 8 Battery Temperature Sensor 31 4 Maintenance 32 4 1 Routine Maintenance 32 4 2 Rectifying Common Faults 33 4 2 1 AC Failure 33 4 2 2 AC Over Vol...

Страница 6: ...ntifying SMU Faults 40 4 4 Replacing Components 40 4 4 1 Replacing a Rectifier 41 4 4 2 Replacing a Circuit Breaker 42 4 4 3 Replacing a Plug in Circuit Breaker 43 4 4 4 Replacing the PCB of UIM02C 44 4 4 5 Replacing an SMU 46 4 4 6 Replacing an AC SPD Module 47 4 4 7 Replacing a Direct Ventilation Fan 48 4 4 8 Replacing an Air Filter 49 4 4 9 Replacing a Heater 50 4 4 10 Replacing a Battery Tempe...

Страница 7: ...ge 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 ar...

Страница 8: ...gure 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 inst...

Страница 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 a...

Страница 10: ...tial 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 clima...

Страница 11: ...nals 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 hazar...

Страница 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...

Страница 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...

Страница 14: ...eople 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 co...

Страница 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...

Страница 16: ... 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 s...

Страница 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...

Страница 18: ...e 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 insul...

Страница 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...

Страница 20: ...200A DX12A1 Telecom Power User Manual 1 Safety Precautions Issue 07 2019 11 15 Copyright Huawei Technologies Co Ltd 14 When maintenance is complete return the waste lithium battery to the maintenance office ...

Страница 21: ...Technologies Co Ltd 15 2 Overview 2 1 Introduction The TP48200A DX12A1 DC2 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 TP48200A DX12A1 DC2 exterior ...

Страница 22: ...Multiple display languages such as English Chinese Italian French Spanish Portuguese Russian German and Turkish Hot swappable rectifiers and site monitoring unit SMU Rectifier power factor PF of 0 99 2 3 System Configurations Table 2 1 Power cabinet configurations Item TP48200A DX12A1 DC2 Input system 220 380 V AC three phase dual inputs AC input and emergency AC input Surge protection Type 1 Type...

Страница 23: ...ch 100 Class C environments refer to sea environments or outdoor land environments with simple shielding measures near pollution sources If a site is near a pollution source it is at most 3 7 km away from salt water such as the sea and salt lakes 3 km away from heavy pollution sources such as smelteries coal mines and thermal power plants 2 km away from medium pollution sources such as chemical ru...

Страница 24: ...TP48200A DX12A1 Telecom Power User Manual 3 Components Issue 07 2019 11 15 Copyright Huawei Technologies Co Ltd 18 3 Components 3 1 Interior Figure 3 1 TP48200A DX12A1 DC2 interior ...

Страница 25: ...19 11 15 Copyright Huawei Technologies Co Ltd 19 1 RTN busbar 2 AC output unit 3 AC input unit 4 Cabinet ground bar 5 Heater optional 6 Heater standard 7 Air filter 8 Folder 9 Direct ventilation fan 10 Battery low voltage disconnection BLVD output box 11 Power subrack ...

Страница 26: ...gure 3 2 Power subrack on TP48200A DX12A1 DC2 1 SMU02B 2 Space for NIM01C 3 Space for rectifiers 4 UIM02C 5 Battery circuit breaker 6 Battery switch behind the cover 7 BLVD circuit breakers 8 Load low voltage disconnection LLVD circuit breakers 9 RTN busbar 10 AC input transfer switch 11 AC surge protective device SPD ...

Страница 27: ...n TP48200A DX12A1 DC2 1 German standard maintenance socket and protective circuit breaker 2 AC light power terminals and time relay 3 AC input circuit breaker and terminals 4 PE terminal 5 AC output circuit breaker and terminal 6 Emergency AC input circuit breaker and terminals Figure 3 4 DC output box on TP48200A DX12A1 DC2 1 BLVD circuit breakers ...

Страница 28: ...CD one 1 pole 10 A circuit breaker and AC light power terminals and one time relay 5 A resistive load or 1 A capacitive load DC power distribution BLVD circuit breakers 2x32 A 1P 2x20 A 1P 2x16 A 1P 2x10 A 1P 2x6 A 1P LLVD circuit breakers 3x63 A 1P Battery route One 2 pole 125 A circuit breaker 3 3 Rectifier Rectifiers convert AC input into stable DC output Figure 3 5 Rectifier 1 Run indicator 2 ...

Страница 29: ... alarm due to ambient overtemperature The rectifier has generated an alarm for shutdown due to ambient overtemperature or undertemperature The rectifier is protecting itself against AC input overvoltage or undervoltage The rectifier is hibernating Blinking at 0 5 Hz The communication between the rectifier and the SMU has been interrupted Fault indicator Red Off The rectifier is running properly St...

Страница 30: ... 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 A minor or warning alarm is generated Major alarm indicator Red Off No critical or major alarm is generated Steady on A critical or major alarm is generated Buttons Table 3 4 Button description Button Name Description Up P...

Страница 31: ...re by inserting the USB flash drive that is specially used for site deployment into the USB port After installing the specific WiFi module using the USB port you can access the WebUI locally which facilitates operations Using WiFi modules provided by another vendor may cause data loss or function exception Consequences arising from this will not be borne by Huawei Communications Ports Table 3 5 Co...

Страница 32: ...initions 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 port Pin Signal Description 1 TX Transmits data over RS485 2 TX 4 RX Receives data over RS485 5 RX 3 RX232 Receives data over RS232 7 TX232 Transmits data over RS232 6 PGND Connects to the ground 8 NA ...

Страница 33: ...or input and one battery temperature input Figure 3 8 UIM02C panel Ports Table 3 8 UIM02C ports Port Type Silk Screen Description Sensor ports TEM HUM Ambient temperature and humidity sensor WATER Water sensor TEMP1 Ambient temperature sensor 1 TEMP2 Ambient temperature sensor 2 GATE Door status sensor SMOKE Smoke sensor BTEMP Battery temperature sensor Dry contact input ports DIN1 NOTE For the as...

Страница 34: ...cations Port Communications Parameter Communications Protocol Function COM port Baud rate 9600 bit s 19 200 bit s 115 200 bit s Master slave protocols and Modbus Connects to a lower level device such as the battery voltage detector or intelligent air conditioner NOTE The COM port is protected by a security mechanism Figure 3 9 Pins in the COM port Table 3 10 Pin definitions for the COM port Pin Si...

Страница 35: ...Ltd 29 Pin Signal Description 5 TX 6 PGND Protective grounding 3 7 and 8 Reserved N A Pins Figure 3 10 UIM02C pin numbers Table 3 11 UIM02C pin definitions Silk Screen No Pin Definition 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 ...

Страница 36: ... V BTEMP 1 GND 2 BTEMP 3 6 Optional Heater A heater assembly unit HAU is adopted to ensure a proper operating temperature for the equipment inside the cabinet Figure 3 11 Heater 1 Indicator 2 Alarm dry contact 3 Control dry contact 4 AC input port Table 3 12 Indicator description Silk Screen Color Status Description RUN Green Steady on The heater is powered on and takes a self test ...

Страница 37: ...1 Silk Screen Color Status Description Off The heater is not powered on ALM Red Off No alarm is generated Steady on An alarm is generated and the heater needs to be replaced 3 7 Door Status Sensor Figure 3 12 Door status sensor 1 Switch 2 Magnet 3 8 Battery Temperature Sensor Figure 3 13 Battery temperature sensor ...

Страница 38: ...tes on the fan Clean the dust The fan is intact and the rotation speed noise and vibration are in normal ranges By observing or listening to the fan The fan is damaged the vibration is abnormal or the noise is loud Replace the fan TCUC control board The TCUC control board works properly By observation or by checking the indicator and alarms The TCUC control board does not work properly Replace the...

Страница 39: ... 2 Rectifying Common Faults 4 2 1 AC Failure Possible Causes The AC input power cable is faulty The AC input circuit breaker is OFF The power grid is faulty Measures 1 Check whether the AC input cable is loose If so secure the AC input cable 2 Check whether the AC input circuit breaker is OFF If so handle the fault which caused the AC input circuit breaker to turn OFF and then switch on the circui...

Страница 40: ...not set the threshold to the correct value 2 Check whether the system voltage has been manually set to a very high value If so check with other maintenance personnel whether the voltage can be changed to a normal value 3 Remove the rectifiers one by one and check whether the alarm is cleared If the alarm still exists reinstall the rectifier If the alarm is cleared replace the rectifier 4 2 5 DC Un...

Страница 41: ...reinstall it and check whether the alarm is cleared If the alarm still exists replace the SMU 4 2 7 LLVD Disconnected Possible Causes An AC power failure has occurred Loads are manually disconnected The load disconnection voltage has been set to a very high value on the SMU Measures 1 Check whether an AC power failure has occurred If so rectify the fault to restore the AC power supply 2 Check whet...

Страница 42: ...fuse 3 Manually switch on or switch off the battery contactor and check whether the battery current changes accordingly If not replace the contactor 4 2 10 Batt High Temp This alarm is generated only for the power system that has a battery temperature sensor installed Possible Causes The high battery temperature alarm threshold is incorrectly set The battery temperature control system is faulty Th...

Страница 43: ...nsor installed Possible Causes The cabinet doors are open The door status sensor is faulty Measures 1 Close cabinet doors 2 Check whether the door status sensor is faulty If yes replace the door status sensor 4 2 13 Rectifier Missing Possible Causes Rectifiers are not powered on Rectifiers are faulty The subrack or slot connectors are faulty The SMU is faulty Measures 1 Check whether rectifier cir...

Страница 44: ...ctors are faulty Rectifiers are faulty The SMU is faulty Measures 1 Remove the rectifiers and check whether the slot connectors are damaged or deformed If so repair or replace the slot connectors or the entire subrack 2 Reinstall the rectifiers If the alarm persists replace the rectifiers 3 Restart the SMU If the alarm persists replace the SMU 4 2 16 Rect Fault Possible Causes Rectifier connection...

Страница 45: ...er the indicator turns off If the alarm persists replace the rectifier 4 2 18 Rect Comm Fault Possible Causes A rectifier has been removed Rectifier connections are loose A rectifier is faulty Measures 1 Check whether a rectifier has been removed If so reinstall it 2 If the rectifier is in position remove the rectifier and reinstall it 3 If the alarm persists replace the rectifier 4 2 19 DC SPD Fa...

Страница 46: ...ow indicator is blinking the red indicator is off and the rectifier output is normal The SMU can perform equalized charging float charging and current limiting control for the rectifier when the communication cable to the rectifier is correctly connected and communication is established between the rectifier and the SMU 4 3 3 Identifying SMU Faults The following indicate that the SMU is faulty The...

Страница 47: ...otective gloves and the cabinet door key are available The new rectifier is intact To prevent burns exercise caution when removing a rectifier because the rectifier may be hot as a result of continuous operation Procedure Step 1 Wear protective gloves Step 2 Push the locking latch on the right side of the panel towards the left Step 3 Gently draw the handle outwards and then remove the rectifier f...

Страница 48: ...ntact has the same specifications and is OFF 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 connection positions of output cables Step 4 Loosen the screws that secure ports on the circuit breaker using a Phillips screwdriver and remove the cables Wrap the cables using insulation tapes to prevent ha...

Страница 49: ...re 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 tapes from the output cables Then connect the output cables to the circuit breaker ports and tighten the screws Step 10 Switch the circuit breaker to ON as shown in Figure 4 4 Figure 4 4 Installing a circuit breaker Step 11 Reinstall the cover and tighte...

Страница 50: ...position Step 4 Switch on the new circuit breaker Step 5 Tighten the screws and install the front cover on the circuit breaker End 4 4 4 Replacing the PCB of UIM02C Prerequisites An ESD wrist strap ESD gloves ESD box or bag cabinet door key and required tools are available The new printed circuit board PCB of UIM02C is intact Procedure Step 1 Connect the ground cable of the ESD wrist strap and wea...

Страница 51: ...logies Co Ltd 45 Figure 4 6 Removing the UIM02C Step 4 Remove the 48 V power cable from the PCB of UIM02C Figure 4 7 Removing the 48 V power cable Step 5 Record the positions where the PCB of UIM02C connects to all the cables and then disconnect the cables Step 6 Remove the PCB as shown in Figure 4 8 ...

Страница 52: ...in the UIM02C and tighten the screws Step 11 Reconnect the signal cables to the UIM02C panel based on the recorded information Step 12 Disconnect the ground cable of the ESD wrist strap and remove the ESD wrist strap and ESD gloves End Follow up Procedure Pack the removed component and send it to the local Huawei warehouse 4 4 5 Replacing an SMU Prerequisites The cabinet door key is available The ...

Страница 53: ...atch towards the right Step 5 Reset the parameters on the SMU Figure 4 10 Installing an SMU End Follow up Procedure Pack the removed component and send it to the local Huawei warehouse 4 4 6 Replacing an AC SPD Module Prerequisites You have obtained an ESD wrist strap or a pair of ESD gloves an ESD box or bag and the cabinet door key The new AC SPD module is intact and the indication window is gre...

Страница 54: ...PD is cleared 4 4 7 Replacing a Direct Ventilation Fan Prerequisites 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 fan is intact Install the fan according to airflow directions Do not install the fan reversely Context You need only to disconnect the fan power cable but not the AC input to the system Procedure Step 1 Disconnect th...

Страница 55: ... Install the new fan according to the fan installation direction you recorded Step 5 Reconnect the interconnection terminal to the fan power cable Step 6 Reinstall the UIM02C 1 Connect the 48 V power cable to the UIM02C 2 Insert the UIM02C into the correct slot and tighten the screws 3 Reconnect the signal cables to the UIM02C based on the recorded information 4 Disconnect the ground cable from th...

Страница 56: ...an air filter Step 2 Correctly place the new air filter keep the side with a label upwards and the surface with a rubber strip facing the cabinet door Tighten the screws to secure the air filter End 4 4 9 Replacing a Heater Prerequisites You have prepared an ESD wrist strap a pair of ESD gloves the cabinet door key and tools The new heater is intact Before replacing the heater ensure that its circ...

Страница 57: ...based on the recorded information Step 6 Place the new heater in position and tighten the screws Step 7 Switch on the heater circuit breaker on the AC PDU Step 8 Disconnect the ground cable from the ESD wrist strap and take off the ESD wrist strap and ESD gloves End 4 4 10 Replacing a Battery Temperature Sensor Prerequisites You have obtained an ESD wrist strap a pair of ESD gloves an ESD box or b...

Страница 58: ...gure 4 15 Removing the battery temperature sensor cable Step 3 Cut off the cable tie of the battery temperature sensor and remove the sensor The detection probe must not contact a metal surface Figure 4 16 Position of the 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...

Страница 59: ...l of the door status sensor Step 2 Record the positions where the alarm cables connect to the door status sensor and unscrew the alarm cables Step 3 Unscrew the door status sensor as shown in Figure 4 17 Figure 4 17 Removing the door status sensor Step 4 Remove the shell of the new door status sensor and remove the screws from the alarm cables Step 5 Properly place the new door status sensor at th...

Страница 60: ... 70º C Operating humidity 5 95 RH Storage humidity 5 95 RH Altitude 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 Others There should be no conductive dust corrosive gas or explosion hazard Dust corrosive substances pests molds and other indicators should be controlled in accordance with class 4 1 requirements in ETSI E...

Страница 61: ...ent imbalance 5 50 100 load AC input protection AC input overvoltage 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 protect...

Страница 62: ...t transient EFT IEC61000 4 4 criterion B AC power port 2 kV DC power port 1 kV signal port 1 kV Radiated susceptibility RS IEC61000 4 3 criterion A 10 V m Conducted susceptibility CS IEC6100 4 6 criterion A Power port 10 V signal port 3 V Surge immunity IEC61000 4 5 criterion B AC power port differential mode 2 kV 8 20 µs common mode 4 kV 8 20 µs DC power port differential mode 2 kV 8 20 µs common...

Страница 63: ... Routed in and out from the bottom A 5 Heater Specifications Table A 5 Heater specifications Item Specifications Input voltage 220 V AC single phase or 110 V AC dual live wire Voltage frequency Rated frequency 50 Hz or 60 Hz Operating temperature 40 C to 65 C 40 F to 149 F Heater start and stop temperature The heater starts when the temperature is 0 C and stops when the temperature is 15 C Operati...

Страница 64: ...A1 Telecom Power User Manual B Electrical Conceptual Diagrams Issue 07 2019 11 15 Copyright Huawei Technologies Co Ltd 58 B Electrical Conceptual Diagrams Figure B 1 TP48200A DX12A1 DC2 electrical conceptual diagram ...

Страница 65: ...sed alarm DIN4 Dry contact input 4 open normal closed alarm DIN5 Heater Fault closed normal open alarm DIN6 Dry contact input 6 open normal closed alarm Dry contact output ports The default setting closed normal open alarm can be modified ALM1 Urgent alarm System incident BLVD Warning BLVD Disconnected Batt Fuse Break SMU Fault Batt Test Negative Rectifier Fault DC Undervolt DC Ultra Undervolt ALM...

Страница 66: ...nd Dry Contacts on the UIM Issue 07 2019 11 15 Copyright Huawei Technologies Co Ltd 60 Port Type Silk Screen Name Category Associated Alarm ALM7 Temperature alarm High low temperature Batt High Temp Batt Low Temp High temp Heater Fault ALM8 Door contact Door open Door Alarm ...

Страница 67: ...echnologies Co Ltd 61 D Acronyms and Abbreviations A AC alternating current B BLVD battery low voltage disconnection D DC direct current F FE fast ethernet H HAU heater assembly unit HTTPS Hypertext Transfer Protocol Secure I IP Internet Protocol L LCD liquid crystal display LLVD load low voltage disconnection ...

Страница 68: ... User Manual D Acronyms and Abbreviations Issue 07 2019 11 15 Copyright Huawei Technologies Co Ltd 62 S SMU site monitoring unit SNMP Simple Network Management Protocol T TCUC Temperature control unit C U UIM user interface module ...

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