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Huawei H20-681-ENU Exam Syllabus Topics:

Huawei Certified Field Specialist -Smart PV Controller Sample Questions:

1. In the photovoltaic engineering project, the handling, storage, installation and commissioning process of Huawei inverters must be carried out in strict accordance with the specifications to avoid equipment damage or personnel damage. The following statement which is correct? (Multiple choice)

A) The project storage and installation of the inverter must ensure the surrounding environment is safe and away from the surrounding flammable and explosive environment.
B) After the inverter is turned off, there is still residual power and residual heat in the chassis, which may cause electric shock or burns. Therefore, please operate the inverter after the inverter is turned off for 5 minutes.
C) During the process of transporting or storing the inverter on site, the power cable interface and signal cable interface at the bottom of the inverter cannot be loaded. Do not directly connect the terminal to the ground. The inverter must be placed horizontally.
D) To prevent dust from entering the human respiratory tract or falling into the eye during the installation of the inverter, the operator should wear protective glasses and dust masks.

2. When the Huawei SUN2000L household inverter is powered on, first close the external power distribution AC switch, then close the DC switch on the inverter, and finally close the external DC switch.

A) False
B) True

3. Huawei PID module alarm ID: 1921 (grounding abnormal), the possible reason is (). (Multiple Choice)

A) The box corresponding to the PID module is changed to N-line grounding.
B) Poor contact of the PID module output ground
C) PID module output ground is not connected
D) PID module hardware failure

4. Which of the following description about the operation of the software are correct? (Multiple choice)

A) Develop a system fallback mechanism. If unexpected results are produced, start the system fallback mechanism as soon as possible, end the work, and re-enact the implementation plan.
B) Before performing important software operation tasks, you need to submit a software operation application and get approval of the customer and Huawei service manager.
C) Whenever the equipment/system is found to be operating abnormally, it is necessary to communicate with the equipment supplier or relevant responsible person in time to detect or prevent the failure as soon as possible.
D) After the on-site operation is completed, the customer site logbook must be updated in a timely manner.

5. The following are island hazards (). (Multiple Choice)

A) When the voltage phase is not synchronized when the power is restored, it will generate a surge current, which may cause another trip or damage to the PV system, load and power supply system.
B) Endangering the safety of electric maintenance personnel
C) The unstable nature of the supply voltage and frequency that occurs in the isolated island area can cause damage to the electrical equipment.
D) Affect the protection switch action program on the power distribution system

Solutions: