What Does a Fire Adjuster Do?

Fire control equipment: In the automatic fire alarm system, after receiving the fire alarm fire control center signal from the triggering device, the equipment that can automatically or manually start the relevant fire equipment and display its status is called fire control equipment.

Fire control equipment

mainly include

The fire control center alarm system refers to the

Fire prevention measures should be taken in the building design to prevent fires and reduce the danger of fire and life and property. Building fire prevention includes two aspects: fire prevention and fire prevention measures. The former is mainly to determine the fire resistance level and structure, to control the amount of combustible materials and to separate the parts that are liable to fire. The latter is mainly to partition the fire, set up evacuation facilities and exhaust. Smoke, fire extinguishing equipment, etc.

I. Fire protection equipment and equipment According to the divided management area, the principle of "who is in charge and who is responsible" is implemented, so that the fire protection equipment and equipment are always in a good standby state.

2. The Ministry of Fire Safety conducts regular inspections, clearances and registrations of fire protection facilities and equipment twice a year.

three,

The fire control center is to grasp the dynamics of fire equipment and find fires,

1. The fire control systems in this management area are remote control and interlocking automatic devices, so you must observe whether each system is set to the automatic position before operation.

Second, first observe whether the power signal of each system is normal.

Third, the safe operation method of each system is as follows:

1. Smoke detection system: When a fire alarm occurs, after confirming the floor, first notify the security personnel to go to the alarm floor to observe, and get in touch with the personnel on this floor in time. If it is a fire danger, immediately follow the fire fighting plan. If it is a false alarm, ask the security personnel to reset the area alarm, and then reset the centralized alarm in the duty room.

2. Fire shutter door system: When a fire occurs in a group of buildings, according to the location of the fire and the size of the fire, the isolation method can be adopted, and the corresponding fire shutter door can be dropped. Landing. If neither of the above two situations can be landed (observe the rolling shutter landing signal light), you can quickly send fire maintenance personnel to open the key switch to force the landing.

3. Smoke exhaust system: When a fire occurs, the attendant remotely opens the smoke exhaust valve of this floor and its upper and lower floors. If it is out of control, notify the personnel to open the smoke exhaust valve on this floor in place. This is the automatic start of the smoke exhaust fan and the start signal light is on. If the fan cannot be started automatically, the speed will be turned into the manual position to start, and when the fan still cannot be started, the speed will be sent to the fan room to start forcibly.

4. Pressurized air supply system: According to different directions of the fire, quickly turn on the corresponding pressurized fan, the start signal light is on, if it is out of control, you can send someone to the fan room for manual operation.

(Motors) is

The inverter is a device that converts a commercial frequency power supply (50Hz or 60Hz) into AC power of various frequencies to achieve variable speed operation of the motor. The control circuit completes the control of the main circuit, the rectifier circuit converts the AC power into DC power, the DC intermediate circuit smoothes the output of the rectifier circuit, and the inverter circuit converts the DC power back into AC power. For inverters that require a lot of calculations, such as vector-controlled inverters, sometimes a CPU for torque calculation and some corresponding circuits are required.

1. Rectifier, which is connected to a single-phase or three-phase AC power source to generate a pulsating DC voltage.

2. The intermediate circuit has the following three functions:

a. Make the pulsating DC voltage stable or smooth for inverter use.

b. Power the various control lines through the switching power supply.

c. Filtering or braking device can be configured to improve the performance of the inverter.

3. Inverter converts a fixed DC voltage into an AC voltage with variable voltage and frequency.

4. Control circuit, which transmits signals to rectifier, intermediate circuit and inverter, and it also receives signals from these parts. Its main components are: output drive circuit and operation control circuit. The main functions are:

a. Use the signal to switch the semiconductor devices of the inverter.

b. Provide various control signals for operating the inverter.

c. Monitor the working status of the inverter and provide protection.

If the operators who operate the inverter and the surrounding control devices on the site can judge and deal with some common fault situations, they can greatly improve their work efficiency and avoid unnecessary losses. To this end, we have summarized some basic faults of the inverter for your reference. The following detection process does not need to open the inverter case, only some common phenomena are detected and judged externally.

1. Power-on trip or sparks appear in the terminal block of the main power supply of the inverter.

Detection method and judgment: Disconnect the power cable, check whether the input terminals of the inverter are short-circuited, and check whether the DC side terminals P and N of the inverter's intermediate circuit are short-circuited. The possible cause is a damaged rectifier or a short circuit in the intermediate circuit.

2. No indication on power-on: Detection method and judgment: Disconnect the power cord and check whether the power supply is lacking in phase or open circuit. If the power supply is normal, check if the DC side terminals P and N of the inverter intermediate circuit are checked after power-on again There is voltage. If the above check is normal, it is judged that the internal switching power supply of the inverter is damaged.

3. No output during startup (motor does not start): Detection method and judgment: Disconnect the output motor line, observe the input frequency displayed on the panel of the inverter after restarting, and measure the AC output terminal. The possible reason is that the inverter startup parameter setting or running terminal wiring is incorrect, or the inverter part is damaged or the motor is not properly connected to the inverter.

4. "Over voltage" protection during operation, the inverter stops output: detection methods and judgments: check whether the grid voltage is too high, or the braking problem caused by too much motor load inertia and too short acceleration / deceleration time, please refer to Section 8 article.

5. "Over current" protection during operation, the inverter stops output: detection method and judgment: the motor is blocked or the load is too large. You can check the load or adjust the inverter parameters appropriately. If it does not work, the inverter part is aging or damaged.

6. "Overheating" protection during operation, the inverter stops outputting: Detection methods and judgments: Depending on the configuration of the inverter of each brand and model, the ambient temperature may be too high to exceed the inverter's allowable limit. Check whether the cooling fan is running or the motor Overheating has caused protection to close.

7. "Grounding" protection during operation, the inverter stops output: detection method and judgment: refer to the operation manual to check whether the inverter and the motor are reliably grounded, or measure whether the insulation of the motor is normal.

8. Braking problem (over-voltage protection): detection methods and judgments: If the motor load is really too large and needs to be stopped in a short time, you need to buy an inverter with a braking unit and configure a braking resistor of equivalent power. If the braking function is already configured, the braking resistor may be damaged or the braking unit detection may fail.