How to prevent the entire zone from starting up at high speed at the same time after FFU is restored from a power outage

Why power outage recovery requires a startup strategy

When the FFU group control system restores power after a power outage, if there is no clear startup strategy, all FFU may return to the settings before the power outage or the default high-speed state at the same time. Starting the entire district at high speed at the same time will have several impacts.

In terms of electrical aspects, if multiple FFUs are started at the same time, the instantaneous current may be large, causing impact on the power distribution system and controller. If the power supply capacity is limited, voltage fluctuations or protection operations may occur. In terms of air flow, high-speed air supply to the entire area at the same time may change the room pressure difference and air flow organization, affecting the stability of the clean room. In terms of equipment, starting at the same time may increase the starting load of the fan and motor and affect the service life.

Therefore, after FFU is restored from a power outage, it is recommended to group it according to a certain strategy or start it in stages instead of restoring the entire zone at high speed at the same time. Aili Industrial has complete supporting capabilities in FFU control systems and can provide group control startup strategy solutions. For the basic configuration of FFU control and communication, please refer toAili Industrial FFU fan filter unit。

How to retain parameters after power outage

The power outage recovery strategy must first clarify the parameter retention method. After the FFU group control system is powered off, whether the set values, addresses, partitions and operation plans are retained depends on the storage design of the controller and system.

If the parameters can be retained, the FFU can operate according to the settings before the power outage after the power is restored. If the parameters are not retained, the FFU may return to the default state after power is restored and needs to be reset. The startup strategy is different in the two cases.

It is recommended to confirm the parameter retention method during system design and test the power-off recovery process during the debugging phase. If the parameters cannot be retained, you should confirm whether the default state after restoration is safe and whether manual confirmation is required before starting.

How to design the startup sequence

The startup sequence can be designed by region, by group or by priority. By starting by area, you can start the auxiliary area first, and then start the key area. Starting by group can divide FFU into several groups and start them in sequence. Starting by priority can start the area with higher cleanliness requirements first according to the process requirements.

The starting sequence should be determined based on the power supply capacity and air flow organization. If the power supply capacity is limited, it can be started in batches to avoid excessive instantaneous current. If the airflow organization is sensitive to pressure differences, it can be restored gradually by area to avoid simultaneous changes in the entire area.

The startup sequence and grouping method should be recorded in the group control system configuration and verified during the debugging phase.

How to agree on the operating mode

After power outage is restored, FFU can enter different operating modes. For example, enter low-speed operation mode first, confirm that the system is stable, and then switch to production mode. Or start some areas first, and then start other areas after confirming that the pressure difference and air flow are normal.

The operating mode should clarify the target state and switching conditions after recovery. If the project has production mode and duty mode, you can enter duty mode first after recovery, and then enter production mode after the system is stable.

The agreement on the operating mode can reduce fluctuations in the recovery process and give the operator time to confirm.

How does the group control system support group startup?

If the group control system supports group startup and staged recovery, the startup strategy can be implemented more conveniently. Grouping can be set by address, partition or priority. Staging can be achieved through delayed starts or conditional triggers.

For useFFU/EFU group control touch screen controller orFor FFU computer group control system projects, it is recommended to confirm whether group startup and delayed recovery are supported during the system debugging phase. Aili Industrial has a complete product line in FFU control systems and can provide control solutions according to project requirements.

How to retest after recovery

After the power outage is restored, it is recommended to retest the system. The retest content includes: FFU operating status and setting values ​​in each area; room pressure difference and air flow direction; wind speed and cleanliness in key areas; whether the power supply current and voltage are normal; whether the controller and communication are normal.

If abnormalities are found, the startup sequence or operating mode can be adjusted. Retest records can help optimize recovery strategies later.

Issues that should be confirmed in advance during project communication

During the design and debugging stage of the FFU group control system, it is recommended to confirm the following with the manufacturer: whether the parameters are retained after power outage; the default state after restoration; the startup sequence and grouping method; operating mode and switching conditions; whether the group control system supports delayed or grouped startup; power supply capacity and startup current requirements; retest content after restoration; whether manual confirmation is required before startup.

If you are planning the FFU group control startup strategy, you can visitAili Industrial FFU fan filter unit to learn about the complete machine configuration, you can also refer toFFU/EFU group control touch screen controller andFFU computer group control system to learn about the control scheme, or contact Aili Industrial for group control support.

in conclusion

After the FFU is restored from a power outage, the entire zone should be prevented from starting up at high speed at the same time. The startup strategy should specify parameter retention, startup sequence, and operating mode. Grouped startup and staged recovery can reduce electrical and airflow shock. After recovery, the system status should be retested to confirm normal operation.

Aili Industrial has a complete product line in FFU control systems and can provide group control startup strategies based on project requirements. If you need to know more about FFU group control recovery, you can visitAili Industrial FFU fan filter unit , you are also welcome to contact Aili Industrial for project support.