Solutions to common faults of dual power automatic transfer switches

一. After the power is turned on, the dual power automatic transfer switch does not work, and the controller light does not light up:
① Whether all lines are installed correctly and firmly.
②Check whether the fuse core is broken.
Solution:
①Check the line, if there is any installation error, correct it in time, if the line connection is not firm, reconnect it.
②If it is confirmed that the fuse core is broken, replace the fuse with a new one.

二. When the power is turned on, the dual power automatic transfer switch does not work, but the controller light is on:
①The automatic transfer switch is not switched to the automatic position.
②The automatic transfer switch delay adjustment time is too long.
Solution:
(1) Turn the automatic transfer switch to the manual position, and the automatic switch light of the b-type controller cannot be in the automatic position.
②Re-adjust the delay dip switch and reset the controller.

三. Double power automatic transfer switch trip light:
①The circuit breaker may trip during transportation.
②The circuit breaker trips during use.
Solution:
(1) In the first case, after depressing the trip button, when it automatically switches to the automatic state, press the reset button at the same time.
②If the circuit breaker trips during use.
1) Check whether there is a short circuit, and then proceed to the next step after eliminating the short circuit phenomenon, otherwise personal injury may occur.
2) Overload may also cause tripping.
Maintenance method of dual power supply in high-rise buildings.
In the design of many high-rise buildings, there are as few as dozens of output double circuits, such as elevators, fire fighting, water pumps, emergency lighting, etc. The use of dual-circuit power supply not only improves the reliability of the power supply, but also increases the failure rate when the dual power supply is converted. For high-rise buildings, there are many power conversion circuits, and terminal conversion boxes are widely distributed. When a fault occurs, quickly finding the real faulty circuit is a tricky problem. Based on the years of experience in dual power supply maintenance of Changji Electric’s after-sales department, combined with the circuit design of high-rise buildings, we will discuss the basic maintenance methods for the next high-rise building when the dual-power automatic transfer switch fails.
1. The phenomenon of dual power conversion failure.
Common faults of dual power automatic transfer switches.

a. The dual power supply cannot be converted.
It is a common fault phenomenon that the dual power supply cannot be converted. The main power supply has a power failure, and the backup circuit has power, but cannot switch to the backup power side.
B. Double power automatic transfer switch repeated conversion.
Repeated switching of dual power automatic transfer switches is an uncommon failure phenomenon, but once such a failure occurs, it will have a great impact on the power safety of high-rise buildings, resulting in repeated switching of all circuit terminals in the entire building, and the lights in the building will be turned off. Bright for a while, dark for a while, can’t tell which end has a problem with switching. In high-rise buildings, this type of failure usually occurs when the utility power fails and the backup power cannot be sent. This matter is urgent and must be dealt with quickly.
Second, the dual power automatic transfer switch cannot switch fault finding and processing.
When the dual power supply of a circuit cannot be converted, the fault can be found for the distribution box, and it can generally be judged which circuit end conversion box has a problem. However, the staff should know the possible causes of the failure in advance, so as to avoid the staff being anxious when the failure occurs.
There are three possible situations that the dual power supply cannot be converted: there is a problem with the intermediate relay; there is a problem with the AC contactor of the backup circuit; the secondary circuit is disconnected. All of these conditions can cause the intermediate relay to not work properly.
When this kind of failure occurs, turn on the dual power automatic transfer switch to find the original failure, because there must be burn marks at the failure point.
According to the maintenance experience, the most effective way to prevent the automatic transfer switch of the dual power supply from being switched is to manually switch all the dual power supplies on a regular basis (usually once a month), check whether the intermediate relays and AC contactors can work normally, replace them in time if any problems are found, and control them in advance. Fault. The most effective prevention cannot eliminate 100% of failures. Therefore, the electrician should prepare enough spare parts for the above situation, and repair it in time when the dual power supply cannot be converted.


Post time: Jun-03-2019