Weak current College】 【BA drainage system common fault analysis and removal method.

Trouble phenomenon: the pump does not start correctly

Possible fault analysis: program setting error, float, etc. related to out-of-water level monitoring components, perform a component failure (such as relay implementation module connection loose)

Exclude method and procedure:

1. check the exclude procedures set the error, it will pump start control switches, pumps run feedback status, ball float liquid state set in autorun status to see if there is any time process control;

2. simulation testing method:
First, in the central control hosts will pump start control switch close, observation for running status feedback, if you have run the status feedback, you can determine the range of control signal input circuit, such as float input modules, connectors, etc. Then continue to use the simulation test method to determine the input module is intact, in the central control of the host manually set ball float liquid level alarm for the low that meet the conditions for the pump starts automatically, if the pump does not start, and then enter the module has the possibility of failure, in this case, using the substitution method, the replacement of a normal module determines whether the fault point; if on a module, the pump starts to determine the input module is normal, this is clearly the float to the DDC segment is at fault. Simulated test method, in the DDC on low level signals to be shorted, observation of the pump is running, if you are running, the point of failure is usually a float inside micro switch failure, replace the ball float.

3. If, in the central control hosts will pump start control switch close, not running status feedback, so the point of failure on the implementation of the loop normally. As a rule of thumb often pump electrical control cabinet, manually start the pump, if you are running properly, then the fault in the automatic electronic execution loop; when determining whether the failure to perform the automatic electronic circuit, the first universal table test automation implementation Relay operating voltage is normal, if properly used alternative method to determine whether the normal execution of the output module, in this case are generally perform output module fault.

Symptom 2: living pool high level alarm, but has been running non-stop water pump

Possibility of failure analysis: this failure, usually perform circuit problems, and should not be considered input floating ball circuit has a problem, since we received a high level alarm signal feedback information, description float all contacts and input modules are not defective.

Exclude method and procedure: according to experience, first check the automatic execution of relay normally closed contact is-fusion-welded, measuring whether the implementation of the relays have continued working voltage, if not, you can determine is the electric drive circuit failure; if there are continuous operating voltage should be perform output module fault or an error, then the logic control procedures with alternative methods, the replacement of a normal execution output module test; if the pump is stopped, so is the module fault; if you still cannot stop that logic program does not, then enter the logical control program in BAS change logic.

In short, in the actual field, various problems may be strange, but as long as flexible cross-use the above method, you can exclude a site failure.