Sometimes there are problems with an access control system. I am going to start a section with troubleshooting and other solutions to common access control problems. Let’s start with one we worked on yesterday.
The customer called and said that the card was reading but the door was not opening. I asked if there had been any mechanical problems with the door or of there had been anyone working in the area that could have severed a wire or done other damage to the system. That is actually on of the most common problems with access systems, someone doing unrelated work can damage the wire or equipment not knowing what it is connected to. In this case I knew that there were separate power supplies for the lock and system components so I asked the customer to check the power supplies. He noted that the light was off on the plug in transformer by the door. Since he didn’t have a replacement, I headed that way.
When I arrived, the plug in transformer showed no light, nor did the power supply board it was hooked to. I checked the power supply with a meter and it showed no voltage so I replaced it and everything was working again.
What happened to the transformer? Since there were no signs of any trouble I left a spare transformer in case it went again. It was probably a failure of the transformer due to age. It could have been a transient event such as a power surge or a connection got wet, but all the wiring looked good.