End of line (EOL) resistor circuits are one of the basic building blocks of security and access control systems. Field devices such as reed switches, duress buttons, motion sensors and locks all use EOL circuits to tell the security panel the device state and help to ensure that the cable serving each device is kept […]
Why you shouldn’t use the resistors that come with security panels. Read More »
Electric strikes are a popular choice for securing doors, for good reason, they are a cost-effective and versatile option. Electric strikes work with standard door hardware and can be configured to fail secure or fail-safe. They often also have outputs for monitoring the status of the locking solenoid (Lock Status Sensor, LSS) and the position
Electric strike tongue sense as REX. A flawed practice. Read More »
A customer from WA found this in the course of his travels. Once again a separate fire trip relay has been mistakenly used! To make things worse the power has been fed into the expansion outputs rather than the dedicated inputs. This will work however it makes things harder for the tech who has had
Missing the point….. again Read More »
I found this today, a recent install. Maybe we need to make the instructions a little more clear/simple. The installer has used a separate relay to take the fire interface and monitor the fire trip. They have then fed the switched power into the fuse module. The whole point of the PP8FR is to provide
Missing the point….. Read More »
Yes that is a sliding door! This mag lock was installed by a carpenter, it is switched via a cheap hotel style locking system. Obviously this did not work long due to the lock grabbing the armature plate as soon as it slid close to the face. The door would not close and quickly the
If you are finding a mag (electromagnetic) lock to be “sticky” or slow to release it is likely that it has a diode connected across the power terminals. Remove it, problem solved. This is a common mistake. The reverse biased diode is supposed to prevent a current spike (often call back EMF) caused by the
Mag Lock Slow to Release? Read More »
Yesterday I was called out on a service job to one of the worst installs I have seen in a while. What makes it worse is that Jack Fuse Power Port modules were being used! What makes it even worse is that it was an add on to a system that I upgraded relatively recently.
Yes that is a solid Perspex box glued over the break glass unit to prevent it ever being used! I found this recently in the foyer of a commercial building on the only exit.