Posts Tagged ‘fuse’

PP10HD Available NOW

Friday, March 6th, 2015
Jack Fuse PP10 HD

High Density Fuse Module Resettable Fuses











The PP10HD is the latest Jack Fuse product and is a compact high density fused power distribution module; it features.

  • 10 X 1A  outputs with poly fuses (resettable)
  • Double deck terminals for compact size (75 X 55mm)
  • DIN rail mounting
  • LED fuse status indication

The new PP10HD is designed to provide cost effective power distribution and fuse protection to a wide variety of security field devices and is small enough to fit inside any security panel. Perfect for protection associated with detectors, keypads and sirens.

The PPTC fuse’s will automatically re-set once the fault has cleared, reducing service costs and increasing system reliability.

It can also be combined with our PP8FR or a standard relay to provide fire tripped power in electronic access control applications.

Visit the Jack Fuse website for more information.

Care when terminating.

Saturday, August 11th, 2012

Recently one of my re-sellers had to rush to site with a replacement module for a PP8FR that had a “faulty” output. Fuse one would blow every time power was applied to the board.

On inspection I removed the main output terminal plug and found a single strand off copper shorting the output. I brushed it off and the unit worked like new.

It is sometimes easier to terminate to the main output plug while removed from the PP8FR. In this case while striping/cutting the cables the tech had inadvertently dropped strands of copper onto the board and one got stuck behind the replaced plug. A simple enough mistake to make and a good reminder to take care when terminating around exposed electronics. If the copper had fallen on a controller the cost could have been considerable.

Fuse Fail (Fail)

Saturday, June 9th, 2012

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.

The call came in (late on Friday and my day off!) that several mag locks had no power. To cut a long story short, a company had added three doors to an existing system in an area of a building that previously had only an alarm system. Two of the locks and a keypad were without power.

Eventually after a few red herrings I diagnosed a blown fuse. The problem was caused by the use of a 1A fuse to protect about 1.3A worth of equipment. Along the way I found a litany of other faults and poor practices. I will detail a few.

One of the alarm keypads was connected to fire/lock power. So the blown fuse killed it. I just had to change the link setting on the PP4F to solve the problem. The keypad would have also turned off in the event of a fire trip.

Fire tripped lock power for at least two of the doors was supplied on a single pair in a four core security cable. Four core cable has a low current rating and there was a decent voltage drop present. I had to be mindful that I installed an appropriate fuse to limit current on the cable. To make matters worse RS485 communications were supplied on the same unshielded cable.

The door and reader power was added to a single power supply that is now over loaded. This is a common problem I see during add on installs. Proper thought must be given to power supply and battery capacity. A new unloaded separate power supply was installed but used only to power a single controller and door?? There was not battery or monitoring on the new power supply!

Other problems included multiple faulty inputs that had been shunted in the software to prevent alarm runaways filling up the alarm viewer, substandard cabling that was just laid across the ceiling tiles, at least one door controller not mounted and just hanging by cables, detectors not to client specification, a general rats nest of cables in panels, electrical tape over soldered (or not soldered) joins and items mounted out of level.

It is exactly this type of poor quality install that gives the industry a bad rep and kills confidence of clients/users in their systems.  As far as I can tell this particular install is still under warranty so hopefully the client can get the techs back to fix it all.