Edwards AE Bulletin E-FSA Loop Faults

AEBN 041113 April 11 2013 E FSA Addressable Panel Loop Faults Loop Fault Line Fault on the E FSA panel loop controller can be caused by a couple depending on how the system is configured A short on the loop plus and minus data wires touch each other will cause a Loop The short will also shut down the loop controller card and cause faults for every device on the loop that has been programmed If the is configured for Class A wiring and has isolators however the card will not shut but you will still get a Loop Fault and you will only get comm faults for the between the isolators where the short occurred Reverse polarity on the loop controller wiring that has devices which also require 24Vdc such as the E NAC and E 2WIRE modules can also look like a short the same symptoms A break in the wiring of a Class A configured loop will cause a Loop Fault On a B loop with a break in the wiring you will not get a loop fault You will only communication faults for every device wired after the break are 3 LEDs on the loop controller card itself that can help you figure out what going see figure 1 The Comm LED indicates the card is communicating with the panel motherboard normal conditions this LED should be flashing rapidly almost steady on The Primary LED indicates the communications on the Loop PRI terminals is This should also be flashing rapidly almost steady on The Secondary LED indicates the card is communicating on the Loop SEC terminals A wiring return This LED will only turn on when there is a break in the and the loop is configured for Class A Under normal conditions the card only on the Loop PRI terminals therefore the Secondary LED should not be if the loop is not configured in programming for Class A the Loop SEC terminals the Secondary LED will not function Signaling Part of UTC Climate Control Security 3 Farm Glen Blvd Farmington CT 06032 800 336 4206 Web www edwardssignaling com E mail signaling techsupport fs utc com 1 of 2 SEC PRI 1 Controller the system is powered up and none of the LEDs on the loop controller card are on that the card has shut down The first thing you should do is disconnect all field wiring the card and wait a few moments maybe up to a minute If the Comm and Primary begin to flash again then you know it a wiring problem short or backwards You will need to fix the wiring before you can continue If the Comm and Primary do not turn back on after the field wiring is removed then there is something wrong the loop controller card itself A short on the loop wiring should not damage the card the card should restore itself after the short is removed other possibility for a Loop Fault is when the loop is wired for Class B but is programmed for Class A If you intend for the system to be wired Class B and are only connecting to the Loop PRI terminals on the loop controller card but the LED is on and the Panel shows a Loop Fault check the Loop Configuration To do this at the panel go into Menu Programming Advance Programming Configuration Loop Class and make sure it is set for Class B A Loop Fault caused by a short on a Class A circuit with isolators or a break in A wiring is a latching type of fault meaning the fault will not clear itself after the has been fixed You must do a Panel Reset just push the Reset button to clear the it may take up to 45 seconds after the Reset button is pushed Signaling Part of UTC Climate Control Security 3 Farm Glen Blvd Farmington CT 06032 800 336 4206 Web www edwardssignaling com E mail signaling techsupport fs utc com 2 of 2