On the display
The display reads ** FAULT ** Press <FIRE ALARM ACK> to review followed by the summary line FIRE = 0 PRI2 = 0 SUPV = 0 FLT = 1. The message appears during the Walk Test™ procedures after a control point has been turned ON or OFF and the <C/EXIT> key is pressed. Immediately before it, the display shows the forced point — for example MASTER SIGNAL POINT 2, SIG2 SIGNAL CIRCUIT OFF after the point was turned OFF, or MASTER SIGNAL POINT 2, SIG2 SIGNAL CIRCUIT ON after it was turned ON.
What it means
This is the system fault summary (FLT = 1) shown after a control point is forced OFF; the same display appears after forcing a point ON. The counters read FIRE = 0, PRI2 = 0, SUPV = 0 and FLT = 1 — one system fault, with the other counters at zero. The fault is raised because a control point has been taken out of the AUTO state: the <ON> key press manually turns a control point ON and prevents automatic operation by increasing its priority, causing it to remain ON. AUTO is the normal state for all control points, and the <AUTO> key press leaves a point in its current state (ON or OFF) but allows the system program to control it. The <ON> key press has no effect on monitor points.
Why it appears
- A control point was taken out of the AUTO state with the <OFF> key (or the <ON> key) followed by <ENTER>.
- With the exception of pseudo points, turning a control point ON with the <ON> key results in a system fault.
- The normal state of all control points is AUTO, and
A fault exists if any control point is taken out of the AUTO state.
What to check
- Press <FIRE ALARM ACK> to review and acknowledge the fault.
- Identify the forced control point — in the Walk Test example it is shown on the alphanumeric display as MASTER SIGNAL POINT 2, SIG2 SIGNAL CIRCUIT OFF (or SIG2 SIGNAL CIRCUIT ON if the point was turned ON).
- If the <AUTO> key is passcode protected, perform the system Log In Procedures.
- Ensure the point to be turned AUTO is shown on the alphanumeric display.
- Select/enter the required point on the alphanumeric display.
- Press <AUTO> — the fault tables give the return-to-automatic action as <AUTO> + <ENTER>.
- Confirm that the display returns to SYSTEM IS NORMAL.
Reset and restart
Press <FIRE ALARM ACK> to review and acknowledge the fault, then return the point to automatic control with <AUTO> + <ENTER>; the display then returns to SYSTEM IS NORMAL. The <AUTO> key press leaves a point in its current state (ON or OFF), but allows the system program to control it.
Questions engineers ask
Why does the Simplex 4100ES show ** FAULT ** with FLT = 1 after I force a point?
A control point was taken out of the AUTO state with the <OFF> key (or the <ON> key) followed by <ENTER>. With the exception of pseudo points, turning a control point ON results in a system fault, so the summary shows FLT = 1 while FIRE = 0, PRI2 = 0 and SUPV = 0.
How do I clear the ** FAULT ** message on the 4100ES?
Press <FIRE ALARM ACK> to review and acknowledge the fault, then return the point to automatic control with <AUTO> + <ENTER>. The display then returns to SYSTEM IS NORMAL.
Does the <ON> key affect monitor points?
No — the manual states that the <ON> key press has no effect on monitor points; the fault summary appears when a control point is out of the AUTO state.
Can a control point be left forced ON or OFF?
No. The normal state of all control points is AUTO, and a fault exists if any control point is taken out of the AUTO state, so return the point with <AUTO> + <ENTER>.
Source
Written from the manufacturer's manuals for the Simplex 4100ES; every number and designation on this page is checked against them before publication. The row of the manual this message comes from:
All Simplex 4100ES messages: fault codes · Simplex 4100ES documentation · Simplex manuals