Nittan Evolution fault records

Battery internal resistance too high

The panel has measured the battery internal resistance and determined it is too high. The batteries will need to be replaced.

Standby batteries missing or disconnected

Check the battery fuse, check that battery connections are secure, check battery voltage (should be around 26-27V for well-charged batteries), check that the two batteries are connected in series, and check the charger fuse.

Nittan evolution 1: Break in -ve wire (ISOLATOR FAULT)

Reported as an ISOLATOR FAULT with a description. The manual says to use the same method to locate the break (re-run the loop search and check the detailed loop report). In its example, the break is between address 150, seen from side A only, and address 152, seen from side B only; this applies if the loop is addressed sequentially.

Nittan evolution 1: Break in +ve wire (ISOLATOR FAULT)

The manual says the panel's loop isolator monitors the addressable loop for open and short circuit faults, reported as ISOLATOR FAULTS with a description. For a break in the positive wire, it says to locate the cable break by re-running the loop search and checking the detailed loop report after the search is complete.

Nittan evolution 1: Cable break (loop contents different from expected)

If the loop contents differ from what was expected, the manual lists a cable break as a probable cause. If a system is only wired as a loop, any breaks will be reported and can be located as in section 12.1. If a system uses spurs, a cable break in a spur will not be seen: look for missing device addresses in the loop report.

Power supply is not charging the batteries

The panel has determined that the power supply is not charging the batteries. This is likely to be a problem with the Charger PCB — contact the supplier to arrange a replacement.

Two or more devices share the same loop address

Two or more devices may have the same address setting. All devices with the same address will answer at the same time and the panel will not be able to understand the reply it receives. Search the detailed loop report for double addresses, and for missing addresses elsewhere in the summary (a missing number is likely one of the double-addressed devices).

Negative-side earth fault

Something is shorting to earth on the negative side. Located using the same method as an Earth Positive Fault, but looking for shorts to loop negative rather than positive.

Positive-side earth fault

Something is shorting to earth on the positive side (usually through a cable screen). Most earth faults occur on the addressable loop — disconnect all loop connections and reset the panel; if no earth fault is reported the fault is on the loop, and can be located by splitting the loop in half and sub-dividing the bad section. Note that connecting other mains-powered equipment (e.g. a laptop) to the panel can itself give an earth fault.

Open circuit on a panel local input

Check the local input has an end-of-line resistor fitted, check it is the correct value (4.7 kΩ), and check for cable breaks or loose connections.

Short circuit on a panel local input

Check for cable short circuits on the circuit, check the end-of-line resistor is the correct value (4.7 kΩ), and check there are no normally-closed switches connected to the circuit.

Open circuit on a panel local output (sounder circuit)

Check the local output (sounder circuit) has an end-of-line resistor fitted, check it is the correct value (4.7 kΩ), and check for cable breaks or loose connections.

Short circuit on a panel local output (sounder circuit)

Check that there are no cable short circuits on the circuit, and check that there are no non-polarised devices connected to the circuit. (The manual lists these two checks for this message.)

Loss of mains power to the panel

Check if mains power is present, and check for 29.5V DC at the PSU cage output.

Nittan evolution 1: Reverse polarity devices (missing from the loop)

The manual says some devices are polarity sensitive and will not be seen if the + and - connections are reversed. Look for missing devices in the loop report and check their connections.

Nittan evolution 1: Short circuit in the middle of the loop

The manual says a short circuit in the middle of the loop will usually cause two loop short circuit isolators to activate, and the devices between the isolators go missing because they are no longer powered. The short circuit will be somewhere between the two operated short circuit isolators; check which addresses are missing.

Nittan evolution 1: Short circuit on side A of the loop (ISOLATOR FAULT)

If the panel reports a loop short on side A, the manual says there is a short circuit fault on the loop somewhere between the panel (side A) and the first device with a short circuit isolator on the loop.

Nittan evolution 1: Short circuit on side B of the loop (ISOLATOR FAULT)

If the panel reports a loop short on side B, the manual says there is a short circuit fault on the loop somewhere between the panel (side B) and the last device with a short circuit isolator on the loop.

Abnormal microprocessor running condition

A system fault is an abnormal microprocessor running condition caused by various unexpected phenomena. The panel attempts to correct itself; while the fault is present the System Fault LED, General Fault LED, General Fault relay and internal fault buzzer are constantly active. Clear via the system fault reset button underneath the PCB. If the fault does not clear, consult the distributor.

Nittan evolution 1: Zone fault LED

The manual lists several reasons for the zone fault LED to light: a device has been removed from that zone; a device has been changed for one of a different type; there is a double address in the zone; or a device in the zone is communicating a fault condition to the panel. For an interface, it says the fault message indicates whether the interface has detected an open or short circuit fault on its field wiring, or has lost its auxiliary power supply input.