CZone Diagnostics

Fault finding - Diagnostics

Always check the obvious!

Treat a digital switching installation like any traditional system

Is there a signal at the input?

Is there power feed to an output device?

Is their power coming out of the output device?

Does the configuration match the inputs?

Believe it or not incorrect wiring still happens with Digital switching installations. With any new technology the easiest diagnosis is to blame the system

Before You Begin

Check network and device status:

Using Configuration tool or CZone display

Fault finding - Network

Are all modules online, with no conflicts?

Configuration tool:



Onboard display:



If yes:

• System is ready to use

• Fault is elsewhere – start diagnosing other areas



If No – here are some possible codes you will see:

“Conflicting Module”

If a Conflict error is displayed then two or more modules have the same

dipswitch setting

• The module stating ”Conflict” has the correct setting

• The Module reporting ”Offline” is incorrect


Conflicting Modules – Solution

Reset the dipswitch setting on the module to match the configuration tool:

1. Obtain the correct dipswitch setting for the module:

2. Unplug the NMEA2000 connection to the module and set the dipswitches to the correct setting

3. Reconnect the NMEA2000 cable


Offline Modules

A module that is not communicating with the network will be identified as being “offline”

Alarms will also be raised on the displays appearing as a “Blue Bell” alarm.

The error message will state that there is a “Device Missing”


Offline Modules

Are all modules offline?

Are Just some modules offline?


Missing Modules - All modules are offline

Configuration related checks:

• The USB – CAN tool is plugged in correctly

• The drivers for the USB-CAN module have

been installed correctly on the PC

• The configuration tool has been opened

after the system has been plugged in and

turned on


All modules are offline

Physical network checks:

• Check all network connections have been made and are tight

• At devices

• Along the backbone and “T” joiners

• Check power to the network

• At the point of the power connection

• At each end of the network (minimal voltage should be detected)

• Have both terminating resistors been fitted?

• Check for shorts on data and power pairs

• Have bridges been connected and powered correctly?


Offline Modules

Physical network check:

• Check the network status LED on each module

The Network Status LED on each module has three functions:

• Green – Network power detected

• Red Flashing – Network activity

• Solid Red – Network failure such as shorted CAN high and low wires


Offline Modules

Physical network check:

Voltage Readings on network conductors:

•Red to Black 12VDC (supply voltage)

•Red to Shield 12VDC (supply voltage)

•Blue CAN L to Black (Neg) around 2.5VDC

•White CAN H to Black (Neg) around 2.5VDC

Resistance between CAN L and H should be 60ohms with no devices on network

Recommend cutting an end off an extension cable to use as a testing tool

CAN connections can be accessed internally on smaller boxes for voltage testing


Missing Modules

Only some modules are offline

Configuration related checks:

• Has the module got the correct Firmware

loaded for the network?

• All previously mentioned checks apply to

individual missing modules


Fault - Switches not controlling the correct load as per the configuration

eg Galley light switch controls cabin fans

Potential cause - Swapped Dipswitches. A module may have the incorrect

dipswitch settings for its application.

Solution - Identify the module correctly in the configuration design and reset its

dipswitch settings accordingly

Fault Finding – Operational Anomolies

Fault - The correct load is switching but the control of the load is not as expected

eg. a) A horn stays on when a momentary control button is pressed

b) A load turns on or off in the opposite direction to the button press

c) A load, which has many switches for controls, can not be toggled on or off after one of the switches has been turned on or off

General causes:

Incorrect switch output function is selected in the configuration tool

Incorrect switch wiring i.e. normally closed instead of normally open

Incorrect switch type installed i.e. momentary instead of latched

Switches wired to wrong input


Fault - If a load does not turn on when controlled by a switch (or display)

Potential cause - The load wire is connected to the wrong output channel.

Remedy - Check on the OI/MOI which status LED turns on and that the load

wiring is connected to the correct channel

Fault - A load can be controlled correctly by a display but the circuit switch does

not control the load (or controls a different load)

Potential cause - The wiring into the SI or SCI is incorrect

Remedy - Refer to the installation instructions and wire devices to match design


Fault - A load cannot be controlled (turned off) -

Potential cause - The fuse may be in the bypass position. Look at the appropriate channel and ensure the fuse is in the “Normal” position

Fault - A load has turned off un expectedly

Potential Causes

1. Load Shedding is enabled for the circuit and a low voltage trigger point is reached

2. Power to the network or at least the controlling modules network has been lost resulting in all loads shutting down.

3. The main power supply to the CZone™ module has been lost


1. Disconnect all wiring connections then remove the faulty module

2. Ensure the Firmware on the replacement device matches the replaced device

3. Ensure all the dipswitches on the new module are switched to the off position

4. If the module is an OI or a MOI remove the fuses from the failed module and

fit in the same locations on the new module (to ensure bypass fuses match

load)

5. Fit the new module and connect all wiring except the NMEA cable

Replacing Damaged Modules

6. Once fitted temporarily connect the NMEA cable until all the indication lights

flash once. Then remove the NMEA connection. This has now wiped any

program that may have been on the module.

7. Set the dip switches to match the settings of the replaced module. Once the

dipswitches are set plug in the NMEA cable.

After a short period of time the new module will receive a copy of the program

from the network and begin functioning normally

Replacing Damaged Modules

If a circuit cannot be controlled via the network or you wish to test the output channels manually the channel can be placed into a manual over-ride position

• Remove the cover from the OI

• Locate the channel you wish to bypass

• Remove the fuse from its ”Normal” position

• Place the fuse in the “Bypass” position

This will provide a complete mechanical bypass of the module

Note: It is important you ensure the fuse rating is appropriately rated

before putting the circuit into bypass

Warning. Bypassing can cause a potential ignition source. Ensure surrounding area is free of flammable/explosive gasses and vapors

Manual Circuit Bypass

Questions

Self Improvement

CZone Diagnostics