CB780E/CB784E RELAY MODULES WITH VALVE PROVING
32-00150—03
42
750-234
TROUBLESHOOTING
Troubleshooting can be accomplished by using the 833-
2727 Keyboard Display Module (KDM) or a blinking
POWER LED.
The Power LED provides fault identification when the relay
moduel locks out an alarm. Fault identification is a series
of fast and slow blinking LED lights. The fast blinks
idenyify the “tens” portion of the fault code (for example,
three fast blinks = 30). The slow blinks identify the “units”
portion of the fault code (for example, 2 slow blinks = 2).
Three fast blinks followed by two slow blinks = fault code
32. (See Table 14 for the blinking fault code list).
The LED code repeats as long as the fault exists. To clear
the fault, press the RESET button.
Use Table 14 to identify fault code numbers, possible
system failure, and recommended troubleshooting
procedures.
Insert Safety and Security Details here
SAFETY AND SECURITY
Physical Device Protection
Device shall be accessible to authorized personnel only –
Installation on publicly accessible places is not
recommended as this could lead to unwanted and
potentially unsafe changes to device (wiring,
configuration, etc).
It is recommended to lock the device in an enclosed
cabinet with access allowed only to approved and trained
personnel. Also, it is strongly advised to keep all the wiring
of device physically secure.
Physical protection of the device is applied via Run/Test
switch label/seal. It is intended to prevent and detect
unauthorized access.
Modbus & DDL Interface security Any conducts critical to
device functionality (DDL, Modbus lines etc.) shall be
physically protected (installed outside public access)
since they could be damaged or tampered-with by
unauthorized people, either accidentally or for purpose.
Modbus RS-485 & DDL protocols do not support security
features. For DDL interface - only DDL devices shall be
connected to the Burner Controller DDL line.
License Agreement
Copying and reverse engineering is prohibited by the law.
Table 14. Blinking Fault Codes and Recommended Troubleshooting.
Blink Code
System Failure
Recommended Troubleshooting
Code 1-1
*Low AC Line
Voltage*
Low AC Line detected.
1.
Check the relay module and display module connections.
2.
Reset and sequence the Relay Module.
3.
Check the system power supply and make sure that frequency and voltage
meet specifications.
4.
Check the backup power supply, as appropriate.
Code 1-2
*AC Quality
Problem*
Excessive noise or
device running on slow,
fast, or AC line dropout
detected.
Code 2-1
*Unexpected
Flame Signal*
Flame sensed when no
flame is expected
during STANDBY or
PURGE.
1.
Check that flame is not present in the combustion chamber; correct any
errors.
2.
Make sure that the flame amplifier and flame detector are compatible.
3.
Check the wiring and correct any errors.
4.
Remove the flame amplifier and inspect its connections. Reseat the ampli-
fier.
5.
Reset and sequence the relay module.
6.
If the code reappears, replace the flame amplifier and/or the flame detec-
tor.
7.
If the fault persists, replace the relay module.
