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Maintenance
7.
Program the desired address then disconnect the programmer.
8.
Connect the removable TB3-TBx field element terminal blocks.
9.
Connect the removable TB2 communication ring terminal block.
Under normal operating conditions, the green RUN LED on the module must be on solid, while the
two yellow LK1-Fault and LK2-Fault LEDs must be off.
5.3 Troubleshooting
The following table contains the main causes of system malfunction and possible solutions:
Problem
Message on Panel Indicates:
Rack xx Pos. yy Loop open
Device removed
Dispersion failure
PSU1 failure
PSU2 failure
Stand-alone
25V failure
Temperature failure
Internal failure
Firmware not compatible
Device not compatible
Multiple address
Log on fault
57
Possible Causes
• Open or short circuit on at least one
segment of the communication ring
• Module failure
• No power
• Power voltage dispersion/leakage to
ground of a local power supply
• Local power supply failure
• No main power
• Local power supply battery failure
• SB-ECM module reconnected on the ring
following a back-up logic
• Module power supply voltage out of
range
• Module internal temperature out of range
• Internal module failure
• Firmware version not compatible with the
control board
• Module not compatible (Brand)
• One or modules along the ring have the
same address
• Discrepancy between the modules
programmed in the panel and those
detected by the control board
Solution
• Identify the damaged segments using the
diagnostic cycle
• Check the wiring and measure the wire impedance
using a multimeter
• Check that the module is powered. If power is
present:
• Check that the green RUN LED is on. If not, replace
the module
• Disconnect the module wires
• Identify the wire leaking to ground using a
multimeter
• Check the presence of the main power supply. If
power is present:
• Replace the local power supply
• Check that the batteries are good and properly
connected. Replace the batteries if necessary
• Reset from the control panel operator cycle menu
• Use a multimeter to check that the module power
supply voltage is between 20V and 28V
• If the power is within the allowed range, replace the
module
• Check that the ambient temperature is between -
40°C and +70°C
• Cut off power to the module for 5 seconds
• If the problem persists, replace the module
• Replace the module with another one that has a
compatible firmware version
• Replace the module with a compatible one
• Identify the modules with the same address using
the diagnostic cycle
• Reprogram the correct module address in the
modules with duplicate addresses
• Identify the wrong modules using the diagnostic
cycle
• Replace the wrong modules or re-program the
panel with the correct module type
Safety Bus Manual — P/N LS10177-000HI-E:B 02/21/2019
Troubleshooting
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