95-8533
5-8
18.2
Symptom Possible Cause Corrective Action
Controller Power
LED/
Text Display OFF
No Power to Input. –
Measure input voltage (18 to 30 Vdc).
–
Check that P1 is fully inserted.
If voltage is present and P1 is fully inserted,
replace controller.
LON Fault – LED
lit.
LON wiring is shorted or open. –
Check that P7 is fully inserted.
–
Using the EQ Safety System Software,
determine the location of open or short via
LON Diagnostics screen.
–
Use a multimeter to determine wiring fault.
Trouble Relay is
Active.
Any monitored device in the
system including ground fault
in fault condition.
–
Using the front panel display/controls, view
all points in alarm/fault and identify faulted
device.
–
Repair or replace faulted device as
necessary.
Digital inputs
are not
responding.
–
Bad input switch.
–
Faulty input channel.
–
Faulty wiring.
–
Configuration error.
–
Check that P2 and P3 are fully inserted.
–
Using a voltmeter, measure input terminals
with contact closed to the input (measures 0
vdc when input contact is closed, measures
approximately 23 Vdc with circuit open and 24
vdc input at the controller).
–
If input does not respond to a contact closure,
replace module (verify response with EQ
Safety System Software/textual display).
–
Verify configuration.
Relay Outputs are
not respond to an
output command
–
Bad relay channel.
–
Faulty output wiring.
–
User logic.
–
Check that P4 and P5 are fully inserted.
–
When output should be energized, measure
contact resistance using an ohm meter.
–
Verify that wiring from output is not open.
–
Using EQ Safety System Software, verify that
logic is trying to operate the channel.
Serial links are not
responding.
–
Faulty wiring.
–
Incorrect serial link
configuration.
–
Text display shows "Invalid
Configuration"
–
Check that P8 and P9 are fully inserted.
–
Verify that communication LEDs are
flashing.
–
Verify that serial link configuration matches the
host device.
–
Verify that wiring is not open or shorted.
Ethernet link are
not responding
–
Faulty wiring.
–
Incorrect Ethernet link
configuration.
–
Text display shows "Invalid
Configuration"
–
Check that P3 and P4 are fully inserted.
–
Verify that communication LEDs are
flashing.
–
Verify that Ethernet link configuration is
correct.
–
Verify that wiring is not open or shorted.
Front panel
pushbuttons are
not working
–
Power OFF.
–
Controller is faulted.
–
Verify that power is present and P1 is fully
inserted.
–
Cycle power to controller.
Text dispaly
indicates a RTC
Fault
Power loss for more than 12
hours
–
Using the Safety System Software, execute
“Set RTC”, which downloads the current
time into the Controller’s real time clock.
Alternatively, use the “Set Time and Date”
menu in the Controller.
Table 5-2—System Controller Troubleshooting Guide
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