NEXUS STATION | TECHNICAL OPERATIONS AND MAINTENANCE GUIDE APR/2017
79 INSTRUCTIONS FOR TROUBLESHOOTING COMMON COMPONENT ERRORS | AIR VALVE AND SLIDE PLATE ERRORS
Instructions for troubleshooting common component errors
Common Nexus Station errors are listed by component. For each error, first follow the overall Instruction
details and expected conditions, and then consult the table containing specific details for each component.
Observe the movement of the component and motor for the appropriate expected condition, and then add
the actions outlined in the instructions for the component, and see the accompanying photo illustrations
for reference.
Air valve and slide plate errors
The air valve and slide plate are two parts of a single assembly. They operate similarly, each with a sensor
magnet that moves between two sensors that are tripped as the device is opened or closed, and the same
type of motor that controls movement of the device. The magnet on the slide-plate sensor is located below
the cover and not visible from the top of the station.
Air valve did not close / open
The same troubleshooting procedures work for both air-valve alarms. To inspect the area inside the air valve,
you may need to remove the assembly cover if it is in place
. See “Upper air manifold (slide-gate cover)” on
page 44..
No. Error Description
4112
4113
Air valve did not close
Air valve did not open
The rotary air valve at the slide plate has failed to either open or close. This failure
could result from a failure of a sensor, harness, gear, or motor that controls the
opening and closing of the valve.
4192
4193
Slide-plate unable to close
Slide-plate unable to open
The system has not registered an expected closing or opening of the slide plate,
either because the plate has not moved or the end-of-travel sensors have not
detected its movement. It can result from a failure of a sensor, harness, or motor.
TABLE 2. Troubleshoot Nexus Station air-valve errors
Sub-component | action Details | expected condition | next steps
1 Inspect power harness PCB connection. Harness–P29; PCB connection–J29
2 Observe signal LEDs as the air valve opens
and closes.
D30 and D28
3 Test air-valve sensors and sensor magnet
Rotate the air valve to the right and left,
and observe the status as you tap Open and
then Close on the Diagnostics menu.
Observe LED indicators marked D50 and D51 as the valve is
rotated and the sensor magnet moves between the sensors.
When the position of the small, round magnet is between the
two sensors, the status on the Diagnostics menu is “moving.”
When the position of the magnet is beneath either sensor, the
status appropriately moves to either “open” or “closed.”
If the sensors are not correctly conveying the status to the
Diagnostics read-out, replace the sensors.
If the D50 and D51 (end-of-travel LEDs) appropriately light
as the sensor magnet approaches the associated sensor, go
to the next step.
If either LED does not light, replace the associated sensor.
4 Observe the motor assembly while tapping
Open and then Close on the Diagnostics
menu.
Turning mechanism moves and rotates or attempts to rotate
the gear below it.
If the motor appears not to be working, replace it.
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