A
Systematic troubleshooting
Start troubleshooting
Supply voltage within the
tolerance specifications?
Initiate function test (run test function) Via DIAG
menu 4
Damper blade first moves to positions OPEN and then
to the control position.
(takes a few minutes; monitor process) Display shows
tSt for the entire process.
No
No
No
Yes
Check wiring, transformer
Troubleshooting VAV terminal units with Compact controller XM0 and XS0 Status 04.03.2021
Mechanische Überprüfung
- Check that the control component is seated corrected on
the basic device
- Remove the control component from the basic device.
See Fig. 29
Yes
bLc
rEF
tSt
circle
Hi, Lo,
oP, cL
E C
Check mechanical block
of the actuator and
repair if necessary.
Yes
No
No
No
No
Wait for synchronisation.
Test mode activated.
Deactivate test mode or wait
for test to be completed.
Overpressure of sensor.
Reduce system
pressure.
Override control active.
Deactivate override control.
Call TROX service technician
No
Yes
Yes
Yes
Yes
Yes
Damper blade
reaches the "OPEN"
position first?
Damper blade reaches control position?
Damper blade position?
No
Check system pressure
Minimum differential pressure maintained?
Duct section shut off/fire damper closed?
- Sensor openings dirty (damper blade)
- Check setpoint value setting (Bus/analogue)
Open
Closed
Check q
vmin
Check q
vmin
setting und setpoint value setting and
correct if necessary
Actual value consistent with setpoint
value setting?
- Tolerance observation controller vs. Measuring tolerance
- Check control ranges
- Check wiring
- Check airflow direction (only for XS0)
- Check for dirt
No
Controller OK
Yes
Take note of display ASCII code!
See Chapter 6.4
Yes
Systematic troubleshooting
Control component Compact XM0 • XS0 for VAV terminal unit TVE
44
