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4 Troubleshooting
4.1 General Software Issues
Q1 When I try to open a QNET HVAC VI, it says there are some missing VIs and they have a CD or Sim in the
name?
The LabVIEW™ Control Design and Simulation Toolkit is not installed.
Q2 When I open a QNET HVAC VI a message prompts that a VI with ''ELVIS'' in the name cannot be found?
The QNET HVAC VIs use the ELVISmx drivers. Make sure you install the contents of the NI ELVIS II
before attempting to open any of the QNET HVAC VIs (available for download at www.ni.com).
4.2 General Hardware Issues
Q1 None of the LEDs on the QNET HVAC board are lit.
Make sure both the System Power switch, which is located on the back of the NI ELVIS II
Prototyping Board Power switch, which is situated on the top-right corner of the NI ELVIS II
Q2 On the QNET HVAC board, the +15 V, 15 V, and +5 V LEDs are bright green but the External Power LED is
not lit.
Ensure the QNET HVAC power connector on the QNET HVAC board is connected with the supplied QNET
HVAC power cable. If the LED is still not lighting up, check the 2.5 A fuse of the QNET HVAC next to the power
connector. If it is burnt, replace it with an identical fuse (Schurter 0034.3121, 5 mm × 20 mm, 2.5 A, 250 VAC,
time-lag fuse). To remove the fuse, push and turn the fuse holder counter-clockwise.
Q3 At least one of the +15V,
• See
Q2
above if only the External Power LED is not lit.
• If one or more of the +15V,
Board of the NI ELVIS II
connecting the QNET HVAC power, the Variable Power Supplies Fuses on the NI ELVIS II
Board have been triggered. See the Protection Board Fuses in the NI ELVIS II
Q4 The Ready LED on the elvis does not go on.
(a) Go through the elvis setup procedure outlined in the QNET HVAC Setup Guide
(b) Once completed, launch the Measurement & Automation Explorer software.
(c) As illustrated in
the NI ELVIS II
(d) As shown in
Figure
(e) Once successfully reset, click on the Self-Test button.
(f) If the test passed, reset the elvis (i.e. shut off the Prototyping Board switch and System Power switch
and turn them back on again). The Ready LED on the elvis should now be lit.
15V, +5V and External Power LEDs on the QNET HVAC board is not lit.
15V, and +5V LEDs is not lit then a ±15V or +5V fuse(s) on the Protection
(+)
has been triggered. Similarly, if the External Power LED is still not lit after
Figure
4.1, expand the Devices and Interfaces and NI-DAQmx Devices items and select
(+)
device.
4.1, click on the Reset Device button.
(+)
(+)
, are ON.
(+)
User Manual.
QNET HVAC - User Manual
(+)
CD
unit, and the
(+)
Protection
14
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