POS MV V5 Installation and Operation Guide
Fault
Identification
9-28
4. If
IMU Status
shows
OK
, check IMU base plate is mounted in nominal horizontal orientation. If
necessary, adjust installation to make base plate of IMU as close to horizontal as possible.
5. If problem still exists, contact Applanix for instructions to return POS MV system for evaluation
and repair.
GNSS Not Available
When the POS MV system is powered-on, the GNSS receivers require approximately two minutes to
acquire satellites and to begin computing a navigation solution. During this time, the
Nav Status
display
on the controller main window shows
DR
.
If this status does not change after several minutes, or if the status changes from a valid mode to
DR
and
remains unavailable, there is likely a problem with the GNSS subsystem.
There are two classes of GNSS problems associated with the POS MV:
a) A communication fault between the receiver and the PCS
b) The receivers are not tracking a sufficient number of satellites
Improper Communication
Note
: The GNSS lights are controlled by the navigation software; the system must be in the navigate
mode for the proper indication of the GNSS lights.
Follow the instructions below to identify a communications fault:
1. Examine GNSS light on PCS front panel:
•
If light shows red, there is no communication between PCS and GNSS receiver. Follow
instructions relating to loss of GNSS communications in Status Warning Messages on
page 9-14 and the following step below.
•
If light shows amber or green, select
View, GNSS Data
from controller menu bar; see
Figure 55 on page 8-2.
•
If
GNSS Data
window shows system is tracking fewer than four satellites, go to
Insufficient Satellites on page 9-29.
2. Select
Diagnostics, Primary GNSS
from controller menu bar and check that messages are
being received, see Figure 74. If no, fault may be in GNSS receiver or in communications
between GNSS and PCS. Please contact Applanix Customer Support, see page A-1.