HMC
(
HOPF
M
ANAGEMENT
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ONSOLE
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SOFTWARE
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8024GPS - GPS Sync Module - V02.00
hopf
Elektronik GmbH
Nottebohmstr. 41
• D-58511 Lüdenscheid • Tel.: +49 (0)2351 9386-86 • Fax: +49 (0)2351 9386-93 • Internet: http://www.hopf.com • E-Mail: [email protected]
3.6.2 System
– Tab
3.6.2.1 SyncON / SyncOFF
These timers can be used to delay the change of status from QUARTZ to SYNC (SyncON
Timer) and from SYNC to QUARTZ (SyncOFF Timer).
The
SyncOFF
timer is used to bypass reception failure for operation free of fault messages in
difficult reception conditions.
In the event of a synchronization source reception failure (GPS in this instance), the re-
synchronization of the system to quartz status (QUEX) is delayed by the configured value. The
system continues to run in synchronous status (SYOF) on the internally regulated, highly
accurate quartz base during this period.
This setting depends primarily on the desired freewheel accuracy.
Example freewheel accuracy calculation
In order to calculate the maximum value to be set for the SyncOFF timer, the desired minimum
system accuracy is divided by the freewheel accuracy value of the quartz. If, for example, the
freewheel accuracy is 1x10E-6 and the desired minimum system accuracy is 5msec. the
following calculation results:
0.005s / 1x10E-6 = 5000s =
83 minutes 20 seconds
The
max
. value to be set for the SyncOFF timer is thus
83 minutes
.
The
SyncON
timer is used for systems operating on a highly accurate, regulated quartz base
to ensure that the system does not synchronize before the quartz base has been accurately
regulated. This timer should be set to
00 as default value
on Module 8024GPS.
Value range
SyncON
00 ... 30 min
SyncOFF
0002 ... 1440 min
