28
Operation
T801-4 Installation and Operation Manual
© Tait Electronics Limited September 2007
2.1
System Start-up and Shutdown
The T801-4 will start up as soon as DC power is applied. The associated
GPS receiver(s) should be powered from the same supply so that they start
up and shut down at the same time.
Note
Because of the time it takes the GPS receivers to acquire a fix,
especially the Dalman external GPS receiver (refer to
“GPS Fix
Acquisition Times” on page 31
), it is very probable that an alarm
condition will occur after power-up, but before a fix is acquired.
This is quite normal. However, you can delay the response time
of the alarms by a variable time period so that the system does not
raise alarms during power-up (refer to
“Fault Output Delay” on
page 33
).
The T801-4 has two modes of operation, run mode and programming
mode. The unit defaults to run mode whenever power is applied, and is
only ever in programming mode (briefly) when you apply configuration
settings using the ET software.
2.2
Loss of Power
If power is lost to the T801-4, the Satsync 7 module saves its configuration
information and the oscillator control voltage value in non-volatile memory.
These are re-applied when power is restored.
However, the frequency updating process does not start until a few minutes
after power is restored. This is to allow the oven to reach its operating
temperature and ensure that the oscillator is close to the correct running
temperature/frequency relationship. The length of time before the updating
process re-starts is related to the frequency error when power was lost.
If required, you can save the Satsync 7 configuration settings to a file using
the ET software (refer to
“Settings Menu” on page 41
).
