ABB AC 800F Mounting And Installation Instructions Manual page 308

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8.3.5 Diagnosing a AC 800F with radio clock
The connected radio clock occupies the Diag interface of the AC 800F, which is nor-
mally intended to be used for diagnosis. Proceed as described below to connect a di-
agnostic terminal to a AC 800F with radio clock:
•
Disconnect the radio clock connection cable from the Diag interface of the
AC 800F.
Connecting a PC that is switched off or has an improperly config-
ured ser. interface will cause malfunctions of the AC 800F.
•
Plug the diagnostic cable into the AC 800F and perform the diagnosis.
•
When the diagnosis is complete, connect the radio clock cable again.
The cables can be connected and disconnected while the system is running. During
diagnosis the internal clock of the AC 800F takes over time synchronization of the
Freelance 2000 system. After re-connection of the radio clock the internal time of the
Freelance 2000 system follows the received time signals, again.
8.4 Connecting the GPS satellite radio clock to the AC 800F
8.4.1 GPS satellite radio clock 6841
As an alternative to the external DCF77 radio clock, an external GPS (Global Posi-
tioning System) radio clock from Hopf (manufacturer) can be connected to the
AC 800F. The connection to the AC 800F is established through the Diag interface of
the power supply module.
The satellite radio clock is installed in a separate rack with half 19" size (241.3 mm) or
full 19" size (482.6 mm). GPS data reception requires an external antenna with a "free
line of sight" over the full horizon.
The antenna is connected via a coax. cable with a standard length of 25 m (50 m for
special cable). With longer cables of max. 150 m a GPS line amplifier must be con-
nected into the antenna line. An indirect lightning protector must be installed at a
maximum distance of 1 meter from the coax. cable house lead-in.
With the GPS satellite radio clock the exact time can be provided worldwide. The GPS
satellite radio clock is a good solution if no DCF77 signal can be received.
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