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A EN 11/37
1KHW001493-EN
9. If no minimum could be achieved with LA to LN, reduce the level using jumpers CA –
CN until the next minimum is reached. The capacitors are binary weighted with CA the
smallest and CN the largest capacitor. C jumpers may be inserted in parallel.
Conclude the tuning by adjusting R226 for the next minimum.
Click Stop measurement and Cancel to close the dialog box.
)
Note: The transhybrid loss that has been achieved by tuning the hybrid is
equal to the increase of the measured RF level when the RF cable is
unplugged. If it is higher than 20 dB, the tuning can be considered as
successful and may be terminated.
B.6.5 Link alarm indication
Trigger the link alarm by interrupting the RF connection (disconnecting the RF line coaxial cable).
After the programmed delay time the link alarm relay on P4LT/P4LU operates. The relay contacts,
terminals 5 and 6 at the cable V9OT, are closed. Now restore the RF connection. The Alarm LED’s
goes OFF and the contacts will open after the programmed delay.
B.7 Testing of R1BC, if present
For testing the R1BC, refer the client specific setting instructions. Depending upon the programmed
criteria, activate the required alarms using the following table. Check the contact closure of the
programmed relays on R1BC. Restore the link after this test is completed.
Alarm on R1BC Action to enforce the alarm
Warning LED on P4LT/P4LU Activate a testtone in the ‘Adjust Tx RF level’ dialog box
Link alarm Disconnect the RF line coaxial cable
Hardware (HW) alarm Unplug the RF hybrid.
Interface alarm,
P4LT alarm / P4LU alarm
In case an external real time clock is configured and
connected: Disconnect the clock input to P4LT/P4LU.
In case no external real time clock is configured: Configure
it (dialog box ‘Configuration / System / Channel settings /
Event recorder: Ext. real time clock sync available’).
System alarm (i.e. cabinet alarm) Enforce either Link alarm or HW alarm
B.8 Configure Real Time Clock (RTC)
The real time clock has to be set to the actual date and time for proper operation of the event
recorder.
B.8.1 Setting real time clock
Setting the date and time using HMI600:
1. On the Equipment menu, click Commissioning and maintenance, click Eventrecorder and
click Set Clock.
2. In the Real Time Clock (RTC) dialog box, check if PC time and PC date are correct.
3. Click Download date/time to RTC
This sets the RTC to the given date and time.
4. Click Upload date/time from RTC
The date and time displayed at Read RTC date & time part of the Real Time Clock (RTC)
box should be correct.
5. Click Cancel
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