ABB ETL600 Instruction Manual page 336

Revision:
A
Note:
Note:
Note:
3. After all adjustment steps have been executed, click Cancel to close the dialog box.
4. Restore the link by connecting the RF line coaxial cable and plug in the Rx filter P4RX.
C.6.2 Connect RF cable and set alarm thresholds
Now connect the RF cable to the ETL600.
If the remote equipment is operational, set the alarm thresholds:
1. On the Equipment menu click Upload status.
2. On the Configuration menu click System... and then click the Alarm settings tab.
Language:
EN
In case of a large frequency gap between Tx and Rx frequency bands:
- the rated level in the second adjustment step can be up to 40 dB higher than in
the first adjustment step,
- the rated level in the second adjustment step can't be attained when the Rx pot
reaches its stop position during adjustment.
If in doubt about the effective line attenuation, enter the lowest possible attenuation.
The increase of the receive level due to parallel PLC links can be calculated as
follows:
[ ]
= ∗
G dB 20 log
Each term of the summation is the contribution of one parallel PLC link and is given
by
P
= PEP of the local transmitter of the i-th parallel link,
i
P
= PEP of the local ETL600 transmitter,
0
=
H ( d )
i
−
2
1 ( d
i
⎛ ⎞
f f
⎜ ⎜ ∗ ⎟ ⎟
= −
i 0
d
i
⎝ ⎠
f f
0 i
f
= Lower edge frequency of the nominal Tx band of the local transmitter of the
i
i-th parallel link, if this band is above the frequency band of the local ETL600
receiver
or
Upper edge frequency of the nominal Tx band of the local transmitter of the
i-th parallel link, if this band is below the frequency band of the local ETL600
receiver,
f
= Center frequency of the Rx-filter of the local ETL600 terminal
0
or – if no Rx-filter is used –
Center frequency of the Tx-filter of the local ETL600 terminal,
B
= Bandwidth of the Rx-filter of the local ETL600 terminal
0
or – if no Rx-filter is used –
Bandwidth of the Tx-filter of the local ETL600 terminal,
=
K 0 9 .
.
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⎛ −
( P P )
N
i 0
∑
⎜
+ ∗
20
1 10
⎜
⎝
=
i 1
∗
2 K
+ + ∗
2
2 2
K ) 4 d
i
f
0
,
∗
1 5 . B
0
1KHW001495-EN
⎞
⎟
H ( d )
⎟
i
⎠
,