ABB ETL600, Instruction Manual

Page: 109 / 382

ETL600 1KHW001489-EN
ABB Switzerland Ltd
It may be necessary to select some teleoperation channels to be 'not
disconnectable' later, the boost ratio is accordingly decreased then by
the HMI600 (a corresponding warning note will appear on the screen).
Since both TPE interrupt the DPLC channel and all disconnectable
signals in all channels for command transmission (including speech
and pilot signals that are not used as TPE guard signals), much higher
boost ratios are possible compared to earlier PLC systems. However,
the
maximum boost ratio
is limited to
18 dB
, it can be decreased via
HMI600 to a value between the
minimum boost ratio
(which depends
on the difference between the guard and the test tone level; can vary
from 0 dB to 6 dB) and the
calculated boost ratio
established by the
HMI600 (depends on the services that are configured and can be
switched off; can vary from the minimum boost ratio up to 18 dB).
If two internal TPE are configured, both NSD600 have the same
weight, i.e. they can use half of the disconnectable weight for boosting
their signals.
Further information on boosting is to be found in section 5.2.16 in this
instruction manual.
Note:
The NSD600 loop test is performed at the test level
of 0 dBm0 or at guard signal level (whatever is
higher; i.e. if the guard level is between –6 dBm0 and
0 dBm0, the minimum boost ratio is between 6 dB
and 0 dB).
The loop test is thus performed under more exacting
conditions than those of boosted tripping signals
3.6.8.6. Input/Output Command Handling
3.6.8.6.1. General
The following parameters are selectable for each command by means
of the HMI600:
•
Tx Input Command Delay (0…10 ms, step 1 ms; default 0 ms)
•
Tx Input Command Prolongation (0…3000 ms, step 1 ms; default
0 ms for all applications)
•
Tx Trip Duration Monitoring (1…60 s, step 1 s; default 5 s)
•
Rx Output Command Duration (30…1000 ms, step 1 ms; default =
as long as received and eventually prolongated, refer to the
explanations below)
•
Rx Output Command Prolongation (0…3000 ms, step 1 ms; default
blocking 0 ms, permissive 10 ms, direct 100 ms)
•
Rx Trip Duration Monitoring (1…60 s, step 1 s; default 5 s)
The following picture illustrates the miscellaneous parameters, except
Tx and Rx Trip Duration Monitoring (the delay introduced by the input /
output circuits of G4AI and by the TDM-bus processing is
disregarded):
Structure and Function November 2005 3-77