Manual Loop Test; Local Test Mode; Command Counters - ABB ETL600 Instruction Manual

ABB Switzerland Ltd
The signal used for this test has the same parameters as the
command with the highest application requirements regarding security.
3.6.8.14.

Manual Loop Test

The loop test can also be initiated manually from any station via the
HMI600. The result of the test can be viewed in a window. The actual
measured transmission time is displayed (half the value of both
directions there and back, plus a delay for one input and one output
circuit of a teleprotection interface type G4AI, which can not be
included in this test).
If the reflection of a manually transmitted test signal is not correctly
received, it is correspondingly displayed in the loop test window.
Note:
The signal used for this test has the same parameters as the
command with the highest application requirements regarding security.
A manually initiated loop test is transmitted in the same way as the
cyclic loop test.
3.6.8.15.

Local Test Mode

Each NSD600 can separately be set via HMI600 to a local operating
mode for checking the relay interfaces, e.g. for measuring the
command prolongation.
In this operating mode, which is indicated by the 'warning' LEDs and
via the HMI600 by the alarm message 'LOCAL TEST MODE', the
command input signal is looped via the TDM-bus by the TPE
processor on the RF converter P4LT back to the corresponding
command output of the same local teleprotection equipment.
Commands can for example be initiated from the protection relay
(separated from the protected objects!) or with the help of external
contact and battery voltage.
Caution
3.6.8.16.

Command Counters

For both TPE an individual counter is incremented and stored in the
non-volatile memory for each transmitted and received command as
well as for the unblocking condition and the activation of the start
signal via the configured input(s).
3-84
1KHW001489-EN
If a pick-up time for the command inputs is
programmed (Tx Input Command Delay; refer to
section 3.6.8.6.2), it is not included in the measured
transmission time !
During the test
continuously transmitted to the opposite station.
Commands can not be transferred between the
stations when the equipment is in the local test
mode.
November 2005
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Structure and Function
ETL600
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