Toshiba GRL150-100 Series Instruction Manual page 143

[RL-MODE]. When "Auto" is selected, the optimum signal receiving level, which has the least CF
(Communication Failure), is automatically set according to the receiving level (peak value). The
"Auto" is generally selected in normal operation. However, if a severe noise environment prevents
correct operation of GRL150, then "Manual" can be selected and the receiving level is chosen
manually. (See Section 3.3.5, 4.2.3.4 and 4.2.6.5.)
To set manual receiving level to the optimum value, the following procedure is to be followed:
1. In 'Setting Change → Protection → Change Set → Group 1 → Telecomm → Scheme Sw'
menu, set [RL-Mode] to 'Manual'.
2. In 'Status → Metering → Current' menu, record the value of the receiving level 'RL'.
3. In 'Setting Change → Protection → Change Set → Group 1 → Telecomm → Threshold Set'
menu, set the manual receive level, M-RL, to 0.5 × RL value recorded in 2.
4. In 'Record → Counter → Display' menu, record value of communication failures per period,
CF-L.
5. Vary the value of M-RL in increments, recording the CF-L values at each stage.
6. The value of M-RL that should be used as the final setting is that at which the lowest value of
CF-L is recorded.
Input current at a remote terminal relay. Check the current by the "Metering" screen from the
"Status" sub-menu at the local relay.
6.6.3 Tripping Circuit Test
The tripping circuit including the circuit breaker is checked by forcibly operating the output relay
and monitoring the circuit breaker to confirm that it is tripped. Forcible operation of the output
relay is performed on the "Binary O/P " screen of the "Test" sub-menu as described in Section
6.4.3.
• Set the breaker to be closed.
• Select "Binary O/P" on the "Test" sub-menu screen to display the "Binary O/P" screen.
• Enter 1 for TP1 and press the ENTER key.
• Press the END key. Then the LCD displays the screen shown below.
/ 2 B i n a r y
T P 1
D i s a b l e / E n a b l e
T P 2
D i s a b l e / E n a b l e
B O 1
D i s a b l e / E n a b l e
B O 2
D i s a b l e / E n a b l e
B O 3
D i s a b l e / E n a b l e
B O 4
D i s a b l e / E n a b l e
B O 5
D i s a b l e / E n a b l e
F A I L
D i s a b l e / E n a b l e
⎯
142
O / P
0 _
0
0
0
0
0
0
⎯
6 F 2 S 0 8 2 8