10-34 Serial Port Communications and Commands Date Code 20001006
SEL-351 Instruction Manual
GRO n Command (Change Active Setting Group)
The GRO n command changes the active setting group to setting Group n. To change to settings
Group 2, enter the following:
==>GRO 2 <ENTER>GRO 2 <ENTER>
Change to Group 2
Are you sure (Y/N) ? Y <ENTER>Y <ENTER>
Active Group = 2
==>
The relay switches to Group 2 and pulses the ALARM contact. If the serial port AUTO
setting = Y, the relay sends the group switch report:
==>
FEEDER 1 Date: 02/02/97 Time: 09:40:34.611
STATION A
Active Group = 2
==>
If any of the SELOGIC Control Equations settings SS1 through SS6 are asserted to logical 1, the
active setting group may not be change with the GRO command – SELOGIC Control Equations
settings SS1 through SS6 have priority over the GRO command in active setting group control.
For example, assume setting Group 1 is the active setting group and the SS1 setting is asserted to
logical 1 (e.g., SS1 = IN1 and optoisolated input IN1 is asserted). An attempt to change to setting
Group 2 with the GRO 2 command will not be accepted:
==>GRO 2 <ENTER>GRO 2 <ENTER>
No group change (see manual)
Active Group = 1
==>
For more information on setting group selection, see Multiple Setting Groups in Section 7:
Inputs, Outputs, Timers, and Other Control Logic.
OPE Command (Open Breaker)
The OPE (OPEN) command asserts Relay Word bit OC for 1/4 cycle when it is executed. Relay
Word bit OC can then be programmed into the TR SELOGIC Control Equation to assert the TRIP
Relay Word bit, which in turn asserts an output contact (e.g., OUT1 = TRIP) to trip a circuit
breaker. See Figure 5.1.
See the Note following Figure 5.2 and the Note in the Lockout State discussion, following
Table 6.1, for more information concerning Relay Word bit OC and its recommended use, as used
in the factory settings.
Courtesy of NationalSwitchgear.com
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