10.35
Date Code 20080213 Instruction Manual SEL-351A Relay
Serial Port Communications and Commands
Command Explanations
The CLO command is supervised by the main board Breaker jumper (see
Table 2.5 and Table 2.6). If the Breaker jumper is not in place (Breaker jumper
= OFF), the relay does not execute the CLO command and responds:
Aborted: No Breaker Jumper
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>
Change to Group 2
Are you sure (Y/N) ? 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: 08/10/99 Time: 09:40:34.611
STATION A
Active Group = 2
==>
If any of the SELOGIC control equations settings SS1–SS6 are asserted to
logical 1, the active setting group may not be change with the GRO
command—SEL
OGIC control equations settings SS1–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 = IN101 and optoisolated input IN101
is asserted). An attempt to change to setting Group 2 with the GRO 2
command will not be accepted:
==>GRO 2 <Enter>
No group change (see manual)
Active Group = 1
==>
For more information on setting group selection, see Multiple Setting Groups
on page 7.18.
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
SEL
OGIC control equation to assert the TRIP Relay Word bit, which in turn
asserts an output contact (e.g., OUT101 = TRIP) to trip a circuit breaker. See
Figure 5.1.
See the Note near Figure 5.2 and the Note in Lockout State on page 6.13,
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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