R.9.34
SEL-421 Relay Reference Manual Date Code 20111215
ASCII Command Reference
Description of Commands
If any of the RTDxTY Port Settings are set to NA, the relay displays the
following for that channel:
Channel Not Used
If the RTDxxST Relay Word bit is set for any of the RTDNUM channels being
reported, the relay displays the following:
Channel Failure
OACCESS
Use the OACCESS command to gain access to Access Level O (output). See
Access Levels on page U.4.6 for more information.
OPEN n
Use the OPEN n command to open a circuit breaker(s). The OPEN 1
command pulses Relay Word bit OC1, and the OPEN 2 command pulses
Relay Word bit OC2. Usually, you configure these Relay Word bits as part of
the SEL
OGIC control equations that trip the appropriate circuit breaker. The
factory default manual trip SEL
OGIC control equation, BK1MTR, includes
OC1. Typically, you program Relay Word bit OC2 in the manual trip SEL
OGIC
control equation BK2MTR. See Trip Logic on page R.1.105 for information
on trip SEL
OGIC control equations.
If you have disabled the relay and attempt an OPEN n command, the relay
responds,
Command aborted because the relay is disabled. If the circuit
breaker control enable jumper J18C is not in place, the relay aborts the
command and responds,
Aborted: the breaker jumper is not installed.
For information on placing relay jumpers, see Password and Circuit Breaker
Jumpers on page U.2.18.
When you issue the OPEN 1 command, and the circuit breaker control enable
jumper is in place, the relay responds,
Open breaker (Y/N)? If you answer
Y <Enter>, the relay responds,
Are you sure (Y/N)? If you answer
Y <Enter>, the relay asserts OC1 for one processing interval. Circuit
Breaker 1 opens if you have programmed Relay Word bit OC1 in the TR
SEL
OGIC control equation.
If you have assigned auxiliary contact 52A inputs for this circuit breaker
(based on settings 52AA1, 52AB1, and 52AC1), the relay waits 0.5 seconds,
checks the state of the breaker auxiliary contacts, and responds
Breaker OPEN
or
Breaker CLOSED, as appropriate.
A similar procedure holds for the OPEN 2 command and Circuit Breaker 2.
To successfully issue the OPEN 2 command, setting NUMBK must be 2. If
setting NUMBK is 1, the relay responds,
Breaker 2 is not available.
Table 9.86 OAC Command
Command Description Access Level
OAC Go to Access Level O (output). 1, B, P, A, O, 2
Table 9.87 OPEN n Command
Command Description Access Level
OPEN 1 Change Relay Word bit OC1 to logical 1. B, P, A, O, 2
OPEN 2 Change Relay Word bit OC2 to logical 1. B, P, A, O, 2
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