Schweitzer Engineering Laboratories SEL-421-4 - Page 1248

14.42
SEL-400 Series Relays Instruction Manual Date Code 20171006
ASCII Command Reference
Command Description
WARNING
OPEN n
Use the OPEN n command to open a circuit breaker(s). The OPEN n command
pulses Relay Word bit OCn. Usually, you configure these Relay Word bits as part
of the SEL
OGIC control equations that trip the appropriate circuit breaker. See
Trip Logic in Section 5: Protection of the product-specific instruction manual 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 BREAKER is not in place, the relay aborts the
command and responds,
Aborted: the breaker jumper is not installed.
When you issue the OPEN n 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 OCn for one processing interval.
If you have assigned auxiliary contact 52A inputs for this circuit breaker, the
relay waits 0.5 seconds, checks the state of the breaker auxiliary contacts, and
responds
Breaker OPEN or Breaker CLOSED, as appropriate.
If Breaker n is not enabled, the relay responds,
Breaker n is not available.
PACCESS
Use the PACCESS command to gain access to Access Level P (protection). See
Access Levels and Passwords on page 3.7 for more information.
PASSWORD
Use the PASSWORD command to control password protection for relay access levels.
PAS level
The relay changes the existing password for the specified access level that you
specify when you issue the PAS level command.
This device is shipped with default
passwords. Default passwords should
be changed to private passwords at
installation. Failure to change each
default password to a private pass word
may allow unauthorized access. SEL
shall not be responsible for any damage
resulting from unauthorized access.
Ta b l e 1 4.96 O P E N n Command
Command Description Access Level
OPEN n Pulse Relay Word bit OCn. B, P, A, O, 2
Table 14.97 PAC Command
Command Description Access Level
PAC Go to Access Level P (protection). 1, B, P, A, O, 2
Ta b l e 1 4.98 PAS level New_Password Command
Command Description Access Levels
PAS n Set a new password for Access Level n.2