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1MAC050144-MB C
Section 7
Control functions
615 series ANSI
487
Technical Manual
Figure 259:
Master and slave scheme
If the AR unit is defined as a master by setting its terminal priority to high:
• The unit activates the
CMD_WAIT
output to the low priority slave unit whenever a
shot is in progress, a reclosing is unsuccessful or the
BLK_RCLM_T
input is active
• The
CMD_WAIT
output is reset one second after the reclose command is given or if
the sequence is unsuccessful when the reclaim time elapses.
If the AR unit is defined as a slave by setting its terminal priority to low:
• The unit waits until the master releases the
BLK_RECL_T
input (the
CMD_WAIT
output in the master). Only after this signal has been deactivated, the reclose time for
the slave unit can be started.
• The slave unit is set to a lockout state if the
BLK_RECL_T
input is not released within
the time defined by the
Max wait time
setting , which follows the initiation of an
autoreclose shot.
If the terminal priority of the AR unit is set to "none", the AR unit skips all these actions.
7.2.3.4
Thermal overload blocking
An alarm or pickup signal from the thermal overload protection 49F can be routed to the
input
BLK_THERM
to block and hold the reclose sequence. The
BLK_THERM
signal does
not affect the starting of the sequence. When the reclose time has elapsed and the
BLK_THERM
input is active, the shot is not ready until the
BLK_THERM
input deactivates.
Should the
BLK_THERM
input remain active longer than the time set by the setting
Max
block time
, the AR function goes to lockout.
If the
BLK_THERM
input is activated when the auto wait timer is running, the auto wait
timer is reset and the timer restarted when the
BLK_THERM
input deactivates.
7.2.4
Operation principle
The function can be enabled and disabled with the
Operation
setting. The corresponding
parameter values are Enable and Disable.
The reclosing operation can be enabled and disabled with the
Reclosing operation
setting.
This setting does not disable the function, only the reclosing functionality. The setting has
three parameter values: “Enable”, “External Ctl” and ”Disable”. When the setting value
“External Ctl” is selected, the reclosing operation is controlled with the
RECL_ON
input .
The operation of the autoreclosing function can be described by using a module diagram.
All the modules in the diagram are explained in the next sections.
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