Section 4
1MAC050144-MB C
Protection functions
310
615 series ANSI
Technical Manual
When the thermal level exceeds the set value of the
Alarm thermal value
setting, the
ALARM
output is activated. Sometimes a condition arises when it becomes necessary to
inhibit the restarting of a motor, for example in case of some extreme starting condition
like long starting time. If the thermal content exceeds the set value of the
Restart thermal
val
setting, the
BLK_RESTART
output is activated. The time for the next possible motor
startup is available through the monitored data view from the
T_ENARESTART
output.
The
T_ENARESTART
output estimates the time for the
BLK_RESTAR
deactivation
considering as if the motor is stopped.
On the rising edge of the emergency start signal
START_EMERG
increases, the thermal
level is set to a value below the thermal restart inhibit level. This allows at least one motor
startup, even though the thermal level has exceeded the restart inhibit level.
When the thermal content reaches 100 percent, the
TRIP
output is activated. The
TRIP
output is deactivated when the value of the measured current falls below 12 percent of
Rated current
or the thermal content drops below 100 percent.
The activation of the
BLOCK
input blocks the
ALARM
,
BLK_RESTART
and
TRIP
outputs.
Содержание 615 Series ANSI
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