-ETHOD OF OPERATION3*
6
#
' #
4HE TIME OF THERMAL EQUILIBRIUM 4 %15!, IS STARTED
EACH TIME THE MOTOR IS SWITCHED OFF 4HE THERMAL REP
LICA IS NOT ACTUALIZED DURING THIS TIME BUT KEPT CON
STANT IN ORDER TO SIMULATE TEMPERATURE EQUALIZING
4HE TOTAL LOCKOUT TIME IS COMPOSED OF THE TIME CALCU
LATED BY THE THERMAL REPLICA PLUS THE TIME OF EQUILIBRI
UM 4 %15!, AS EXPLAINED BEFORE 4 %15!, CAN ALSO
BE SET SO ZERO
4HE HIGHER COOLING
DOWN TIME CONSTANT DURING
STAND
STILL OF A SELF VENTILATED MACHINE CAN BE CON
SIDERED BY A FACTOR KÇ )N THIS ASPECT THE MOTOR IS AS
SUMED TO STAND STILL WHEN THE CURRENT CONSUMPTION
IS LESS THAN THE SETTABLE THRESHOLD ) "2+
#,/3%$
)N CASE OF FORCED
VENTILATED MACHINES IS K
Ç
)F FOR OPERATIONAL REASONS IT BECOMES UNAVOIDABLE
THAT THE MOTOR BE STARTED REGARDLESS OF ITS THERMAL
STATE EMERGENCY START THE LOCK
OUT SIGNAL CAN BE
BLOCKED VIA A BINARY INPUT
-30 EMERG ST OF
THE RELAY 4HUS RESTART IS PERMITTED 4HE THERMAL REP
LICA OF THE PROTECTION CONTINUES ITS CALCULATION SO THAT
THE SIMULATED MAXIMUM ROTOR TEMPERATURE CAN BE
EXCEEDED 4HE MACHINE BREAKER IS NOT TRIPPED BUT
THE CALCULATED TEMPERATURE RISE CAN BE OBSERVED IN
THE OPERATIONAL MEASURED VALUE IN ORDER TO ESTIMATE
THE RISK
7HEN THE RESTART LOCKOUT PROTECTION IS BLOCKED OR
SWITCHED OFF THE THERMAL REPLICA AND THE TIMER 4
%15!, ARE RESET TO ZERO ! STANDING LOCKOUT COM
MAND IS CANCELLED
&IGURE SHOWS THE LOGIC DIAGRAM OF THE RESTART
LOCKOUT
,
T
-30
31
2
ON
-30 BLOCK
-30 OFF
OFF
-/434!24
-30 4RIP
-30 ACTIVE
4 %15!,
31
2
%MERGENCY
START
,
T CALCULATE
,
&.O
)
,
)
,
)
,
)
#" CLOSED
MOTOR RUNNING
)
MAX
&!#4/2
KÇ
&.O
-30 EMERG ST
&.O
&.O
&.O
4 %15!,
&UNCTION NUMBER
ANNUNCIATION
"LOCK MOT START
LOCKOUT
-30 OFF
-30 ON
0ARAMETER
&IGURE ,OGIC DIAGRAM OF THE MOTOR START UP LOCKOUT
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