Setting of Cumulative time Lim
Cumulative time Lim is calculated by
t n t margin
si
∑
= − × +( )1
GUID-0214B677-48D0-4DD4-BD1E-67BA9FD3C345 V1 EN (Equation 73)
n specified maximum allowed number of motor startups
t startup time of the motor (in seconds)
margin safety margin (~10...20 percent)
Setting of Counter Red rate
Counter Red rate is calculated by
GUID-E7C44256-0F67-4D70-9B54-1C5042A151AF V1 EN (Equation 74)
t specified start time of the motor in seconds
t
reset
duration during which the maximum number of motor startups stated by the manufacturer can
be made; time in hours
4.8.6 Signals
Table 445: STTPMSU Input signals
Name
Type Default Description
I_A SIGNAL 0 Phase A current
I_B SIGNAL 0 Phase B current
I_C SIGNAL 0 Phase C current
BLOCK BOOLEAN 0=False Block of function
BLK_LK_ST BOOLEAN 0=False Blocks lock out condition for restart of motor
CB_CLOSED BOOLEAN 0=False Input showing the status of motor circuit breaker
STALL_IND BOOLEAN 0=False Input signal for showing the motor is not stalling
ST_EMERG_ENA BOOLEAN 0=False Enable emergency start to disable lock of start of
motor
Table 446: STTPMSU Output signals
Name
Type Description
OPR_IIT BOOLEAN Operate/trip signal for thermal stress.
OPR_STALL BOOLEAN Operate/trip signal for stalling protection.
MOT_START BOOLEAN Signal to show that motor startup is in progress
LOCK_START BOOLEAN Lock out condition for restart of motor.
Section 4 1YHT530004D05 D
Protection functions
530 615 series
Technical Manual
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