ABB RELION 620 Series Technical Manual page 625

1MAC504801-IB E
620 series ANSI
Technical Manual
GUID-6E9B7247-9009-4302-A79B-B326009ECC7A V2 EN
Figure 316: Typical motor-starting and capability curves
Setting of Cumulative time Lim
Cumulative time Lim is calculated by
∑
t = ( n − × + ) 1 t margin
si
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n specified maximum allowed number of motor start-ups
t start-up time of the motor (in seconds)
margin safety margin (~10...20 percent)
Setting of Counter Red rate
Counter Red rate is calculated by
t
∑
∆ t =
s
t
reset
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t specified start time of the motor in seconds
t duration during which the maximum number of motor start-ups stated by the manufacturer can be
reset
made; time in hours
Section 6
Supervision functions
(Equation 93)
(Equation 94)
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