Relative duty cycle tr= = · 100
tA= starting time s, min ts
= cycle duration in s, min
t
r
= relative duty cycle in % tB= load period in s, min
t
St
= stop period in s, min
Identification: by the relative duty cycle t
rin %, number ZLof
starts per hour and power P
- Example: S4: 25%, 500 starts per hour, 11 kW
- plus information on the moment of inertia of the motor and load JMand J
ext
during startin