SIRIUS 3RF34 solid-state switching devices
3.5 Planning/configuring
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
333
● Motor parameters
– "Nominal current of motor"
The "Nominal current of motor" is indicated on the motor's nameplate.
– "Operating current of motor"
This value is the current actually consumed during the operating phase; a
measurement may need to be taken in order to ascertain it. Alternatively, this value
can be estimated on the basis of the load data.
– "Starting current factor of motor"
The value has to be taken from the motor's technical data. It essentially determines
the current load of the switching device during starting.
– "Starting time"
This is the time the motor needs to complete a startup process.
● "Load cycle input"
A load cycle comprises a starting phase, an operating phase and an idle phase.
The load cycle time is the sum of these phases. There are two possible ways of entering
the load cycle.
One is to enter the operating cycles and the duty cycle, the other is to enter the operating
time and the idle time.
– "Operating cycles"
The number of load cycles in an hour; in the case of reversing contactors every load
cycle counts, regardless of counterclockwise or clockwise running.
– "Duty cycle"
Ratio of the sum of the starting time and the operating time to the total load cycle time.
– "Operating time"
Time during which the rated motor current flows.
– "Idle time"
Duration of the current-free phase.
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