D-oh! Kinda more like a brain ****... I happen to be working on another project that is 10 S/Hr and we are de-rating the motor. Every 10 seconds is 360 starts-per-hour!
We have machines that are fed by a conveyor that runs for 3 seconds every 6.5 seconds. Nothing unusual about that.
It is a trivial thing. You have to derate the motor by taking the no of starts per hour into account.
Small motors are never a problem, we had over 20 conveyors (indexing) 0.75kw driven by inverters with smallest ramp up/down times, these would index at a rate of 60 indexes per minute i.e. probably 0.5 second index 1.5 second stop, over 16 years probably only replaced about 5 or 6 motors due to mainly gearbox wear, we only replaced about 2 inverters during that time.
Have investigated it a little further.
Cant really find any guidelines.
For us it is DOL and usually 3 kW.
For severe cases, i.e. frequent starts and hard start, and/or high ambient temperature, we had to use forced cooling.
DOL contactors have to be replaced more frequently.
We have machines that are fed by a conveyor that runs for 3 seconds every 6.5 seconds. Nothing unusual about that.
It is a trivial thing. You have to derate the motor by taking the no of starts per hour into account.
It appears OP has checked out; perhaps the assignment deadline has passed or they figured it out on their own. The continuous toggle can be done with two instructions, plus the three I/O blocks; with dwell (motor start delay) it can be in three instructions.