jraef
Member
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!
Running motors for 10 seconds
- Thread starter icemaker
- Start date
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.
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.
Nova5
Member
Alright maybe someone in their right mind would..
drbitboy
Lifetime Supporting Member
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.
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