Power consumption?!!!

Hi dear collegous 

 I hope you are doing well. As I knew the general formula for power is: P in= P out +P loss.

I have seen that the word power consumption at any datasheet of for example signal modules or...  of Siemens. 

Now I want to know which one is power consumption?  P in  or P out or...  ????? 😳

Have you tried doing calculation as explained in next posts : 

Calculating power consumption for PLC I/O signal module

Power Consumption

calculating current and power consumption of S7-300 DI, DO

Thanks for your suggestion. 

But there is one thing :

What is power loss at datasheet?  This item should add to our load consumption or not? As a mater of fact if we use the word loss we should add it to our design? The general formula: totall power is equal delivered power + dissipated power.

Thanks in advance. 

My advice:

Install the PLC, get a power analyser a check how much energy is consumed

H2sh

Hi dear collegous 

 I hope you are doing well. As I knew the general formula for power is: P in= P out +P loss.

I have seen that the word power consumption at any datasheet of for example signal modules or...  of Siemens. 

Now I want to know which one is power consumption?  P in  or P out or...  ????? 😳

 

Hello,

Could you be more specific? Is it a DC or AC power calculation? In case of an AC calculation: how many phases?

In DC the formula will be: P=U*I

In AC 3~ it will be: P=U*I*SQRT3*CosPhi.

To do a power calculation, at least you will need a amperage measurement, because this is the only variable. The rest is static.

In case of a 3~ AC situation the real power take off - without CosPhi (P loss)- is written in KVA. So this is the power needed to e.g. drive the generator including copper, iron and mechanical losses. What comes out of the generator (Preal) is written in kW.

So to give answer to your question: the power consumption will always be Pin.

Regards,

Alex

@Alex Mol

 nice.

vkkepl

@Alex Mol

 nice.

 Thanks! 

Alex Mol

 

H2sh

Hi dear collegous 

 I hope you are doing well. As I knew the general formula for power is: P in= P out +P loss.

I have seen that the word power consumption at any datasheet of for example signal modules or...  of Siemens. 

Now I want to know which one is power consumption?  P in  or P out or...  ????? 😳

 

Hello,

Could you be more specific? Is it a DC or AC power calculation? In case of an AC calculation: how many phases?

In DC the formula will be: P=U*I

In AC 3~ it will be: P=U*I*SQRT3*CosPhi.

To do a power calculation, at least you will need a amperage measurement, because this is the only variable. The rest is static.

In case of a 3~ AC situation the real power take off - without CosPhi (P loss)- is written in KVA. So this is the power needed to e.g. drive the generator including copper, iron and mechanical losses. What comes out of the generator (Preal) is written in kW.

So to give answer to your question: the power consumption will always be Pin.

Regards,

Alex

 @Alex Mol

TNX for yor reply.

My question was about signal module (DC mode) an I found that by your replies .