P.T.O. generators

They are electric energy generators able to take place of the fixed ones when latter are out of order. 

They can be with gasoline or diesel engine, or driven by the tractor P.T.O. through a cardan shaft. In the last case it is necessary to fit a multiplier unit between the tractor and the generator in order to have the synchronous number of revolutions. 

As there are 50 Hz of frequency, the synchronous revolutions are:

 

120 x f 6000

N = ----------------     =   --------------- 

N poli N poli

If the generator has two poles you will have n=3000 rev./min.; if it has four poles you will have n=1500 rev./min.

 

Depending on supplied voltage and current, the generator power is worth:

 

P = V.I: cos ? con cos ? mediamente 0,8 and it is expressed in kw

 

The V.I. product has a practical value and is expressed in KVA (Kilovoltampere). 

 

As the gearbox has a fixed ratio and when a definite number of revolution is required at the output, it is necessary to adjust the tractor so to assign an established rate to the P.T.O.

 

Gearboxes for this kind of machine

• A.1 B (9.600.302.30)
• A.624 B,C,E,F (9.624.322.20)
• A.4 A.F (9.603.216)
• A.629 A

 

Herewith below is a table with the most significant rates to select your own multiplier unit.

 

Gearbox	Ratio	N° Poles	RPM		Power		KVA
			Input	Output	CV	KV
A.1 B	1 : 7	2	3000	429	13	10	10
A.624	1 :6,9	2	3000	435	30	22	22
A.624	1 :3,5	4	1500	429	41	30	30
A.4 A	1 :3,8	4	1500	395	75	55	55
A.629 A	1 :1,77	4	1500	874	177	130	130

 

The range of P.T.O. drive shaft normally used on this type of machine is: 

Series: T  Type:  20 / 40 / 60 / 80 

Ex.: 07.225.015.10 / 07.425.023.10 / 07.825.013.10

 

 

- Recommended code list

9.600.302.30

9.624.322.20

9.603.216