Version Markings Of Sigmapower; Sigma Power 2.0 - Valtra 6000 Workshop Manual

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31. Σ---power

Version markings of SigmaPower

(see picture on page 313/2)

Sigma ---ver-

In the tractor production Sigma 2.0 is fixed on 8950Hi and on 8750 tractors.

Max. engine power output: 8950hi: 160 / 200 hp. 8750: 160 / 190 hp

Sigma engages at a torque of about 400 nm (350---450 Nm)

--- measured at pto shaft; ac display shows 35---40 %

Sigma disengaging limit is about 50 nm lower than the engaging torque limit

Engaging delay is 0.5 seconds (= over 400 nm min. 0.5 sec.)

Disengaging delay is 5 seconds (= below 350 nm min. 5 sec.)

The function of the 2.0 system is more accurate than earlier versions due to:

--- new electronics and programs in the control unit

--- zero calibration is made only with high engine speed modificated fault codes

--- easier to check which sensor (b4 or b5) is faulty or wrongly adjusted

"Zero" calibration have to be done after repairs of pto and after fixing a new control unit

--- disengage pto (lever & switch) > start the engine > keep engine speed at 1600 rpm 25...30 seconds > zero calibration

value is saved in the memory automatically > ac display shows 0 ---2 %

--- the zero calibration value is automatically determined and saved to memory every time when engine speed has been over

1500 rpm over 5 seconds (pto lever in off ---position)

--- the control unit uses always the latest zero calibration value in the memory (the value is kept in memory also when starter

switch is switched to stop position)

Used in pro-

Sigma control unit A13,

In producti-

H49112---K02

Engaging li-

flywheel hou-

ging limit 400

0,5 seconds.

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