Zapi COMBI AC1 Instrukcja Użytkownika Pobierz pdf (Strona 39)

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The CNA#18 potentiometer modulates the current in the

proportional valve connected to the pin#8 of the MDI-

PRC. This proportional valve is normally closed (oil does

not pass-through when de-energized) and directly

connected between the pump and the tank: to do a Lifting

function the voltage into the Proportional Valve is turned

fully On, to direct the oil into the tank before the pump

contactor closes. Then the current in the Proportional

Valve reduces (meanwhile the CNA#18 potentiometer

increases) to accelerate the Lifting.To do a Lowering

function, the current in the proportional valve

progressively increases (meanwhile the CNA#18

potentiometer increases) to accelerate the Lowering.

- 3: Only the Main Lifting/Lowering pair (CNB#9 and CNB#8)

is used to handle an On/Off Lifting and a proportional

Lowering. (There is only one proportional valve connected

to the pin#8 of the MDI-PRC to modulate the Lowering).

The CNB#9 input is the Lifting request enabling the pump

contactor on CNA#4.

The CNB#8 input is the Lowering request to enable the

On/Off descent valve connected on CNA#6.

The CNA#18 potentiometer modulates the current in the

lowering proportional valve (pin#8 MDI-PRC) when the

Lowering request is active. To do a Lowering function, the

current in the proportional valve progressively increases

(meanwhile the CNA#18 potentiometer increases) to

accelerate the Lowering.

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Zapi COMBI AC1 Instrukcja Użytkownika Strona 39