Volvo ECS - Page 51

51
ECS Gen. 1
ECS Gen. 1
solenoid valve
operation
A. Basic bellows air flow solenoid.
B. Control solenoid - found only in valve block for drive
axles.
DE. Solenoid ʻDe-energisedʼ. +24V supplied to both pins.
No air can pass through the valve.
E. Solenoid ʻEnergisedʼ. +24V supplied to one pin, negative
supplied to other pin. Air can pass through the valve.
DE. Control solenoid ʻDe-energisedʼ. +24V supplied to
both
pins.
Outlet (2) is connected to exhaust (3). No air can pass from
inlet (1) to outlet (2).
E. control solenoid ʻEnergisedʼ. +24V supplied to one pin,
negative supplied to other pin. Inlet (1) is connected to
outlet (2). Air can pass through the valve.
A - solenoid de-
energised
A - solenoid
energised
B - control
solenoid
de-energised
B - control
solenoid
energised