Emerson Damcos, Service Manual

Page: 124 / 144

Service Manual Damcos LPU: LPU Power Control System
SM 8000-100-01 Ed 04 February 2017
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Operating LPU-D
Opening / Closing
LPU-D requires only 3 wires to operate the valve. When the motor is energized, it opens or closes the
valve, dependent on the activation of the solenoid valve, runs for a further 7 sec., and then stops. The
valve is locked in position by a double pilot operated check valve, preventing the oil from flowing
back into the tank.
If you wish to obtain intermediate positions, the motor and the solenoid valve are simply de-ener-
gized when the required position has been reached.
Note! To prevent automatic restart after blackout, it is recommended to take away the power
for 30 seconds after the valve has reached end position.
Electrical LPU-D
The motor/pump starts directly by means of power on - open or close. If the pressure exceeds 70 bar
for 7 sec. the timer stops the motor/pump.
This circuit ensures a high safety on the LPU.