Emerson Damcos, Service Manual

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Damcos LPU: LPU P-NET System Service Manual
February 2017 SM 8000-100-01 Ed 04
131
LPU P-Net Description
The P-NET controlled LPU can be used as a stand-alone unit without being connected to P-NET. In
this case it is controlled from external inputs/outputs connected to simple push buttons, lamps or
e.g. a PLC (Programmable Logistic Controller).
The LPU has built-in internal push-buttons and LEDs to be used for commissioning/test of the unit.
Whether the LPU is controlled by the P-NET or by external inputs/outputs, the built-in microproces-
sor controls and manages the actual control. This ensures an optimal control of the LPU, which is
never overloaded.
Position Indication Input Signals
The position indicator is built into the pump block with internal wiring from position indicator to the
circuit board mounted in the LPU electrical encapsulation (except for KFR). Potentiometer for ana-
logue position indication or 2 micro-switches for end-position indication are available.
The P-NET LPU is to be configured either to position indicator type ON/OFF or analogue.
LPU with LED Position Indicator
The LED indicator is powered from the 24VDC supply for the LPU electronics, via the internal position
indicator output relays in LPU circuit board. LED indicator can be used with either ON/OFF or ANALOG
position indicator as desired.
With analog position indicator, the LED will change status over at 3% open valve and 97% open valve.