External Control System - Deckma Hamburg OMD-2008 Series Instruction Manual

* As replacement to a MEPC.60(33) approved separator and no "Status Separator" signal is available.
Terminals 17&18 are for signal output of 0(4) to 20 mA. These are active outputs with an
open-load voltage about 5 V. And it is recommended not to exceed the 150  external
load. The signal output complies the oil content from 0 to 30 ppm. In case of malfunction
e.g. EE means 20 mA.
The Terminals 19&20 could be linked to switch the EV-Valve to clean water. The EV-Valve
allows to remotely control the valve operation. The OMD-2008 will switch as requested
within 20 seconds. The EV-Valve will stay in clean water condition, and the OMD-2008 will
remain in alarm condition, as long as the link (Terminals 19&20) is present. These are dry
contacts as well.
The Terminals 21&22 are outputs for external fresh water usage feedback. The OMD-2008
EV, EVA , EVFC will close the FW Valve Feedback contact whenever the FW Valve is set to
clean water usage.
Note: The Feedback contact is not influenced from the system fault conditions.
The Terminals 23 - 25 are changeover contacts for the potential free system fault alarm.
Terminal 23 is NO, Terminal 24 is COM, and Terminal 25 is NC.
i
Note: For any input, it has to be used a potential free relay switch for the link to electrically
insulate the OMD-2008 from any external voltages.
Generally, the inputs and the output share a common potential (Terminals: 12, 14, 16, 18,
20, 22).
9.1

External Control System

The installation on site has to make sure that in case of any loss of power supply and/or
loss of air supply for the automatic stopping device the overboard discharge valve closes
the overboard line and open the re-circulating line.
The system showed in the example see Figure 20. Connection Example, employs alarm
relay 2 to control a pneumatic solenoid valve which energizes or de-energizes a
pneumatically operated 3 - way valve.
The separation process will continue until such time as the pollution level falls below the
alarm set point at which time the discharge will be directed overboard.
A pump stop system is according MEPC.107(49) not allowed.
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