Deckma Hamburg OMD-2008 Series Instruction Manual page 43

Precise wiring details will vary dependent upon the control system to be employed but
the most frequently used systems employ alarm relay 1 for alarm only and alarm relay 2
for overboard valve purposes.
Electrical connections are made to the terminal blocks inside the computer housing.
Wires are connected to the terminals by pushing a suitable screwdriver into the clamp
holes to release the internal spring-loaded clamps. After the wire is inserted to the
terminal and the screwdriver is removed, the wire is fixed.
Terminals 1&2 are reserved for power supply input. Up next is the first ground connection
PE.
The instrument provides a pilot voltage output at Terminals 3&4. This is internally
connected to the power supply input (Terminals 1&2 via Fuse T2A). The pilot voltage can
be used to supply additional external circuitry, e.g. alarm lamps or electrical valves. Up
next is the second Ground (PE), which is connected to the Ground (PE).
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Please note: any device connected to the pilot voltage output must be rated for the
voltage the instrument is supplied with. Do not use the pilot voltage for driving motors,
heaters or other high load devices. The pilot voltage is intended for alarm purposes only.
The Terminals 5 – 10 are for alarm 1&2. The switch over contact relays are reserved for
alarm 1 and alarm 2, respectively. These are free switch over contacts. NO means
"Normally Open", COM means "Common", and NC is "Normally Close". The Terminals
5 – 7 are changeover contacts for the potential free output alarm 1. Terminal 5 is NO,
Terminal 6 is COM, and Terminal 7 is NC. The Terminals 8 – 10 are also changeover
contacts for the potential free output alarm 2. Terminal 8 is NO, Terminal 9 is COM, and
Terminal 10 is NC (see Figure 20. Connection Example).
The Terminals 11&12 are dedicated "STATUS" inputs for the STATUS SEPERATOR signal
provided by the separator.
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Note: Alternatively, a "Status Separator" signal can be generated from the Separator
control, and an auxiliary relay be operated with this signal. The Contacts of this relay then
can operate the "STATUS" input. Please refer to the Separator manual or contact the
separator maker for information regarding the separator. Additionally, the separator
status will be recorded into the data logger*.
Input "RES" is reserved for future use. The state of the "RES" input is recorded in the
electronic record.
Terminals 15&16 are input for an optional external flow switch. Use a dry contact. The
Unit is delivered with a link as standard. If the Terminals are open, the Unit will be in alarm
condition.
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