Wiring - Deckma Hamburg OMD-2008 Instruction Manual

DECKMA HAMBURG GmbH

8 Wiring

See Section 2 for important notes concerning wiring.
This unit must be connected to the mains supply via a suitable rated and
approved fused isolator unless such fusing / isolation is provided by associated
equipment. When fitted, the isolator should be close, readily accessible and
marked as to function.
Electrical connections are made through the metric cable gland openings
prepared underneath the instrument. Not all openings may be free.
Fig. 4
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 control 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.
If the instrument is operated at high voltages, additional care has to be taken to
provide reliable ground connections. Ground (PE) can be connected direct to the
terminal or, if this is not sufficient according local rules, to the computer housing
(PE bolt inside, right side).
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
Issue: 25.09.2015 preliminaryInstruction Manual OMD-2008 (All Versions) Page 18 of 28