Emerson Mobrey Hydratect 2462, Reference Manual

Page: 36 / 66

30
Reference Manual
24625020, Rev AA
Installing the Electronics Control Unit
March 2017
Installing the Electronics Control Unit
3.5.2 Preparing the fault and status relay cable
(for the Hydratect 2462A and 2462C)
The Hydratect 2462 Electronics Control Unit (“Control Unit”) uses normally-open and
normally-closed switched outputs for fault and status indication.
The outputs are available on a pair of 10-way Klippon connectors: PL204 and PL404.
Procedure for making connections to the switched outputs
1. Remove the front panel from the Control Unit case and store it in a safe place.
(This is described in detail on “Fitting cable glands” on page 22 . The panel has
mounted on it all the electronic circuitry and must be protected against adverse
conditions such as heat, dust, and static electricity).
2. Route the fault/status cable from the external equipment to the Control Unit
through suitable ducting (conduit).
3. Assemble the cable gland and fit it to the underside of the Control Unit.
Screened cables must be used. Ensure there is a good annular (ring-shaped)
contact between the cable screen and cable gland. Allow for cable conductors of
length 300 mm inside the Control Unit, and twist the power pairs together.
The fault and status cable should not be shared with electrode or power wires in
the same cable.
4. Prepare the fault/status cable for fitting to the Klippon connector, by stripping the
end of each conductor and crimping on the pins required.
(Remove only sufficient insulation to ensure good contact. The stripped-end must
be fully inserted into the pin).
5. Fit the cable to a Klippon connector by screwing in the crimped-on pins
(
Figure 3-9 on page 31 ).
(Four wiring options are shown in Figure 3-10 though Figure 3-13 ).
6. Repeat steps 2 to 4 for the second Hydratect channel.
The fault and status cables are now ready for connection to the front panel of the Control
Unit. Remember, however, that it is easier to prepare all the cables before connecting them
to the front panel.
Note
In a Hydratect 2462 system, the normal state of a status or fault relay is energized and a
not-normal state is de-energized. Therefore, in
Figure 3-9 though Figure 3-13 , the terms
N.O. and N.C. refer to the relay’s state when energized. See Table 1-2 and Table 1-3 on
page 9 for further information about fault and status relay states.