2.8
2.6 Signal connections
It is recommended that the analyser is switched off while signals are being connected
or disconnected. Signal terminals are located on the rear of the analyser and are
identified as plugs PL1 to PL5. Two plugs PL1 and PL5 are always fitted, PL2, PL3 and
PL4 are present only when the corresponding option cards are fitted.
A loose 14-way socket connector with accessories is provided to make connections to
each plug. The plugs and sockets are keyed so that the sockets may only be located
in the correct plug position. The loose socket covers have an identification number
which corresponds to the mating plug. Ensure that each socket is always fitted with the
correct covers. The separate covers on PL1 to PL4 provide segregation between
current output and relay wiring. The sockets and cover must always be fitted and
secured, even when signals are not required. Figure 2.7 shows the assembly of plugs
PL1 to PL4 with segregated covers. The assembly for plug PL5 is similar but with a
single 14-way cover provided.
The loose sockets have screw terminal connections. These will accept a flexible
conductor which has a cross sectional area in the range 20 AWG to 16 AWG, 0.5 to 1.5
mm
2
or a solid conductor which has a cross sectional area in the range 20 AWG to 14
AWG, 0.5 to 2.5 mm
2
. Solid conductors larger than 18 AWG, 1 mm
2
are difficult to dress
inside socket covers and are therefore not recommended.
For compliance with EMC standards connections to current outputs must use screened
or shielded cable, with either separate screened pairs or two pairs with an overall
screen. The screens ( or drain wire for foil screens ) must be terminated at pin 1 or pin
6 (both if separate screened pairs are used). All signal inputs (plug PL5) must use
screened or shielded cables with the screen or drain wire terminated at the functional
earth stud (M4) adjacent to PL5.
After wiring the loose sockets, the covers must be re-fitted for safe operation. To avoid
straining the screw terminal connections attach the cable sheath to the cover by
trimming and folding out the appropriate section of the cover and securing the cable to
it using the cable tie provided. Clip the remaining cover sections into place around the
cable.
The loose sockets are provided with end blocks and jack screws which must be fitted
and used to secure them to the corresponding plug. Do not over tighten screws.
The signal terminals each have a legend indicating their function.
Plugs PL1 to PL4 provide the analogue output and relay output electrical connections.
PL1 is provided as standard and contains 3 relay outputs and two analogue outputs.
PL2 to PL4 are optional and provide two relay outputs and two analogue outputs each.
The connection details for PL1 to PL4 are summarised in Table 2.3.
The option card population may be determined by reading the code number from the
label on the under side of the chassis and referring to the technical data sheet included
in this manual.
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