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4
Figure 5 . 1 : Screw Terminal
When wiring to spring-clamp terminals, use a screwdriver with a 3-4 mm blade to
depress the spring-clamp button before inserting the termination cable. See Figure 5.2.
5 .1
DC Power Requirements
Megablocks draw DC power from the fieldbus trunk segment they are connected
to. The minimum DC input voltage, and current required, vary with the Megablock
type. Refer to the F300 datasheet for exact current requirements. The maximum
input voltage is 32V DC, but a lower voltage may be required in order to achieve safety
in some hazardous area applications - refer to the Control Drawings in Sections 9 & 10
of this manual.
5 .2
Terminator
A terminator (Model No. F97) is provided with each
F300 Megablock. The terminator should be installed on
the trunk of the last Megablock in order to correctly
terminate the bus. The terminator is placed in the
second set of terminals on the trunk connector.
For spring clamp terminals, push the terminator firmly into
place. Take care to orientate the terminator so that the "T–F97" molded logo is facing
inwards towards the body of the Megablock, otherwise difficulty will be experienced
in accessing the spring-clamp buttons to remove it. For screw terminals, loosen the
screws, insert the terminator so that the molded logo is visible and then tighten the
screws. The F97 terminator has no specific polarity but inserting it with the 'T' visible
clearly identifies the component, and its purpose.
When not in use, the F97 should be stored in the convenient storage slot provided in
the F300 body close to the trunk connection (Figure 1.1 shows it mounted this way on
the F304 model).
5 .3
Trunk connections
Each trunk connector provides two sets of interlinked (+), (–) and cable screen (S)
connections.
The second connection enables the user to onward connect the trunk to a further
Megablock and avoids breaking the connection if an "upstream" Megablock needs to
be removed.
The second connection can also be used, as mentioned above, to install the F97
terminator if it is the last Megablock on the segment. See Section 5.5 for information
on cable screen grounding.
It is not permitted to connect or disconnect the trunk wiring in a hazardous
area without a gas clearance certificate or unless the circuit to which it is
Figure 5 .2: Spring Clamp
NOTE
WARNING !
connected has been de-energised.
INM F300 Rev 9
Figure 5 .3
F97 terminator
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