West Control Solutions N8080 (for 1xxx) - Manual (Page 20)

1.3.1 Mains (Line) Supply
The Indicator will operate on 90 - 264V AC 50/60Hz mains (line) supply. The power
consumption is approximately 4 watts.
CAUTION: This equipment is designed for installation in an enclosure
which provides adequate protection against electric shock. Local
regulations regarding electrical installation should be rigidly
observed. Consideration should be given to prevention of access to
the power terminations by unauthorised personnel. Power should be
connected via a two-pole isolating switch (preferably situated near
to the equipment) and a 1A fuse, as shown in Figure 1-4.
If the Indicator has relay outputs in which the contacts are to carry mains (line)
voltage, it is recommended that the relay contact mains (line) supply should be
switched and fused in a similar manner but should be separate from the Indicator
mains (line) supply.
1.3.2 20 - 50V AC/DC Supply
Power should be connected via a two-pole isolating switch and a315mA
slow-blow (anti-surge Type T) fuse. With this option fitted, the Indicator will accept
20 - 50V AC @ 50/60Hz or 20 -50V DC in the polarity shown in Figure 1-4.
1.3.3 Thermocouple Input
The correct type of thermocouple extension leadwire or compensating cable
should be used for the entire distance between the Indicator and the
thermocouple, ensuring that the correct polarity is observed throughout. The
positive leg should be connected to Terminal 3 and the negative leg to Terminal
4. Joints in the cable should be avoided, if possible.
NOTE: Do not run thermocouple cables adjacent to power-carrying
conductors. If the wiring is run in a conduit, use a separate conduit
for the thermocouple wiring. If the thermocouple is grounded, this
must be done at one point only. If the thermocouple extension lead
is shielded, the shield must be grounded at one point only.
1.3.4 RTD Inputs
Three-wire or four-wire RTDs may be used. For three-wire RTDs, connect the resistive
leg of the RTD to Terminal 2, the common legs to Terminals 3 and 4 and a link
between Terminals 1 and 2. For four-wire RTDs, connect the resistive legs to
Terminals 1 and 2 and the common legs to terminals 3 and 4.
1-4 Volume II PM090-1
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