Eurotherm Chessell 4102C, Руководство пользователя

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HA249928
Issue 15 Jly 06 Page 24
100 MM RECORDER USER GUIDE
4.2 TRANSMITTER POWER SUPPLY OPTION
4.2.1 Introduction
This option supplies one or two sets of three iso-
lated 25 Volt outputs wired to terminal blocks for
user connection. Each output is intended to sup-
ply power to a remote transmitter in order to run a
0 to 20 mA or a 4 to 20 mA current loop.
Figure 4.2.1 shows an overall view of a transmitter
power supply option fitted in the rear terminal
cover.
FUSES
The fuse is a 63mA (220/240V) or 100mA (110/
120V), 20mm anti-surge type T located on the
circuit board as shown in figure 4.2.1 above.
Spare fuses are available from the manufacturer.
SAFETY ISOLATION
Isolation (dc to 65Hz; BS EN61010) InstaIlation category II; Pollution degree 2 (see section 6 for definitions)
Channel to channel = 100V RMS or dc (double insulation); Channel to ground = 300V RMS or dc (basic insulation)
4.2.2 Signal wiring
Each set of outputs is terminated at a terminal block
as shown in figure 4.2.2
In order to read input values successfully a resistor
must be connected across V+ and V- of the input
channel. This resistor should have a minimum
specification of 1.4 Watt,
±
1% and should be either
100
Ω
or 250
Ω
in value as required. Resistors of this
kind are available from the manufacturer.
User outputs
`
Transmitter power
supply fuse
Transmitter power
supply fuse
Plastic cover
retaining screw
+ + + - - - + + + - - -
Output 1 Output 2 Output 3 Output 1 Output 2 Output 3
User outputs
Black Black
Black
Red Red Red
– +
Transmitter
+
-
Other transmitters
V+ V-
Channel input
– + – +
Only one channel
shown, for clarity.
Long terminal cover
Recorder rear
terminal panel
User terminal block
I
R
Transmitter Power Supply
PCB
Figure 4.2.1 Transmitter power supply
Figure 4.2.2 Transmitter power supply signal wiring