Eurotherm 7000 Series, Руководство пользователя

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Installation
7300A user Manual
2-10
Figure 2-11 Control signal connection (self-powered unit, base version)
a) external signal, e.g. from Eurotherm series 2000 controller
b) manual command from external potentiometer .
ANA
31 0V
A
32 RI 33 5V
A
Analogue
conector
signal
connector
0 V
+ Control
Signal
a)
b)
+5 V internal
ANA
31 0V
A
32 RI 33 5V
A
10 kΩ
Potentiometer
0 V
0%
100%
2.5.2. Control signal
The analogue control signal terminal block is labelled ANA.
Input Signal :
The input available corresponds to the input type selected in the product code (specified
range of voltage or current). The signal must be connected between terminals 32 and 31.
The ‘+’ of the control signal must be connected to terminal 32 (labelled RI).
A typical external signal connection is shown on figure 2-11a.
Manual Control :
Figure 2-11b shows how to use the internal 5 V voltage (terminal 33 labelled 5VA) for
manual control with an external 10 k
Ω
potentiometer (input code 0V5 only).
2.5.3. Connecting the reference neutral voltage
In 4S load configuration, to enable the Diagnostic DLF and the power control VICL the
neutral voltage of the three-phase supply (reference neutral) must be applied to terminal
21, marked N (EXT connector).
This connection of reference neutral voltag, enables to measure the real load potential.
This connection must be protected by a 1 A fuse (see figure 2-12).
Loss of the reference neutral connection causes an alarm (see Alarms section)
Figure 2-12 Connecting the supply neutral voltage (code 4S and DLF, VICL)
EXT
21
N
22
Coupling neutral connexion for 4 wire option:
DLF , VICL
ANA 31 0V
A
32 RI 33 5V
A
To the network Neutal
Fuse 1 A