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IM 12J6B3-E-H
3-6 Installation and wiring
3-3-7. Changing the supply voltage
To change between the nominal supply voltages 230 and 115 Volts AC it is necessary to solder the
appropriate jumpers on the transformer connections. These are located close to the fuse and the power
terminals on the power and input board. (It is necessary to remove the safety covers to obtain access).
In addition to this, the fuse must be changed. 115 VAC uses 100mA; 230 VAC uses 50 mA.
“Time log” IEC127. Finally change the text plates with indelible pen, or secondary stickers to record the new
fuse value, and power supply voltage.
always ensure that the safety covers are properly refilled for safety reasons.
3-4. Wiring the contact signals
3-4-1. General precautions
The contact output signals consist of voltage-free relay contacts for switching electrical appliances (SPDT).
They can also be used as digital outputs to signal processing equipment (such as a controller or PLC). It is
possible to use multi-core cables for the contact in and output signals and shielded multi-core cable for the
analog signals.
3-4-2. Contact outputs
The EXA unit’s four contact outputs can be wired to suit your own custom requirements (Figure 3-6).
In the Non-Alarm or Power Off states, contacts S1, S2 and S3 are OFF, Common (C) and Normally Closed
(NC) are in contact.
In the “Fail” or Power Off states, contact S4 is ON, Common (C) and Normally Closed (NC) are in contact.
You can either use them to switch AC power, or switch a DC Voltage for digital interfacing.
Default settings
●
The contact S1 is pre-programmed for high alarm function.
●
The contact S2 is pre-programmed for a low alarm function.
●
The contact S3 is pre-programmed for wash function.
●
The contact S4 is pre-programmed for FAIL.
The three control contacts (S1 to S3) can be used for simple process control by programming their function
(Chapter 5). The FAIL contact is programmed to signal a fault in the measuring loop. Always connect the
FAIL contact to an alarm device such as a warning light, sound annunciator, or alarm panel to make full use
of the fault detection possibilities (self diagnostics) of the EXA converter.
WARNING
115 VAC
solder
links
FUSE
100mA
230 VAC
solder
link
FUSE
50mA
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