INSTALLATION GUIDE
MODULAR SUNWAY TG
TE OD
Rev. 03
– 01/06/2018
67/
139
0-10 V f.s. mode
0-100 mV f.s. mode
0-20 mA f.s. mode
PT100
(1)
Internal use only
Table 18: Environmental analogue channel 4 DIP-switch configuration
WARNING
The inputs configured for voltage have high input impedance and must never be left open
if active. Isolating a conductor relative to an analogue input configured as a voltage input
does not guarantee that the channel reading will be zero. Zero is only correctly detected
if the input is wired to a low-impedance or short-circuited signal source. Therefore, do not
put relay contacts in series on the inputs to reset the reading.
NOTE
It is necessary to set the software parameters to match the DIP-switch settings. Hardware
configuration settings which do not correspond with the type of acquisition set in the parameters
produce results which do not reflect the values actually acquired (Please refer to the
Programming Guide)
A voltage or current value which exceeds the upper full scale value or is less than the lower full
scale value produces a saturated acquired value of the maximum and minimum measures
respectively.
6.6.3.2. Analogue Inputs to Sensors with Voltage Output
It is advisable to carry out connection of the voltage source using a shielded twisted pair by connecting the
braid onto the side of the environmental sensors and field I/O expansion board.
Although the “slow” acquisition analogue channels have a cut-off frequency just above 10 Hz, and hence
the main source of disturbance, i.e. the grid frequency, is already reduced, it is advisable to take care over
the connections especially for configurations with a full scale of 100mV or with connections using cables
over 10 metres in length. Figure 34 and Figure 35 provide an example of the connection for voltage source
acquisition.
Appropriately set the DIP-switches for configuring the relative analogue channel used, setting the full scale
at 10 V f.s. or 100 mV f.s depending on needs and setting the relative programming parameter to be
consistent with the settings just made.
Figure 34: Connection to 0
– 10 V analogue input
