Power Supply
Insert the power supply cable 90-260 VAC into the TCU
connector casing through the inlet on the left edge and
connect it to the terminal block as shown in Figure 17.
Current Signal Cables
Another current output has been added to TCU Rev B.
VConsistency is hardwired in the current output 1 (CS+,
CSIN). Process temperature (°C/°F) or process con-
ductivity (mS/cm) can be chosen to the current output
2 (CS2+, CSIN2).
Insert the current signal cable into the TCU connect-
orcasing through the inlet and connect to the terminal
block as shown in Figure 17:
– Connect the voltage supply line to connector CS+
or CS2+.
– Connect the current output line to connector CSIN
or CSIN2.
NOTE: Valmet MCA's current supply is passive and needs
an external source of current. The minimum supply
voltage is dependent on resistance.
NOTE: The current signal cable's protective shield must
not be connected from TCU to the device in TCU Rev B.
The connection is made only from the system! The
cable's protective shield has been guided to be connec-
ted also to the connector 'SHIELD' in TCU Rev 0 and TCU
Rev A.
Figure 16 shows resistance as a function of supply
voltage. Resistance here means the sum of measure-
ment resistance, cable resistance and power source
resistance in the current loop.
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