Edwards TCU 40/80

4. Press MUTE to silence the alarm.
The TCU 40/80 is shipped without coolant. The coolant level alarm will sound and the front panel
Reservoir Coolant Low Level LED will be red indicating that the reservoir must be filled.
5. Fill the coolant reservoir using the procedure Filling the Reservoir on page 26.
6. Press the START button and verify the front panel indicators are as in the Start Condition column of
Table 8.
7. Use a halogen leak detector to check all supply and return line connections at both the TCU and
process equipment, around the pump head assembly, drain valve, heater, flow switch, vent line, fill
line, and reservoir pressure relief valve.
6.3 Changing the setpoint value (SV1)
The following instructions are for local temperature control only.
Do not exceed the temperature range of-40 °C to +80
This is the normal operating range of the TCU 40/80.
To change the temperature settings press page up or page down to cither increase or decrease the
temperature. The red display "PV" indicates the process value. The green display "SP" indicates the
current setpoint.
Note: The temperature controller has been programmed to prevent the setpoint from exceeding the
normal operating range of the TCU 40/80. The controller is also protected from unauthorized changes to
the Pid and other settings, Contact the process equipment supplier for access to these settings and other
information.
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Figure 10 - Temperature controller
6.4 Temperature controller Pid settings
Edwards default settings are:
PID1 - heating
Pbl
Arl
rAtl
dbl
value
8.0
0.43
7.0
1.0
PID2 - cooling
Pb2
Ar2
rAt2
db2
value
12.5
0.7
9.0
1.0
parameter
proportional band
automatic reset
rate
deadband
TCU 40/80 Temperature Control Unit 21