UGH025-0504 Thermolator TW Series
INSTALLATION 3-13
TW-1, TW-2
C
ONTROL
ENABLING AND
DISABLING
PASSCODE
PROTECTION
NOTE: All dip switch illustra-
tions in this manual show
switches 7 and 8 set to ON.
If you have an Isolated
Circuit model, these switch-
es should be set to OFF.
The TW-1 and TW-2 controls provide the ability to protect
system parameters from unauthorized changes during normal
operating mode. When system passcode protection is enabled,
the following parameters cannot be changed unless you enter
the correct passcode:
l The Process Setpoint
l High Deviation Alarm Setpoint
l Low Deviation Alarm Setpoint
l Baud Rate selection for serial communications
l Address selection for serial communications
When the unit is turned on for the first time, passcode protec-
tion is disabled. To enable passcode protection:
Disconnect and lock out main power to
the unit.
Open the electrical enclosure.
Set dip switch 3 to ON
and switches 5 and 6 to
OFF.
Close the electrical enclosure and restore
power to the unit.
Press any
button when the
control displays
“Pas rSt”
(Passcode Reset).
The control will
display the last
passcode used.
Select a new passcode using the s and t
setpoint adjustment buttons. Stop pressing the setpoint
buttons when the passcode you want appears in the set-
point display window. Selecting “OFF” as the passcode
will disable the passcode feature.
WARNING: Electric shock hazard
This equipment is powered by high voltage. Always
disconnect and lock out the main power source
before opening the unit or the electrical enclosure to
modify factory settings. Failure to disconnect and
lock out the main power source can result in severe
personal injury.
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