Assigning Liquid Temperature Set Points - Advanced Power technologies TTC-1000 Instruction & Operation Manual

Assigning SP11  to OUT3 and SP21  and SP12 + to OUT3 will result in the
following Boolean expression:
OUT3 = SP12  SP11SP21
Note, the OR operator plays no roll in the evaluation of the above expression.
The TIME operands cannot be inverted and can only be OR'ed to the other terms
assigned to the same output. As an example, if TIME2 is assigned to OUT3 in
addition to the operands SP1, SP2 and OUT1 as shown above, the Boolean
expression will be evaluated as:
OUT3 = TIME2 + (SP12  SP11SP21)
TIME set points are evaluated as true at any time the real time clock date is
within the specified pickup or drop out range of these set points.
NOTE: Do not use the inversion operator on individual set points when
remote control through DNP3.0 or MODBUS and fail-safe cooling control is
desired. The INVERT setting must be used on each output requiring fail-
safe cooling control when remote cooling control through DNP3.0 or
MODBUS is required. The use of the inversion operator on a set point will
not be recognized by the remote control functions resulting in the cooling
to be de-energized.
There are additional settings available that enhance the flexibility of the
programmable logic. These functions include:
 Output Timers for delaying pickup of the output relays.
 Output Inversion that permits overall inversion of logic equations controlling
outputs. This is particularly useful for fail safe operation.
NOTE: Fail safe operation is strongly recommended. Fail safe operation
ensures that the cooling system picks up whenever the TTC-1000 becomes
de-energized or encounters a failure.
Fail safe requires the output relay controlling the cooling stage to drop out
instead of picking up. This requires that each of the individual terms
operating an output to drop out and be AND'ed to every term or each term
is OR'ed and the overall output invert used to drop out the relay. Please
remember to connect the contactor coil to the normally closed contact of
the TTC-1000's output relay.

4.9.1 Assigning Liquid Temperature Set Points

Liquid temperature set points must be assigned to a specific output to start a
stage of cooling, generate high temperature alarms, and generate high
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