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110 UDC 3300 Process Controller Product Manual 4/00
Lower Display
Prompt
Upper Display
Range of Setting
or Selection
Parameter
Definition
OUT ALG
(continued)
CUR D CURRENT DUPLEX is similar to current simplex but uses
a second current output. The second output is usually
scaled so that zero and span correspond with 0 % and
50 % output (cool zone). When the output is 0 % to 50 %,
the controller uses tuning parameter set #2, when the
output is 50 % to 100 % it uses set #1.
Other prompts affected: 4-20 RNG
CUR TI CURRENT/TIME DUPLEX is a variation of duplex with
current active for 0 % to 50 % output (tuning set 2) and
time is active 50 % to 100 % output (tuning set 1).
Relay controls heat, current controls cool.
Other prompts affected: 4-20 RNG
TI CUR TIME CURRENT DUPLEX is similar to CUR TI except that
current is active for 50 % to 100 % and time is active for 0
% to 50 %.
Relay controls cool, current controls heat.
Other prompts affected: 4-20 RNG
4-20 RNG
CURRENT DUPLEX RANGE ALGORITHM — Used with
Output Algorithm selections CUR D, CUR TI, or TI CUR.
50 PCT CURRENT DUPLEX RANGE (SPLIT)—This setting
should be used for Relay/Current and Current/Relay
Duplex Outputs. It can also be used for Current Duplex
when an Auxiliary Output board is present. This enables
the normal control current output to provide heat control
and the auxiliary current output to provide cool control. To
enable this:
• AUX OUT in the Options Set Up group must be selected
for Output.
• The Auxiliary Current Output is scaled as desired for 0-
50 % controller output.
• Deadband for this configuration only applies to the
Current Output. The Auxiliary Output must have the
Deadband scaled in.
FOR EXAMPLE: If a 2 % Deadband is desired, then enter
2.0 for the Deadband selection in the Control Algorithm
group. This will apply Deadband to the Current Output. In
the Options group, set the Auxiliary Output 4mA VAL
selection to 49.0 and the 20mA VAL selection to 0.0.
100PCT CURRENT DUPLEX RANGE (FULL) enables the Current
Output to provide both heat and cool functions for control
over 0-100 % of the controller output. The PID heat
parameters apply when the output is greater than 50 %
and the PID cool parameters apply when the output is less
than 50 %. The second current output is not required for
this type of duplex operation.