Honeywell UDC3500 Product Manual page 127

Function Prompt
Lower Display
C3 RANGE
This prompt will appear
only when the
OUT2 ALG Parameter
is configured for
CURRENT, CUR D,
CUR TI, or TI CUR.
3/07
Selections or
Range of Setting
Upper Display
50 PCT
100PCT
4-20mA
0-20mA
UDC3500 Universal Digital Controller Product Manual
Parameter
Definition
CURRENT DUPLEX RANGE (SPLIT) FOR LOOP 2
—Splits the Control Output across two physical
outputs. This setting should be used for
Relay/Current and Current/Relay Duplex Outputs.
This setting should also be used when
Current/Current Duplex operation is desired. This
enables one current output to provide heat control
and another current output to provide cool control.
To enable Current/Current Duplex (split) for Loop 2:
• Second Current Output and Third Current Output
in the Options Set Up group must both be
configured for Output 2 (See Section 3.22).
• Scale Second Current Output for 50-100 %
controller output (HEAT).
• Scale Third Current Output for 0-50 % controller
output (COOL).
• Deadband for both outputs for this configuration
must be scaled in.
FOR EXAMPLE:
If a 2 % Deadband is desired, then:
In the Options group, set the Current #2 LOW VAL
selection to 51.0 and the HIGH VAL selection to
100.0.
In the Options group, set the Current #3 LOW VAL
selection to 49.0 and the HIGH VAL selection to 0.0.
CURRENT DUPLEX RANGE (FULL)—Enables one
of the Current Outputs 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 %.
A second current output is not required for this type
of duplex operation.
THIRD CURRENT OUTPUT RANGE—Allows the
user to easily select 4-20 mA output or 0-20 mA
output operation without the need for recalibration of
the controller.
ATTENTION Changing the Current Output Range
will result in the loss of Field Calibration values and
will restore Factory Calibration values.
Configuration
111