Honeywell UDC 3300 manual Cur D Cur Ti Ti Cur, Other prompts affected 4-20 RNG

Lower Display

Prompt

OUT ALG

(continued)

4-20 RNG

Upper Display

Range of Setting

or Selection

CUR D

CUR TI

TI CUR

50 PCT

100PCT

Parameter

Definition

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

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

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

CURRENT DUPLEX RANGE ALGORITHM — Used with Output Algorithm selections CUR D, CUR TI, or TI CUR.

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

2.0for 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.

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.

110 UDC 3300 Process Controller Product Manual 4/00