Honeywell AC-220-7, AC-140-7 manual Min Out %, Integral, Type of output signal

T775A/B/M SERIES 2000 CONTROLLER 2. SETUP (ADVANCED OPTIONS)

SETUP

OUTPUTS MOD 1

TYPE

SETUP

OUTPUTS

MOD 1

TYPE

4 - 20 mA

0-10 V

2-10 V SERIES 90

SELECT

TYPE FOR

MOD 1

2.3.1.1.TYPE (of output signal)

1.From the Mod menu, use the S and T buttons to highlight TYPE.

2.Press the X button to display the Type selections.

3.Use the Sand T buttons to highlight the desired output type.

Default: 4-20 mA

4.Press the X button to accept the selected type and return to the Mod menu.

M24513

Fig. 47. Setup - Outputs - Mod Out - Type.

SETUP

OUTPUTS

MOD 1

MIN OUT %

SETUP

OUTPUTS

MOD 1

MIN OUT %

0%

ENTER
MINIMUM
PERCENT FOR
MOD 1	M24514

2.3.1.2. MIN OUT %

The minimum output % prevents the output from dropping below the value entered. This value can be useful to maintain minimum damper position.

Using the time clock or digital input to disable the output forces the output to 0%.

1.	From the Mod menu, use the S and T buttons to
	highlight MIN OUT %.
2.	Press the X button to display the Min Out %.
3.	Use the S and T buttons to increase/decrease the
	desired value from 0% to 100% in 1% increments.

Fig. 48. Setup - Outputs - Mod Out - Minimum Output

Percentage.

Default: 0%

Range: 0 to 100%

4. Press the X button to accept the percentage and

return to the Mod menu.

SETUP

OUTPUTS

MOD 1

INTEGRAL

SETUP

OUTPUTS

MOD 1

INTEGRAL

400 SEC
ENTER
INTEGRAL
TIME FOR
MOD 1	M24515

2.3.1.3. INTEGRAL

1.From the Mod menu, use the S and T buttons to highlight INTEGRAL.

2.Press the X button to display the Integral seconds.

3.Use the S and T buttons to increase/decrease the value from 0 to 3,600 in 10 second increments.

Default: 400 seconds

Range: 0 to 3,600 seconds

4.Press the X button to accept the seconds and return to the Mod menu.

Fig. 49. Setup - Outputs - Mod Out - Integral.

NOTES:

1.The Integral time is factory set for 400 seconds. This is a good middle range and should satisfy many applications. The integral time can be increased for applications where sensed response is slow, and can be decreased for applications where sensed response is fast (e.g. discharge air control).

2.As a starting point, an optimal integral time for discharge air typically ranges from 12 to 200 seconds. An optimal integral time for room control typically ranges from 60 to 2,500 seconds. The purpose of integral action is to reduce or eliminate the offset from setpoint during steady state control that is often seen in proportional only control.

3.Keep in mind that control is most sensitive to throttling range. Adjust the throttling range first before any adjustment to integral time. Adjust throttling range to be as wide as possible to start since this will provide the most stable control. Remember that the integral will eliminate the steady state error so you do not need to have a small throttling range to have accurate control. (Integral action allows for controlling to a setpoint even with a wide throttling range).

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