T775A/B/M SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS
62-0254—13 22
Fig. 49. Setup - Outputs - Mod Out - Type.
2.3.1.1. TYPE (of output signal)
1. From the Mod menu, use the and buttons
to highlight TYPE.
2. Press the
button to display the Type selections.
3. Use the
and buttons to highlight the desired
output type.
Default: 4-20 mA
4. Press the
button to accept the selected type and
return to the Mod menu.
Fig. 50. Setup - Outputs - Mod Out - Minimum Output
Percentage.
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
and buttons
to highlight MIN OUT %.
2. Press the
button to display the Min Out %.
3. Use the
and buttons to increase/decrease
the desired value from 0% to 100% in 1% incre-
ments.
Default: 0%
Range: 0 to 100%
4. Press the
button to accept the percentage and
return to the Mod menu.
Fig. 51. Setup - Outputs - Mod Out - Integral.
2.3.1.3. INTEGRAL
1. From the Mod menu, use the and buttons
to highlight INTEGRAL.
2. Press the
button to display the Integral seconds.
3. Use the
and 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
button to accept the seconds and
return to the Mod menu.
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).
SETUP
OUTPUTS
MOD 1
TYPE
SETUP
OUTPUTS
MOD 1
TYPE
SELECT
TYPE FOR
MOD 1
4 - 20 mA
0-10 V
2-10 V
SERIES 90
M24513
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