T775P SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER
17
62-0256—11
Fig. 33. Setup - Outputs - Options - Integral.
1.3.3.2. INTEGRAL
1.
From the Options menu, use the
and
buttons
to highlight INTEGRAL.
2.
Press the
button to display the integral value.
3.
Use the
and
buttons to increase/decrease the
integral time from 0 to 3,600 seconds in increments
of 10 seconds.
Default: 400 seconds
Range: 0 to 3,600 seconds
4.
Press the
button to accept the value and display
the Options 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).
Fig. 34. Setup - Outputs - Options - Derivative.
1.3.3.3. DERIVATIVE
The Derivative default value is factory set to zero (no
derivative control). It is strongly recommended that the
derivative remain at zero (0) unless you have a very good
reason to adjust it. Derivative control is not needed in the
vast majority of HVAC applications.
1.
From the Options menu, use the
and
buttons
to highlight DERIVATIVE.
2.
Press the
button to display the derivative
seconds.
3.
Use the
and
buttons to increase/decrease the
value.
Default: 0 (zero)
Range: 0 to 3,600 seconds
4.
Press the
button to accept the value and display
the Options menu.
Fig. 35. Setup - Outputs - Options - On Delay.
1.3.3.4. ON DELAY
This is the minimum time delay between consecutive ON
stages.
1.
From the Options menu, use the
and
buttons
to highlight ON DELAY, then press the
button to
display the interstage on delay.
2.
Use the
and
buttons to increase/decrease the
on delay time.
Default: 0 (zero) seconds
Range: 0 to 3,600 seconds in 10 second
increments
There is a built-in minimum delay of 1 second
between stages upon energizing.
3.
Press the
button to accept the value and display
the Options menu.
SETUP
OUTPUTS
OPTIONS
INTEGRAL
SETUP
OUTPUTS
OPTIONS
INTEGRAL
400
SEC
ENTER
INTEGRAL
TIME FOR
STAGES
M24660
SETUP
OUTPUTS
OPTIONS
DERIVATIV
SETUP
OUTPUTS
OPTIONS
DERIVATIV
0
SEC
ENTER
DERIVATIVE
TIME FOR
STAGES
M24661
SETUP
OUTPUTS
OPTIONS
ON
DELAY
SETUP
OUTPUTS
OPTIONS
ON DELAY
0
SEC
ENTER
TIME FOR
INTER-
STAGE
ON DELAY
M24662
