Honeywell T775R 2000 Series - Derivative; Schedule

T775R SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER
62-0249—13 24
NOTES:
a. The Integral time is factory set for 400 seconds and is
similar to the response time to the T775J Series 1000
models. 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).
b. 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.
c. 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. 59. Setup - Outputs - Mod Out - Derivative.
3.3.3.1.4. 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 Mod menu, use the  and  buttons to
highlight DERIVATIV.
2. Press the  button to display the Derivative sec-
onds.
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 seconds and
return to the Mod menu.
Fig. 60. Setup - Outputs - Mod Out - Schedule.
3.3.3.1.5. SCHEDULE
The Schedule option displays only if the USE SCHED
parameter is set to Yes (Refer to Fig. 65 on page 26).
1. From the Mod menu, use the  and  buttons to
highlight SCHEDULE.
2. Use the  and  buttons to highlight YES or NO.
Default: YES
3. Press the  button to accept the selection and
return to the Mod menu.
Each output can be set up to follow or ignore the built in
scheduler. To disable the scheduler for all outputs, Refer
to “3.3.5.1. USE SCHED” on page 26.
SETUP
OUTPUTS
MOD 1
DERIVATIV
ENTER
DERIVATIVE
TIME FOR
MOD 1
SETUP
OUTPUTS
MOD 1
DERIVATIV
0
SEC
M24338
SETUP
OUTPUTS
MOD 1
SCHEDULE
SETUP
OUTPUTS
MOD 1
SCHEDULE
USE
SCHEDULE
FOR
OUTPUTS
YES
NO
M24339