User Guide

T-5800-1/T-5800-2 Technical Bulletin 7
integral time and gain dials as
prescribed above to obtain the
desired system response.
System Startup Response
The following procedure is for
determining whether an
additional time delay is required
for proper system startup.
!
WARNING: Before
stopping a system, be sure
that a change in output
pressure will not upset the
system and cause
damage
.
A. Receiver-Controllers
Using Fan “F” Connection
When the system becomes
stable, stop the system and
allow enough time to pass
until the controlled variable
deviates from the set point.
(Remember when the system
is off, the receiver-controller
returns to proportional-only
control. This feature
eliminates integral windup
during off periods.) Restart
the system and observe to
see how well it comes into
control. When the system is
started and the fan signal is
increased to maximum
(20 PSIG), the proportional-
only controller returns to
proportional plus integral
control to cause the control
point to equal the set point. If
the system response is not as
desired, determine whether
the cause is an incorrect time
delay setting (see T-5800-100
Time Delay section) or an
incorrect integral time setting
(repeat Integral Time
Adjustment procedure
above).
B. Receiver-Controllers
Having Fan “F”
Connection Capped
When the system becomes
stable, stop the system and
disconnect the P/PI jumper.
Allow enough time to pass
until the controlled variable
deviates from the set point.
Restart the system,
reconnect the P/PI jumper,
and observe to see how well
the system comes into
control. If the system
response is not as desired,
repeat the Integral Time
Adjustment procedure
above.
T-5800-100 Time Delay
After system startup, if the
system response is too slow, the
integral control function will act
on the signal before the
proportional control function
settles out. To eliminate this
problem a T-5800-100 Time
Delay (ordered separately) must
be added to the fan “F”
connection (see Fig. 16). This
device will delay the pressure
increase to the fan “F”
connection of the receiver-
controller, allowing more time for
the system to achieve
proportional control (in control)
before the integral control
function is initiated.