PRT CTRL Integrated Controller Reference Manual

The integral gain is the gain of the integral portion of the PI loop
and is a division of the actual integral error amount that is used to
form the calculation. The integral gain will divide by 1, 2, 4, 8 etc
by setting a value of 1,2,3,4 ... 15.
If a value of 0 is programmed for the integral gain
the system will not use integral within the PI loop
and it will be disabled.
18 Integral Maximum Value
As the integral value is a calculated value that is continually
updated it can easily reach a saturation point where the plant can
not meet the integral and plant error values. In this case we
program a limit that will stop the integral from increasing beyond a
recoverable point.
19 Integral Calculation Time
The integral calculation time is a time base used by the integral
portion of the PI loop to update the Integral Error. It is advised not
to set this below a value of 30 seconds.
20 Fresh Air Damper Normal Setting
The fresh air damper normal setting is the value that is output on
the fresh air economiser analogue output used to control the fresh
air damper position. This value allows the system to be tuned to
an appropriate setting to allow the require Litres Per Second of
fresh air to enter the RTHP.
Roof Top Heat Pack Mode Definition
Register Offset Register Function
0 RTHP Idle Condition
The programmable function is idle and no processing is taking
place.
1 RTHP Waiting For Start Signal
The programmable function is waiting for the enable PGM signal to
be controlled to an ON state to start operation. This is usually
managed by a schedule or the alarm status. When the signal is
received the Fan PGM will be activated and the programmable
function will enter a delay of 30 seconds before starting.
2 RTHP Warm Up Check
If the RTHP is programmed to enter a warm up state at the start of
operation the temperature will be checked here to verify if the
warm up temperature is above the current space temperature if it
is then the RTHP will enter the warm up mode.
3 RTHP Warm Up Space
When in warm up mode the RTHP is driven to full capacity to get
the space above the heating set point in the fastest possible time.
Once the temperature reaches this level the system will operate
normally.
4 RTHP Deadband Process
The deadband process is where the RTHP will wait for a condition
that is outside the set points for heating, cooling or
291 Protégé Integrated System Controller Reference Manual