Specifications

222 PRT-CTRL-SE Protege System Controller Reference Manual | PRT-CTRL-SE
Register Offset Register Function
15 Integral Term
The integral term is the result of a calculation using the integral gain and the integral error
to obtain a value that can be used to add with the Plant Error to ensure that the heating
and cooling set points are meet with the maximum amount of efficiency.
16 Output Error
The output error is the absolute output error at the current point and can be used as a
guide when tuning the RTHP. The output error represents the Integral Term added with
the raw Plant Error values. The output error is used to calculate the staging of the heating
and cooling within the RTHP unit.
17 Integral Gain
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 economies
analog 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.