Parameter Generation and Control 9354-4250 - Output Screen (Steady State and Programmable Modes

PGC, Inc. Appendix B; SmartPad version 0.503 Steady State & Programmable
November 2005 B-6
Output Screen (Steady State and Programmable Modes)
The output screen indicates the position of the air bypass damper, dryer bypass damper and the
power applied to the air and water heaters. These outputs can be in the range of 0.00% (full
cooling) to 100.0% (full heating). This screen is view only.
AIR DAMP OUT indicates the position of the bypass damper. This output is present only in slow damper cascade
mode.
AIR HEAT OUT
indicates the duty cycle of the resistance heaters in the air stream. This will also relate to the
position of the air bypass damper actuator in the two temperature and cascade control modes. This output is
presenting all modes.
* When the system operates in low temperature mode the output percentage of the air heaters is limited in
firmware. A typical firmware limit would be 10%. This means that if the air heat control is calling for output in
low temperature mode, the actual heater will only be energized 10% of the time. If the air heat control is calling for
1/2 output in low temperature mode, the actual heater will only be energized 5% of the time.
* When the system is operating in normal (not low temperature mode) the air heat out will reflect the actual heater
duty cycle.
H2O HEAT OUT
indicates the duty cycle of the resistance heaters in the water control system. This will also relate
to the position of the hot gas bypass control actuator in the refrigeration system. This output is present in all modes
except for dryer mode and low temperature mode.
REFRIG. OUTPUT
indicates the position of the hot gas bypass control actuator in the refrigeration system. This
output is present only in low temperature mode. When the system is operating in low temperature mode, the
refrigeration capacity is a function of the air temperature control loop, rather than the water temperature control
loop.
DRYER OUTPUT
indicates the position of the desiccant dryer control dampers. This output is present only in
dryer mode.
AIR DAMP OUT 50.0%
AIR HEAT OUT 35.0%
H2O HEAT OUT 50.0%
ESC
Key for function keys action
F1 = no function
F2 = no function
F3 = no function
F4 = ESC: return to process
variable screen