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3 - FEATURES
Supply air compensation
When control is being applied to the return air or room air, the supply air temperature can be compensated. This compensation is used
avoid blowing air at too cold or too high a temperature when the control is in deadband mode (no heating or cooling requirement
calculated). This compensation is activated by parameter P157.
Low
threshold
fault P240
100%
Heating compensation
0%
Proportional band P235
157
234
235
236
237
The temperature upper and lower thresholds (P240 to P245) are used to trigger a fault if the temperature is outside of these limits.
240
241
242
243
244
245
3.7 - Fan control
The controller runs the plug fans with an EC motor. The unit has one intake fan and one exhaust fan. Pressure sensors for measuring
the air flow rate are wired on the PLC.
The fans can be under constant duct flow rate control or constant duct pressure control.
Constant air flow control (P104)
The flow rate setpoints are configurable: Intake flow rate setpoints 1 / 2 (P112, P113) and exhaust flow rate setpoints 1 / 2 (P128, P129)
The PID for the intake motor control is managed via P114 to P116, and the exhaust motor control via P130 to P132
Intake flow
112
113
114
115
116
Extraction flow
128
129
130
131
132
(%)
Supply air
compensation
lower limit P234
Supply air compensation in deadband = With or Without
Low supply air temperature compensation setpoint in deadband
Low supply air temperature compensation proportional band in deadband
High supply air temperature compensation setpoint in deadband
High supply air temperature compensation proportional band in deadband
Supply air temperature low limit threshold
Supply air temperature upper limit threshold
Return air temperature low limit threshold
Return air temperature upper limit threshold
Room temperature low limit threshold
Room temperature upper limit threshold
Air intake fan flow rate setpoint 1
Air intake fan flow rate setpoint 2
Air intake fan flow control PID proportional band (P)
Air intake fan flow rate control PID integral time (I)
Air intake fan flow rate control PID derivative time (D)
Air extraction fan flow rate setpoint 1
Air extraction fan flow rate setpoint 2
Air extraction fan flow rate control PID proportional band (P)
Air extraction fan flow rate control PID integral time (I)
Air extraction fan flow rate control PID derivative time (D)
Cooling compensation
(%)
Proportional band P237
Supply air
compensation
upper limit P236
High
threshold
fault P241
Supply air temperature
19
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