AK I/O relay method
Select ‘No’ to the question line ‘Use Adaptive Rail heat’.
Dene how many relays will be used in the control of the rail heat
elements (max 30).
Cycle time - Used to determine what amount of time the relays
are energized, used in combination with the output percentage as
set in the Dew point setpoint.
Dewpoint method
- Calculated dewpoint (Using a combined temperature / humidity
sensor - type: EMHS3-1 is recommended. See below for wiring
example)
- Dewpoint (Utilize direct output from dewpoint sensor)
0%
(0 mins)
100%
50%
(5 mins on)
(5 mins o)
-4.0
8.0
90%
(9 mins on)
(1 min o)
2.0
7.0
Target Dewpoint Range
Example of Target Dewpoint & relay output % ratio
Relay output percentage (based on cycle time
setting)
Example: With a Dew point target range of -4.0 to 8.0°c and the Cycle
time set for 10 minutes the following behavior will be true.
At -4.0°c Dewpoint the relay output will be 0%
At 8.0°c Dewpoint the relay output will be 100%
At 2.0°c Dewpoint the relay output will be 50% of the cycle
time (5 mins on, 5 mins o)
At 7.0°c Dewpoint the relay output will be 90% of the cycle
time (9 mins on, 1 min o)
EMHS -3-1 Humidity Sensor (combined Humidity & Temperature):
12V / 24V supply via I/O modules
0-5V Relative Humidity
Temperature Sensor
AK-SM 850 User Guide Lit. no. USCO.PI.R1.E1.02 © Danfoss 07-2013 37
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