Rational SCC Series, Training Manual

Page: 57 / 200

57
SCC
Edition 10-2008a
Clima Plus Control SCC
The calculated humidity inside the cabinet is based on:
1. Voltage output signal P1 (depending on fan motor speed, ref: function test #5)
2. Temperature B4 (thermocouple behind motor mounting plate)
3. RPM signal of the fan motor (via BUS signal)
The offset voltage of P1 (Motor not turning) is appr.: 0.45 - 0.55V
Basic rule: The less humid, the higher is the voltage of P1,
The higher the rpm, the higher the voltage of P1.
Example: SCC 101 E
RPM P1 (approx. Volt)
Dry 1,1
Speed 500rpm Wet 0,7
Combi 0,6
Dry 2.3
Speed 1250rpm Wet 1.7
Combi 1.5
Dry 2.9
Speed 1800rpm Wet 2.4
Combi 1.9
Dry 3,1
Speed 1900rpm Wet 2.5
Combi 2.2
Thermocouple
humidity control
rpm measurement
RPM
B4
Differential pressure sensor
ClimaPlus
P1
Clima Status (approx. value in Pascal)
Indicated values shall NOT be “0” or “85000”
If “0” or “85000” is indicated
re-calibration is needed