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Operation:
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【Sensor】detects temperature of return air
for AHU or return water for
fan.
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【Controller】receives the data from sensor,
compares it with setting, and sends a logic signal to
VFD.
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【VFD】receives a signal from controller, and
uses it as an order to control the speed of
motor.
Built-in
logic of controller:
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If the difference between temperature
detected and setting is larger than 3°C , motor will run at 60Hz.
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If the difference between temperature
detected and setting is 2~3°C , motor will run at 50~60Hz.
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If the difference between temperature
detected and setting is 1~2°C , motor will run at 40~50Hz.
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If the difference between temperature
detected and setting is 0~1°C, motor will run at 30~40Hz.
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If the temperature detected is smaller than
setting, two options are available, stop or running at the minimum
speed.
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If minimum flow is required, just set the
value of minimum
frequency.
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If energy saving is mandated, just set the
value of maximum
frequency.
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