Instruction manual

Instruction manual αlpha DO 2000
39
11.3 Appendix 3 – Simple explanation on the function of hysteresis
The controller relay activates when the set-point is reached. In the reverse direction, it does
not de-activate when the value reaches the set-point. Instead, it continues to be active till the
value reaches the amount set by the Hysteresis band.
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RELAY OFF
HYSTERESIS BAND
FORWARD DIRECTION
REVERSE DIRECTION
SP1
SP2
RELAY ON
SP1 Set to LO
SP2 Set to HI
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