User Guide

Operating Manual alpha DO 1000
37
12.3 Appendix 3 - Explanation on the Function of Hysteresis
SP1 Set to LO
1
0
.
0
1
0
.
5
1
00
.
0
1
00
.
5
REL
A
YOFF
HYSTERESIS B
A
ND
FORWARD DIRECTION
RE
V
ERSE DIRECTION
SP1
SP2
REL
A
YON
SP2 Set to HI
mS
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.