Crompton Controls M20 - Manual (Page 33)

32 Advanced Features Emotron AB 01-2551-01r4
Setting margins (windows 21-24)
The margins for the Auto set can be changed manually. After the adjustment,
the Auto set action must be performed again.
Setting hysteresis (window 33)
The hysteresis of an alarm level prevents the alarm relay “chattering” if the load
fluctuates even in a normal “stable” condition. This also applies to a pre-alarm.
This feature is normally only used if the main alarm latch (window 61) is set to
Off. Default = 0%.
Fig. 10 Hysteresis
Protection (Monitor function
window 05)
Window Default
OVER- and UNDERLOAD
(Default)
21: MAX Main Alarm margin 16%
22: MAX Pre-Alarm margin 8%
23: MIN Pre-Alarm margin 8%
24: MIN Main Alarm margin 16%
OVERLOAD
21: MAX Main Alarm margin 16%
22: MAX Pre-Alarm margin 8%
UNDERLOAD
23: MIN Pre-Alarm margin 8%
24: MIN Main Alarm margin 16%
MAX Main Alarm level [11]
MIN Main Alarm level [14]
Relay 1 MAIN Alarm
Hysteresis [33]
P/%
t/s