ABB ACS 400 - PID Control (2)

102 ACS 400 User’s Manual
Figure 41 Operating data supervision using relay outputs, when LOW>HIGH.
LOW (3202)
HI (3203)
energized=1
de-energized=0
energized=1
de-energized=0
A
B
Value of supervised parameter
t
A = Parameter 1401 RELAY OUTPUT 1 (1402 RELAY OUTPUT 2) value is SUPRV1
OVER or SUPRV2 OVER.
B = Parameter 1402
RELAY OUTPUT 1 (1402 RELAY OUTPUT 2) value is SUPRV1
UNDER or SUPRV2 UNDER.
Note! Case LOW>HIGH represents a special hysteresis with two separate
supervision limits. Depending on whether the supervised signal has gone below
value HIGH (3203) or above value LOW (3202), determines which limit is being
used. Initially HIGH is used, until the signal goes above value LOW. After this the
limit used is LOW, until the signal goes back below value HIGH.
A = Initially the relay is de-energized.
B = Initially the relay is energized.
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