ABB ACS140 - Page 80

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Figure 15 Operating data supervision using relay outputs, when
LOW>HIGH.
LOW (3202)
HI (3203)
energised=1
de-energised=0
energised=1
de-energised=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 1401
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-energised.
B = Initially the relay is energised.
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