Super Systems AC20 - Manual (Page 73)

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Example Example Example Example Example for A1.Cn (A2.Cn, A3.Cn) = H.A.
A= alarm condition detection
B= automatic reset of alarm
C= manual reset; the LED gets steady lit, the alarm remains in
the alarm status until the process variable reaches the alarm
threshold minus hysteresis (D).
Flash Flash
A B A
C
D
ON
OFF
Relay out
ON
LED 1(2, 3)
OFF Steady
Alarm
Hysteresis
Alarm
Threshold
Measured
Value
Example Example Example Example Example for A1.Cn (A2.Cn, A3.Cn) = H.A.A.c
A= alarm condition detection
B= automatic reset of alarm
C= manual reset; the LED gets steady lit, the relay output goes
OFF but the LED remains steady lit until the process variable
reaches the alarm threshold minus hysteresis (D).
Alarm
Hysteresis
Measured
Value
Alarm
Threshold
Flash Flash
ON
OFF
Relay out
ON
LED 1(2, 3)
OFF
A B A
C
D
Steady