Siemens RWF40.010A97 - Limit Comparator Function Examples (Ik1-Ik8)

HVAC Products CC1B7865en 05.12.2002 41/57
8. Configuration
Window function: Relay «K6» is active when the measured value lies within a window
about the setpoint (w).
Example: w = 80 °C, AL = 5, HYSt = 2
Measured value rising: Relay «K6» switches on at 76 °C and off at 86 °C.
Measured value falling: Relay «K6» switches on at 84 °C and off at 74 °C.
AL
HYSt
w
Measured value
7865d10e/0300
Output 4
Like lk1, but inverted switching function.
AL
HYSt
w
Measured value
7865d09e/0300
Output 4
HYSt = switching differential of the window edges
AL = interval from setpoint (half the window-width)
Lower limit signaling
Function: Relay inactive when measured value < (setpoint – limit value).
Example: w = 80 °C, AL = 10, HYSt = 2
Measured value rising: Relay «K6» switches on at 71 °C.
Measured value falling: Relay «K6» switches off at 69 °C.
AL
HYSt
w
Measured value
7865d04e/0300
Output 4
Function Ik1
Function Ik2
Function Ik3