Setpoints
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MXD70 Setpoints, Current Outputs, and
Digital Inputs Configuration Guide
Setpoints
Setpoint Trigger: High – Hysteresis
Setpoint Trigger: Low – Hysteresis
Hysteresis
A facility to apply hysteresis to the setpoint level
allows the user to avoid setpoint “Chatter” when the
sensor input level approaches the setpoint level.
“Chatter” is caused when the sensor input is
sufficiently close to the set point value and noise on
the signal repeatedly crosses the set point level, thus
causing the relay to switch on and off rapidly.
The hysteresis level should therefore be set to be
greater than the input noise level.
The Hysteresis value is a percentage of the setpoint
value applied both + and – to the setpoint. For
example, if the setpoint was 10.00 and the Hysteresis
was 1% then the hysteresis band would operate from
9.90 to 10.10.
Hysteresis operates as follows:
Trigger High – The setpoint is inactive until the
reading is greater than the Setpoint High + (Setpoint
High X Hysteresis %). It remains active until it goes
below Setpoint High – (Setpoint High X Hysteresis %).
Trigger Low – The setpoint is inactive until the
reading is less than the Setpoint Low – (Setpoint Low
X Hysteresis %). It remains active until it goes above
Setpoint Low + (Setpoint Low X Hysteresis %).
Trigger Band – The setpoint uses both high and low.
Note. Hysteresis is only available when setpoint
trigger is set to High, Low or Band.
/ – Increase / Decrease Digit
– Select Next Digit
EXIT
– Cancel
– Save Value
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