VC-6000
TM
Compact monitor Part D Setting of limit setpoints and time delays
- 30 - C100585.002 Communication Vers. 03 © VC-6000
TM
Compact monitor Dec 09
10.4 Setting the hysteresis
The hysteresis is a further parameter of the Monitor block. To be changed it
must be selected as a parameter and then changed in the Display & Editing
level.
Similar to the limit setpoint, the hysteresis is also a continuously variable
value. Entry of the value is done in the same manner as the limit setpoint.
Setting advice:
After a limit value has been violated (in the positive or negative
direction) the measured value must decrease (or increase) by a value
greater than the hysteresis value before the limit violation can be reset.
As a rule the hysteresis value can be set to „0.00“. Only in a case
where very short relay time delays have been set should the hysteresis
value be set higher than „0.00“ to prevent any „fluttering“ (repeat
violations) of the limit relay due to small variations in the measured
value.
10.5 Setting the time delay
The time delay is a further parameter of the Monitor block. To be changed it
must be selected as a parameter and then changed in the Display & Editing
level.
Similar to the limit setpoint the time delay is also a continuously variable
value. Entry of the value is done in the same manner as the limit setpoint.
Setting advice:
The time delay is always a compromise between a fast reaction time in
the case of a genuine event, and security against false alarms due to a
short-term high measurement that is a single, unimportant impulse.
With a setting of very short time delays the hysteresis value should be
set to a value higher than „0.00“.
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