V5.00
25832_EDEBD
A0289-5020-1_EN
38
The result is the following:
The contact switches if the trend power is greater than 90 kW (90% of the target value)
and the message I20 prewarning contact active is issued.
The hysteresis for switching back is 10kW, meaning that the contact will switch back if the
trend power is 80 kW (90% of the target value minus a hysteresis of 10kW).
The contact remains switched on for 30 seconds even if the trend power falls under 80
kW during this period.
After the contact is switched off, the next switching operation is carried out after a mini-
mum of 60 seconds, as the minimum off time is still applicable.
The message
I20 prewarning contact active
is issued when the contact is switched off.
When a measurement period is first started, the prewarning contact function is locked
for the first 10 minutes (measurement period time-out). This means that the prewarning
contact is not active or is deactivated if the minimum on time has not yet elapsed.
The measurement period time-out is always started at the beginning of a measurement
period. The minimum on and off times take priority over the measurement period time-
out.
Description of parameters