CD Automation srl
pag. 26 di 121
11.4
Showing leakage alarm
The alarm condition detected in the measurement of current through the current transformer is indicated
in
OR
on the relay or on the relays assigned to alarm 3.
Il The current sampling is done only if the state's output, which is inserted in the current transformer is
unenergized for at least 200ms:if during the current cycle time is not carried out any sampling, the value
shown by the lower display will be "----".
This view is only present if the group parameter HCEn Hbdu configuration is set to ON.
11.5
Showing loop-break alarm
•
uscita di controllo al minimo e azione
reverse
•
uscita di controllo al massimo e azione
direct
Analogamente, la variabile di processo deve crescere se:
•
uscita di controllo al minimo e azione
direct
•
uscita di controllo al massimo e azione
reverse
La condizione di allarme viene segnalata in
OR
sul relè o sui relè assegnati all' allarme 3.
The loop-break alarm is generated by the dedicated algorithm when the control output is at the minimum /
maximum value and the process variable changes in the time pre-chosen of amplitude below the
threshold set in the configuration.
The process variable must decrease if:
• Control output to the minimum and Reverse Action
• Control output to the maximum and direct action
Similarly, the process variable must grow if:
• Control output to the minimum and direct action
• Control output to the maximum and reverse action
The alarm condition is reported in
OR
on the relay or the relays assigned to the alarm 3.
12
Function “Soft start”
When the instrument is switched on the function "soft start" protects temporarily the limit the output
power. By limiting the heating power of switch on it’s possible to reduce the thermal stress to the heating
elements. The user can configure the time and temperature threshold of the function "soft start".
