B&B 1TT - Inputs and Outputs; Heating Control

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1TT!–TIMER!+!TERMOREG OLATO RE!-!Reference!Manual!!-!Pag.!2!di!7!
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!!!Inputs!and!Outputs!:!
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The!1TT!device!has!an!input!to!show!the!temperature!(PV)!and!two !digital!o utp uts !(OU T !an d!!AL AR M).!
Timer!relay!contact!!
The!small!clamps!are!used!as!in!the!following!table:!
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!1t!regulation !cha nn el!(SP )!
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Probe!input!
TC!1!!!!!!(3!-!!!4+)!
Output!
SP!!!!!!!!!!(19!-!20)!
Alarm!
AL!!!!!!!!!!(17!-!18)!
Timer!relay!contact!
Relè!!!!!!!(15!-!16)!
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Heating control:
If!the!adjustment!ch a n n e l!h a s!b e e n !se t!t o !h ea t !m o d e ,!th e !t emperature !co n t ro l!is!obtained!by!the!complete !PID!
algorithm!or!the!ON-OFF!algorithm!with!hysteresis.!
The!Act!parameter!must!be!set!to!Hot!in!order!to!select!the!heating!action:!the!activation!of!the!control!output!causes!
an!increase!in!temperature!because!it!is!connected!to!a!heating!element!.!
The!selection!is!mad e!b y !se tt ing !t he !proportional!band!(!PB!)!:!
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Setting!value!0!(!zero)!will!enable!the!ON!–!OFF!adjustment!
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Setting!any!value!other!than!0!will!enable!the!PID!adjustment!
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The!aforementioned!settings!are!summarized!in!the!table!below:!!
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Simbolo!
ON-OFF!
PID!
Proportional!Band!
PB!
!If!is!set!to!0!it!will!e n a b le!ON-OFF!
PB!>!0!–!proportional!band!PID!
Integral!Time!
Ti!
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Integral!Time!PID!
Derivative!Time!
Td!
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Derivative!Time!PID!(Td=-1!automatic!Td=!Ti/4)!
Positive!Hysteresis!
HSO!
>!0.1°C!
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Negative!Hysteresis!
HSU!
<!0.1°C!
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Output!Time!od!Cycle!
Tc!
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From!0!(zero)!to!999”!
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