NOVA541
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Forward and Reverse Control Action
4-2-2 Output control direction (O.ACT)
▪ The direction of the control action : Reverse action (REV), Forward action (FWD).
▪ When O.ACT = REV, and PV < SP, output will be ON for RELAY or will increase for SSR, SCR
type. When O.ACT = FWD, the direction of control action is quite the opposite.
Symbol
Parameter
Setting range
Display
Unit
Default
O.ACT
Output Direction
REV, FWD
Always
ABS
REV
4-2-3 Output period (Cycle Time)
▪ For Relay or SSR type, cycle time is single ON + OFF time and MV is the ON-time ratio with
respect to the cycle time. As cycle time increases, the frequency of On/Off action decreases.
Generally, Cycle Time is 30 sec for a relay output, and 2 sec for a SSR considering life time.
▪ CT is for HEAT and CTc is for COOL output.
Symbol
Parameter
Setting range
Display
Unit
Default
CT
Heat Cycle Time
1 ~ 300 sec
Always
ABS
2 sec
CTc
Cool Cycle Time
H/C Type시
Control Out (MV)
100%
0%
Deviation (PV-SP)
+
-
Reverse action
Forward action
MV increases when PV
is lower than SP
제어출력이 증가합니다.
MV increases when PV is
higher than SP.