1-3
IM 05P04D41-01EN
Introduction to Functions
1
1.3 Limit Control Functions
In Case of High Limit Control
When PV exceeds a setpoint (SP), "EXCEEDED" lamp lights, and "OUT" lamp turns ON
(point A). The limit control output relay is de-energized then.
"EXCEEDED" lamp turns off when PV goes into normal condition, while "OUT" lamp
stays on as it is (point B). "OUT" lamp turns off when a confirming operation is done by
an operator (point C). The way to confirm is pushing the "RST" key (or by an exeternal
contact, according to the setting of setup parameter CNF). The confirming operation
is not accepted during PV exceeds SP (point D). State of output relay is deenergized
whenever "OUT" lamp is on. (NC terminal: CLOSE, NO terminal: OPEN)
SP
PV
(A)
Confirmation
(accepted)
Hysteresis
EXCEEDED Lamp
OUT Lamp
Output Relay
Operation
(RST key or external contact input)
(B) (C)
(A)
(D)
(B)
Confirmation
(not accepted)
lit
lit
lit
lit
on
on
off
off
off
off
off
off
off
In Case of Low Limit Control
When PV exceeds a setpoint (SP), “EXCEEDED” lamp lights, and “OUT” lamp turns ON
(point A). The limit control output relay is de-energized then.
“EXCEEDED” lamp turns off when PV goes into normal condition, while “OUT” lamp
stays on as it is (point B). “OUT” lamp turns off when a confirming operation is done by
an operator (point C). The way to confirm is pushing the “RST” key (or by an exeternal
contact, according to the setting of setup parameter CNF). The confirming operation
is not accepted during PV exceeds SP (point D). State of output relay is deenergized
whenever “OUT” lamp is on. (NC terminal: CLOSE, NO terminal: OPEN)
SP
PV
(A)
Confirmation
(accepted)
Hysteresis
EXCEEDED Lamp
OUT Lamp
Output Relay
Operation
(RST key or external contact input)
(B) (C)
(A)
(D)
(B)
Confirmation
(not accepted)
lit
lit
on
off
off
lit
off
off
lit
off
off
on
off
Summary of Contents for UT35A-L
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