Yokogawa Electric Corporation - TC10-L - ENGINEERING MANUAL - PAG. 9
[25] AL1d - Alarm 1 delay
Available:
When [19] AL1t is different from “nonE”.
Range:
From oFF (0) to 9999 seconds.
Note:
The alarm goes ON only when the alarm condition
persists for a time longer than [25] AL1d time but the
reset is immediate.
]
AL2 Group - Alarm 2 parameters
[26] AL2t - Alarm 2 type
Available:
Aways.
Range:
nonE = Alarm not used;
LoAb = Absolute low alarm;
HiAb = Absolute high alarm;
LHAo = Absolute band alarm with alarm indication
out of the band;
LHAi = Absolute band alarm with alarm indication
inside the band;
SE.br = Sensor break;
LodE = Deviation low alarm (relative);
HidE = Deviation high alarm (relative);
LHdo = Relative band alarm with alarm indication
out of the band;
LHdi = Relative band alarm with alarm indication
inside the band.
Note:
The relative alarm are “relative” to the current set
point.
[27] Ab2 - Alarm 2 function
Available:
When [26] AL2t is different from “nonE”.
Range:
0 to 3 with the following rule:
+1 =
Not active at power up;
+2 =
Relative alarm not active at set point change.
[28] AL2L - For High and low alarms it is the low
limit of the AL2 threshold
- For band alarm it is low alarm threshold
Available:
When [26] AL2t is different from “nonE”.
Range:
-1999 to [29] AL2H engineering units.
[29] AL2H - For High and low alarms it is the high
limit of the AL2 threshold
- For band alarm it is high alarm threshold
Available:
When [26] AL2t is different from “nonE”.
Range:
From [28] AL2L to 9999 engineering units.
[30] AL2 - Alarm 2 threshold
Available:
When:
[26] AL2t = LoAb Absolute low alarm;
[26] AL2t = HiAb Absolute high alarm;
[26] AL2t = LodE Deviation low alarm (relative);
[26] AL2t = HidE Deviation high alarm (relative).
Range:
From [28] AL2L to [29] AL2H engineering units.
[31] HAL2 - Alarm 2 hysteresis
Available:
When [26] AL2t is different to “nonE” or [26] AL2t
is different from “SE.br”.
Range:
1 to 9999 engineering units.
Note:
For other details see [24] HAL1 parameter.
[32] AL2d - Alarm 2 delay
Available:
When [26] AL2t type is different form “nonE”.
Range:
From oFF (0) to 9999 seconds.
Note:
The alarm goes ON only when the alarm condition
persist for a time longer than [32] AL2d time but the
reset is immediate.
]
rEG group - Control parameters
[33] Hi.Lo - Control type:
Available:
Always.
Range:
Hi =
Hi limit;
Lo =
Low limit.
High limit control
When a measured value (PV) exceeds a set point
(SP),“EXCEEDED” [EX]lamp lights, “OUT” lamp turns ON
and the limit output relay (Out 2) is de-energized.
“EXCEEDED” [EX] lamp turns off when PV goes into normal
condition, while the output [OUT] display lamp stays on as
it is (b). The output [OUT] display lamp turns off when a
confi rming operation (rearm) is done by an operator.
The way to confi rm are: pressing
key or by DI1
(according to the <<diS>> parameter setting).
The confi rming operation is not accepted during PV exceeds
SP (D) (during EXCEEDED lamp lights*). State of output
relay is de-energized whenever “OUT” lamp is on.
SP
HYS
PV
(A)
(B)
(C)
(A)
(B)
(D)
EXCEEDED
LAMP
OUT
LAMP
lit
off
OUTPUT
RELAY
confirmation
(accepted)
confirmation
(not accepted)
lit
off
Energized
De-energized
OFF
OFF
OFF
Lit
Lit
OFF
Lit
ON
OFF
ON
OFF
Lit
OFF
When the EXCEED lamp is ON but PV is lower than SP, the
upper display will be in green value and it shows that the PV
is in the hysteresis area.
Low limit control
When a measured value (PV) exceeds a setpoint (SP),
“EXCEEDED” lamp (c) lights, and “OUT” lamp (b) turns ON .
The limit output relay is de-energizedthen.
“EXCEEDED” lamp turns off when PV goes into normal
condition, while the output (OUT) display lamp stays on
as it is. The output (OUT) display lamp turns off when a
confi rming operation is done by an operator.
The way to confi rm are:
- pressing
key or
- by DI1 (according to the <<diS>> parameter setting).
The confi rming operation is not accepted during PV exceeds
SP (D) (during EXCEEDED lamp lights*). State of output
relay is de-energized whenever “OUT” lamp is on.
