Omron E5AC-T User Manual page 329

6 Parameters
Set
value
17
*1 With set values 1, 4 and 5, the upper- and lower- limit values can be set independently for each alarm
type, and are expressed as "L" and "H."
*2 Set value: 1 (Upper- and lower-limit alarm)
Case 1
L H SP
H < 0, L > 0
|H| < |L|
*3 Set value: 4 (Upper- and lower-limit range)
Case 1
L H SP
H < 0, L > 0
|H| < |L|
*4 Set value: 5 (Upper- and lower-limit alarm with standby sequence)
• For the upper- and lower-limit alarms in cases 1 and 2 above, the alarm is always OFF if
upper- and lower-limit hysteresis overlaps.
• In case 3, the alarm is always OFF.
*5 Set value: 5 (Upper- and lower-limit alarm with standby sequence)
• The alarm is always OFF if upper- and lower-limit hysteresis overlaps.
*6 Refer to Standby Sequence Reset on page 6-83 for information on the operation of the standby
sequence.
*7 Refer to 5-10-1 Loop Burnout Alarm (LBA).
*8 Refer to PV Change Rate Alarm on page 4-60.
*9 When heating/cooling control is performed, the MV absolute-value upper-limit alarm functions only for
the heating operation and the MV absolute-value lower-limit alarm functions only for the cooling
operation.
• If the Controller is equipped with HB/HS alarm detection, the Alarm 1 Type is not displayed for the
default settings. To use alarm 1, set an output assignment to alarm 1. (Refer to 4-6-3 Assigned
Output Functions (Assigning Control Outputs Is Not Supported for Position-proportional Models.).)
6 - 68
Alarm type
When alarm value
X is positive
MV absolute-value Standard Control
*9
lower-limit alarm
ON
OFF
Heating/Cooling
Control (Cooling
MV)
ON
OFF
Case 2
SP L H
H > 0, L < 0
|H| > |L|
Case 2
SP L H
H > 0, L < 0
|H| > |L|
Alarm output operation
When alarm value
X is negative
Standard Control
X X
ON
MV OFF
0 0
Heating/Cooling
Control (Cooling
MV)
Always ON
X
MV
0
Case 3 (Always ON)
H < 0, L < 0
H SP L
H < 0, L > 0
|H| ≥ |L|
H L SP
H > 0, L < 0
SP H L
Case 3 (Always OFF)
H < 0, L < 0
H SP L
H < 0, L > 0
|H| ≥ |L|
H L SP
H > 0, L < 0
|H| ≤ |L|
SP H L
E5@C-T Digital Temperature Controllers User's Manual (H185)
Description of function
This alarm type turns ON
the alarm when the
manipulated variable (MV)
MV
is lower than the alarm
value (X).
|H| ≤ |L|