8. PARAMETER DESCRIPTION
IMR02C15-E4
8-34
LBA deadband (LBD)
Factory default setting:
The screen is displayed.
The LBA deadband gives a neutral zone to prevent the control loop break alarm
(LBA) from malfunction caused by disturbance.
Data range Factory set value
0 to Input span 0
LBD displays when PID control is specified and the value “11: Control
loop break alarm (LBA)” is set to Event 1 type (ES1) through Event 4
type (ES4) (P. 8-101) at Function blocks from F41 to F44 in the
Engineering mode.
LBD is not displayed when Heat/Cool PID control is specified.
LBD is not displayed when the block selection at F07 [S.F07] (P. 8-79) is
set to “1: No display” in the Engineering mode.
Related parameters
Parameter setting mode:
• Control loop break alarm (LBA) time (P. 8-32)
Engineering mode:
• LBA deadband (LBD) (P. 8-78)
Description of function
The LBA may malfunction due to external disturbances. To prevent malfunction due to external
disturbance, LBA deadband (LBD) sets a neutral zone in which LBA is not activated. When the
Measured value (PV) is within the LBD area, LBA will not be activated. If the LBD setting is not
correct, the LBA will not work correctly.
*
TC/RTD input: 0.8 °C [°F] (fixed) Voltage/Current input: 0.8 % of span (fixed)
: During temperature rise: Alarm area During temperature fall: Non-alarm area
B: During temperature rise: Non-alarm area During temperature fall: Alarm area
LBD differential gap *
Alarm area Alarm area
Non-alarm area
A B
Set value (SV) LBD set value
Low High
Continued on the next page.
LBD
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