5
Symbol
Name
Setting range
Description
Factory set value
Heater break
alarm (HBA) set
value
1
0.0 to 100.0 A
Alarm value is set by referring to input value
from the current transformer (CT).
Used only for single-phase.
0.0
Control loop break
alarm (LBA) time
2
0.1 to 200.0 minutes
Set control loop break alarm (LBA) set value.
8.0
LBA deadband
3
TC/RTD inputs:
0 to 9999 C [ F]
Voltage/Current inputs:
0 to 100 % of input span
Set the area of not outputting LBA.
No LBA deadband functions with 0 set.
Differential gap :
TC/RTD inputs:
0.8 C [ F]
Voltage/Current inputs: 0.8 % of input span
0
Autotuning (AT)
0: AT end or cancel
1: AT start or execution
Turns the autotuning ON/OFF.
0
Proportional band
TC/RTD inputs:
1 (0.1) to span
0.1 C [ F] resolution:
Within 999.9 C [ F]
Voltage/Current inputs:
0.1 to 100.0 % of input span
0 (0.0): ON/OFF action
Set when PI, PD or PID control is performed.
Heat/Cool PID action: Proportional band
setting on the heat-side.
ON/OFF action differential gap:
TC/RTD inputs:
2 (0.2) C [ F]
Voltage/Current inputs: 0.2 % of input span
TC/RTD inputs:
30 (30.0)
Voltage/Current
inputs: 3.0
Integral time
1 to 3600 seconds
(0 second: PD action)
Set the time of integral action to eliminate the
offset occurring in proportional control.
240
Derivative time
1 to 3600 seconds
(0 second: PI action)
Set the time of derivative action to improve
control stability by preparing for output
changes.
60
Anti-reset windup
(ARW)
1 to 100 % of heat-side proportional
band (0 %: Integral action OFF)
Overshooting and undershooting are
restricted by the integral effect.
100
Heat-side
proportioning
cycle
1 to 100 seconds
(Not displayed if the control output is
current output.)
Set control output cycle.
Heat/Cool PID action:
Heat-side proportioning cycle
Relay contact output: 20
Voltage pulse output/
Trigger output for triac
driving: 2
Cool-side
proportional band
1 to 1000 % of heat-side
proportional band
Set cool-side proportional band when
Heat/Cool PID action.
100
Deadband
TC/RTD inputs:
10 to +10 C [ F] or
10.0 to +10.0 C [ F]
Voltage/Current inputs:
10.0 to +10.0 % of input span
Set control action deadband between
heat-side and cool-side proportional bands.
Minus (
) setting results in overlap.
0 or 0.0
Cool-side
proportioning
cycle
1 to 100 seconds
(Not displayed if the control output is
current output.)
Set control cool-side output cycle for
Heat/Cool PID action.
Relay contact output: 20
Voltage pulse output: 2
Set data lock
(LCK)
0100: No set data locked
(All parameters changeable)
0101: Set data locked
(All parameters locked)
0110: Only the set value (SV) is
changeable with the set data
locked
Performs set data change enable/disable.
0100
1
Heater Break Alarm (HBA) function
The HBA function monitors the current flowing through the load by a
dedicated current transformer (CT), compares the measured value with
the HBA set value, and detects a fault in the heating circuit.
Low or No current flow (Heater break, malfunction of the control
device, etc.):
When the control output is ON and the current transformer input value is
equal to or less than the heater break determination point for the preset
number of consecutive sampling cycle, an alarm is activated.
Over current or short-circuit:
When the control output is OFF and the current transformer input value is
equal to or greater than the heater break determination point for the
preset number of consecutive sampling cycle, an alarm is activated.
Precaution for HBA setting:
Displayed only for when HBA is selected as Alarm 2.
HBA is not available on a current output.
Set the set value to approximately 85 % of the maximum reading of the
CT input.
Set the set value to a slightly smaller value to prevent a false alarm if
the power supply may become unstable.
When more than one heater is connected in parallel, it may be
necessary to increase the HBA set value to detect a single heater
failure.
When the current transformer is not connected or the HBA set value is
set to “0.0,” the HBA is turned on.
2
Control Loop Break Alarm (LBA) function
The LBA function is used to detect a load (heater) break or a failure in the
external actuator (power controller, magnet relay, etc.), or a failure in the
control loop caused by an input (sensor) break. The LBA function is
activated when control output reaches 0 % or 100 %. LBA monitors
variation of the measured value (PV) for the length of LBA time. When
the LBA time has elapsed and the PV is still within the alarm
determination range, the LBA will be ON.
Precaution for LBA setting:
Displayed only for when LBA is selected as Alarm 1 or Alarm 2.
No LBA function can be used at Heat/Cool PID control action.
The LBA function can not be activated when AT function is turned on.
The LBA function is activated when control output reaches 0 % or
100 %. The time required for the LBA output to turn on includes both
the time from the initial occurrence of loop failure and the LBA setting
time. Recommended setting for LBA is for the set value of the LBA to
be twice the value of the integral time (I).
If LBA setting time does not match the controlled object requirements,
the LBA selling time should be lengthened.
If setting time is not correct, the LBA will malfunction by turning on or
off at inappropriate times or not turning on at all.
3
LBA Deadband function
The LBA may malfunction due to external disturbances. To prevent
malfunctioning 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 and RTD inputs: 0.8 C [ F] (fixed)
Voltage/Current inputs: 0.8 % of input span (fixed)
A: During temperature rise: Alarm area
During temperature fall: Non-alarm area
B: During temperature rise: 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
Set value (SV)
LBD set value
Low
High
A
B
