Taie FU400 - Heater Break Alarm

11.4 Heater Break Alarm
Description
The HBA (Heater-Break-Alarm) function measures the heater current and displays the measured current value on the
parameter HBAC upper area so that the heater status can be monitored at any time.
When it is detected that the heater is disconnected or the heater current is abnormally reduced, an alarm message may
be immediately output to notify the user.
Function Diagram
PV
KBA(
SV
10
.
0
OUT1 OUT2 ATAL1 AL2AL3 MANPRO
HBA alarm
OUT1 %
0 20 40 60
80100
SET A/M
TAIE
FY900
Control output
+
SSR
-
AC power
Sensor input
CT
SC 80-T
Heater
se
nsor
Electric furnace
Parameter
Parameter Symbol Content
Range
Default Level
Hide/
MAX
MIN Display
HBA current setting value
INP2=4
*HBAC
Upper : heater current display
100.0 0.0 1.0 Level 1
&
Down : current settin
g
value
ALD1=9
unit : ampere(A)
* when ALD1=9，original AL1 become HBAC display
HBA operating conditions
1. Heater current is less than the setting of HBAC
2. OUT1 output exceeds 90%
3. The conditions of 1 & 2 above are established and continue to exceed 20 seconds
Examples
Heating system with SSR as control element, set HBAC=1.0(down area)
1. The heater current display value HBAC = 0.0(upper area), when a heater disconnection occurs
 The heater current is less than the set value of HBAC=1.0. At this point, the operating condition 1 is satisfied.
2. The heater no longer heats when the heater disconnection occurs, and the gap between the PV and SV will become
larger and larger.
 The manipulated value of OUT1 is also getting larger and larger, and eventually exceeds 90%. At this point, action condition
2 is satisfied.
3. The AL1 alarm will be activated when both 1 & 2 conditions are met and continue for more than 20 seconds.
Parameter setting
Level Parameter Set value Description
1 HBAC 1.0 HBA Action Current Set Value (Unit: A)
4 INP2 4 CT current input
3 ALD1 9 HBA Alarm
3 ANL2 -12
Current low-
p
oint calibration value
(each controller calibrate value is different)
3 ANH2 0x4527
Current Hi
g
h-point calibration value
(each controller calibrate value is different)
35 FY/FU operation manual