Heater Break Alarm - Brainchild BTC-2500 User Manual

3 12 Heater Break Alarm

3 12 Heater Break Alarm
A current transformer ( parts No. A current transformer ( parts No.
heater current if a heater break alarm is required. The CT signal is sent to heater current if a heater break alarm is required. The CT signal is sent to
input 2, and the PV2 will indicate the heater current in 0.1 Amp. resolution. input 2, and the PV2 will indicate the heater current in 0.1 Amp. resolution.
The range of current transformer is 0 to 50.0 Amp. The range of current transformer is 0 to 50.0 Amp.
For more detailed descriptions about heater current monitoring, please see For more detailed descriptions about heater current monitoring, please see
Section 3-25. Section 3-25.
Example: Example:
A furnace uses two 2KW heaters connected in parallel to warm up the process. A furnace uses two 2KW heaters connected in parallel to warm up the process.
The line voltage is 220V and the rating current for each heater is 9.09A. If we The line voltage is 220V and the rating current for each heater is 9.09A. If we
want to detect any one heater break, set A1SP=13.0A, A1HY=0.1 want to detect any one heater break, set A1SP=13.0A, A1HY=0.1
A1FN=PV2.L, A1MD=NORM, then A1FN=PV2.L, A1MD=NORM, then
No heater breaks No heater breaks
20 30
10 40
A
0 50
52
CT94-1 CT94-1 ) should be installed to detect the ) should be installed to detect the
1 heater breaks 1 heater breaks
Alarm ! Alarm !
20 30
10 40
A
0 50
UM25001C
2 heaters breaks 2 heaters breaks
Alarm ! Alarm !
20 30
10 40
A
0 50
Heater Break Alarm 1 Heater Break Alarm 1
Setup : IN2 = CT Setup : IN2 = CT
A1FN = PV2.L A1FN = PV2.L
A1MD = NORM A1MD = NORM
A1HY = 0.1 A1HY = 0.1
Adjust : A1SP Adjust : A1SP
A A
Trigger levels : A1SP Trigger levels : A1SP 1/2 A1HY 1/2 A1HY
Heater Break Alarm 2 Heater Break Alarm 2
Setup : IN2 = CT Setup : IN2 = CT
A2FN = PV2.L A2FN = PV2.L
A2MD = NORM A2MD = NORM
A2HY = 0.1 A2HY = 0.1
Adjust : A2SP Adjust : A2SP
A A
Trigger levels : A2SP Trigger levels : A2SP 1/2 A2HY 1/2 A2HY
Limitations : Limitations :
1. Linear output can't use heater break 1. Linear output can't use heater break
alarm. alarm.
2. CYC1 should use 1 second or 2. CYC1 should use 1 second or
longer to detect heater current reliably. longer to detect heater current reliably.
Figure 3.17 Figure 3.17
Heater Break Alarm Heater Break Alarm