<Toc> <Ind>
4-17
TI 05C01E02-01E
1st Edition : Oct. 31, 2001-00
4.4.3 Heater Disconnection Alarm Function
The heater disconnection alarm is the function to detect the deterioration or disconnec-
tion of heater by the current value at ON output in ON/OFF control or in time-propor-
tional control.
This function is available for the controller with the “/HBA” option.
Heater disconnection alarm can be used for the alarm 1 only. The heater disconnec-
tion alarm is output using the alarm
The heater current sensor used here is the “CTL-6-S-H” or “CTL-12-S36-8” sensor of
U.R.D., Ltd.
This sensor is to be purchased by the users themselves.
SSR
Control output:
Relay or
Voltage pulse
Alarm 1 type (AL1) = 25
Alarm 1 setpoint (A1) = 45A
The controller outputs the
heater disconnection alarm
when the heater current is
45A or less.
The current value at
present can be read in the
parameter "HC" (heater
current measured value)
Heater current in normal state
Detecting current error =
–5% –
1digit
The setpoint for heater detecting
current is —10% of the current value at
normal state
PV input
Alarm 1
Heater disconnection detection
200V AC
10kW
CT
Heater
Furnace
10000W
200V
= 50A
T/C
< Example 1> Using one heater of 200V AC, 10kW
SSR
Control output:
Relay or
Voltage pulse
Alarm 1 type (AL1) = 25
Alarm 1 setpoint (A1) = 60A
The controller outputs the
heater disconnection alarm
when the heater current is
45A or less.
The current value at
present can be read in the
parameter "HC" (heater
current measured value)
Heater current in normal state:
Heater current in one wire
disconnection:
Detecting current error =
–5% –
1digit
The setpoint for heater detecting
current is —10% of the current value
at normal state
PV input
Heater disconnection
alarm
Heater disconnection detection
200V AC
5kW
5kW
5kW
CT
Heater
Furnace
5000W
200V
=
x 3
75A
T/C
< Example 2 > Using three heaters of 200V AC, 5kW
5000W
200V
=
x 2
50A
Alarm 1
Summary of Contents for UT130
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