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265

CHAPTER 4 FUNCTIONS

4.28  H

eater D

isco
nnect

ion D

etection F

unction

  

When transistor output is on, whether a heater is disconnected or not can be checked based on a reference heater 
current value (load current value detected by a current sensor (CT)) using this function. A reference heater current 
value and heater disconnection alert current value are compared. When the reference heater current value becomes 
lower than the heater disconnection alert current value, the heater is regarded as disconnected.
Heater disconnection is detected every 500ms. When transistor output is on for 500ms or less, heater disconnection is 

not detected. (CH Heater disconnection detection (b12 of Un\G5 to Un\G8) remains 0 (OFF).) (

Section 3.4.2 (3))
The following is the timing output as an alert.

 • 500ms × Setting value in Heater disconnection/output off-time current error detection delay count (Un\G166)

If a heater is disconnected longer than the time described above, Alarm code (04A

H

)

 

is stored in Write data error 

code (Un\G0). (

 • Q64TCTTBWN
 • Q64TCRTBWN

Follow the instructions below.

Set the current sensor (CT) to be used in CT CT selection (Un\G272 to Un\G279). (

U.R.D.Co., LTD., set CT CT ratio setting (Un\G288 to Un\G295). (

Page 141, Section 3.4.2 (57))

Set the CT input assigned to each channel in CT CT input channel assignment setting (Un\G264 

Monitor CT Heater current process value (Un\G256 to Un\G263) and check the current value of 

Set the value monitored in CT Heater current process value (Un\G256 to Un\G263) in CT 

 at the rate of the reference heater current value (%) in CH Heater disconnection 

Page 123, Section 3.4.2 (32))

*1

For details on the output off-time current error detection function, refer to 

Page 269, Section 4.29.