Setting Heater Break Alarm - YOKOGAWA UT Advanced UT32A User Manual

11.7 Setting Heater Break Alarm
Description
Heater Break Alarm Function
11-18
Either of heater break alarm function or heater current measurement function can be
selected.
The heater break alarm function measures the heater current, and outputs the heater
break alarm if the current is less than the heater break detecting point.
The heater break alarm function can be used only for ON/OFF output (relay output) or for
time proportional output (relay output, voltage pulse output). It cannot be used for current
output.
In Heating/cooling control,
Heater break alarm for the heating-side or cooling-side can be selected in heating/cooling
control.
Timing which detects the heater break alarm is as follows.
• For ON/OFF output:
Heater break is detected when control output is in On-state. (Heater break is not
detected when control output is in Off-state.)
• For time proportional output:
When On-state time of control output is 130 ms or longer, heater break is detected.
Heater break is detected between 20 ms and 120 ms after control output turns on.
Heater current value is detected every 200 ms while control output turns on.
Cycle time
Control
ON
output
130 ms
Control
75%
output
However, preset output = 0% in STOP.
Heater break detecting point
Set a detecting point (setpoint) of heater break alarm.
The heater break alarm is output if the measured current is less than the detecting point
(setpoint).
Current Transformer Winding Number Ratio
The coil winding number ratio of current transformer (CT ratio) can be set.
Example: Set the CT ratio "800" for the CTL-6-S-H manufactured by U.R.D. Co., Ltd.
Cycle time
ON
RUN→STOP
OFF
Turn off the power
supply for heater
after the cycle time in
progress elapses.
Heater break alarm may
occur if turning off the
power supply for heater
here (On state).
0%
Time
IM 05P01D31-01EN