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| Main Controller: 25x500 Segment Programmable
Chapter 7
|
7-46
305435H03
3504 Controller HOME display
Beacon Display and Description
Beacon
Description
OP1
In a single loop controller OP1 indicates when HEAT is ON
MAN
MAN illuminates if Loop 1 is in manual mode.
(The outputs from the controller are connected to devices on the plant
which cause the heating (or cooling) demand to be adjusted resulting in
a change in PV which, in turn, is measured by the sensor. This is
referred to as closed loop control.)
ALM
If an alarm occurs, the red alarm beacon flashes. This is accompanied
by a message showing the source of the alarm, for example 'Abs HI'.
To acknowledge press
RUN
Illuminates when program running – flashing indicates End
HLD
Illuminates when program held
H
Flashes when H communication is active
A/MAN
Toggles the selected loop between Auto and
Manual operation. Manual operation means that the controller output
power is adjusted by the user. The input sensor is still connected and
reading the Process Value (PV) but the control loop is open. Auto means
that the controller is automatically adjusting the output to maintain
control, i.e., the loop is closed. If the controller is in manual mode,
'MAN' light will be indicated. If the controller is powered down in
Manual operation, it will resume this mode when it is powered up
again.
and
.
1500°C Tube Furnace
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