3
BASIC OPERATIONS
POWER-UP
Upon power-up all displays and indicators are lit on for approximately 3 seconds. This is followed by the indication of the
controller model name on the Upper Readout and the firmware version on the Lower Readout, for
approximately 1 second.
MAIN DISPLAY MODE
After the Power-up display sequence, the Upper Readout starts showing the measured PV (Process Value) and the Lower
Readout displays the SP (Control Setpoint). This is the MAIN Display Mode that shall be used most often.
Adjusting SP (Control Setpoint)
The SP value can be directly adjusted on the Lower Readout while the controller is in the MAIN Display Mode.
If permitted at Supervisory Level, step through the following sequence for adjusting the SP value :
1. While the Lower Readout shows SP value, press and release UP or DOWN key once. The Lower Readout starts flashing.
2. Use UP/DOWN keys to adjust the SP value.
3. Press and release ENTER key. The Lower Readout stops flashing and the new set value is registered and stored.
Tune / Optimize Indication
The controller self detects the events such as new installation, significant change in SP, etc. for auto tuning itself to the process
under control. Also, the controller can be issued ‘Optimize’ command by the user for optimization of the PID constant values.
While the controller is Tuning/Optimizing, the Lower Readout flashes the message (Busy). The user is advised not to
disturb the process or alter any parameter values while the “Busy” message is being flashed. The “Busy” message
automatically disappears upon completion of Tuning/Optimization.
Timer (Soak) Mode Indication
While Soak Timer is in progress, the front panel indicator ‘S’ flashes if the timer is counting down or glows steadily if the timer is
in wait / hold state.
The Lower Readout can be toggled to display either Balance Soak Time or Control Setpoint (SP), using ENTER key. While the
Lower Readout shows balance soak time the indicator ‘T’ glows.
The Balance Soak time is in either ‘Minutes : Seconds’ or ‘Hours : Minutes’ or ‘Hours’, depending upon the time units selected
for the Soak Timer. If the selected time units are ‘Hours’, then (a) If the balance time is greater than 100 Hours, the time is
shown in ‘Hours’. (b) If the balance time is less than 100 Hours, the time is shown in ‘Hours : Minutes’.
PV Error Indications
The process value is said to be in error if it exceeds the minimum / maximum range specified for the selected Input sensor type
or if the sensor is disconnected (Open or Broken).
The PV Error type is indicated (flashing) on the Upper Readout. For different errors and the causes refer Table 2.1 below.
User Manual
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Section 2
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