4
User Manual
Zenex Pro
Table 2.1
Message
PV Error Type
Open
Sensor / RTD broken
Under-range
PV below Min. Range
Over-range
PV above Max. Range
CONTROL/ALARM STATUS UNDER PV ERROR CONDITIONS
a) The tuning, if in progress, is aborted.
b) The Soak Timer, if in progress, enters in Pause (halt) state.
c) All the control outputs are switched off.
d) For Alarm activation, the under-range condition is treated as minimum PV, whereas the over-range and open conditions
are treated as maximum PV. Thus, Process High, positive Deviation Band and Window Band alarms activate under
Over-
range/Open error
. Similarly, Process Low, negative Deviation Band and Window Band alarms activate under
Under-
range error
.
OPERATOR PAGE AND PARAMETERS
The controller provides a separate page that contains parameters that require frequent settings by the operator. The page is
called Operator Page and the parameters are called Operator Parameters. The availability of operator parameters is
controlled at supervisory level and these parameters are not affected by the master lock status.
Accessing Operator Page & Adjusting Parameters
Step through the following sequence to open the operator page and to adjust the operator parameter values.
1. Press and release PAGE key. The Lower Readout shows PAGE and Upper Readout shows 0.
2. Press ENTER key. The Lower Readout shows prompt for the first available operator parameter and the Upper Readout
shows value for the parameter.
3. Use UP/DOWN keys to adjust the value and then press ENTER key to store the set value and scroll to next parameter.
The controller automatically reverts to MAIN Display Mode upon scrolling through the last operator parameter. Alternatively,
use PAGE key to return to MAIN Display Mode.
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.
