4
User Manual
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Figure 2.3 (b)
Figure 2.3 (a)
Target
Ramp Set-point
Balance
Soak Time
Figure 2.2 (b)
Figure 2.2 (a)
Segment
Type
Ramp
Segment
Number
2
Segment
Type
Soak
Segment
Number
3
The Lower Readout also facilitates viewing the information about the current profile segment viz.; the Segment Number,
Segment Type (ramp / soak) and the Target Set-point (if current segment is ramp) or the Balance Time (if current segment is
soak).
Upon keeping the UP Key pressed, the Lower Readout shows the Segment Type and Segment Number as shown in Figure
2.2 (a) & 2.2 (b).
Upon keeping the DOWN Key pressed, the Lower Readout shows the Target Set-point (if current segment is ramp) or the
Balance Time (if current segment is soak) as shown in Figure 2.3 (a) & 2.3 (b).
Note :
If Profile Cycle is in progress; the controller is always in Auto Mode. That is, Manual Mode selection is suppressed.
Table 2.1
PV above Max. Range
PV below Min. Range
Upper Readout
Error Type
Cause
Thermocouple / RTD broken
Sensor Open
Under-range
Over-range
PV Error Indications
The PV Error ype is flashed on the Upper Readout. For different rror Types and the auses, refer Table 2.1 below.
T
E
C
CONTROL / ALARM STATUS UNDER PV ERROR CONDITIONS
a) The tuning, if in progress, is aborted.
b) The Profile Cycle, if in progress, enters in HOLD state.
c)
or
error condition, all the control outputs are switched off. However, under
While in
Over-range
Under-range
Sensor Open
error, the PID control output power is maintained at the value set for the parameter “Sensor Break Output Power” on
PAGE-12.
d) For Alarm activation, the
condition is treated as minimum PV, whereas the
and
Under-range
Over-range
Sensor Open
conditions are treated as maximum PV. Thus, Process High, positive Deviation Band and Window Band alarms activate
under
error. Similarly, Process Low, negative Deviation Band and Window Band alarms activate
Over-range/Sensor Open
during
Under-range
error.
