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grammed input range.
The input range can be anywhere between -1999 and
9999 units and must be programmed in the lower limit
of input range and the upper limit of input range para-
meters with decimal place values. Enter a Decimal
Point Position code dependent on the desired resolu-
tion, the input type, and the programmed input range.
Setting:
0 -None
1- Tenths of a unit
2 - Hundredths of a unit
PVOF Process Variable Offset: The Process variable Offset
is the amount by which the indicated process variable
is shifted in a positive or negative direction. Both the
indicated as well as the measured process variable
will be changed. This parameter can be used to cor-
rect for differences in sensors, sensor placement, and
standardization problems. Enter a value which is the
difference between the measured process value and
the actual process value of the system.
Setting range: -10 – 10% of full scale, set in Eng. units
SVOF Setpoint Variable Offset: The Setpoint Variable Offset
is that amount of offset which shifts the measured set-
point variable in a positive or negative direction. The
measured setpoint variable is changed but the indicat-
ed setpoint variable remains unchanged. Be careful
when using this variable because what you see as the
setpoint variable may be very different from the actual
setpoint variable.
Setting range: -50 – 50% of full scale, set in Eng. units
Indicated Setpoint Variable is Unchanged
Measured Setpoint Variable is Changed
P-F
C/F Selection: The C/F Selection is that function which
scales the process variable and other setting variables
to either the Celsius or Fahrenheit scale. If using the
controller to control a process other than temperature
using the current/voltage input model, the C/F
Selection is not important because the scaling is done
using the lower limit of the input range and upper limit
of input range parameters. If using the
thermocouple/RTD (Pt100) input model, however, the
C/F Selection is important in scaling the controller's
parameters.
Setting: °C or °F
FUZY Fuzzy Logic Control: Employing Fuzzy Logic Control in
addition to PID control eliminates system overshoot
and effectively suppresses fluctuation of the process
variable due to external disturbances. This function
may be enabled even during auto-tuning. Note that
fuzzy control is not effective in units with dual outputs,
due to the complexity of the process. Fuzzy control is
also inhibited while the Ramp/Soak function is in oper-
ation.
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ADJ0 Input Calibration: This function is used for input cali
ADJS bration by the user in a simple manner. Calibration is
effected by applying signal for zero and span points of
the input range being used and then by setting errors.
The user calibration function is an independent func-
tion and the instrument can easily be reset to condi-
tions prior to delivery.
Example:
Input range 0-400°C
Indication at 0°C : -1°C
Indication at 400°C: 402°C
Change ADJ0 to 1 and ADJS to -2 to correct the error.
The instrument can be set back to factory values by
setting ADJ0 and ADJS to 0.
dSP1 Parameter Mask function: This function is used to indi-
to
to
vidually mask the display of parameters that are not
dSP7 used for your application, or parameters that are not
to be accessed by the operator. To mask or unmask a
parameter appropriate values should be selected from
the DSP Assignment table.
Example 1: To mask parameter P
1) Determine the dSP value for P from the Quick
Reference guide. P = dSP1 – 2
2) Add 2 to the existing dSP1 value.
Example 2: To display/unmask the parameter P-F
1) Determine the dSP value for P-F from the Quick
Reference guide. P-F = dSP6 – 64
2) Subtract 64 from the existing dSP6 value.
ERROR MESSAGES
Error
Indication
Cause
1. Thermocouple burnt out.
2. RTD (A) leg burnt out.
3. PV value exceeds P-SU
by 5% FS.
1. When RTD (B or C) is
burnt out.
2. When RTD (between
A and B, or between
A and C) is shorted.
3. When PV value is below
P-SL by 5% FS.
4. When analog input wiring
is open or short.
When PV value goes below
-1999.
HB lamp
Heater break condition
ON
When the setting of
P-SL/P-SU is improper
Fault in the unit
15
Control Output
When the burn-out
control output is set for
lower limit (standard):
OFF, or 4mA or less.
When the burn-out
control output is set for
upper limit: ON, or 20mA
or less.
Control is continued
the value reaches -5% FS
or less, after which burn-
out condition will occur.
Normal control output
for heating is continued.
OFF, or, 4mA or less.
Undefined. Stop use
immediately.
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