Watlow PM LEGACY™ Limit Controller
•
87
•
Chapter 8 Features
Note:
The user may only calibrate one sensor type. If the calibrator interferes with open thermo-
couple detection, set Sensor Type
sEn
in Setup Page
sEt
, Analog Input Menu
ai
to millivolt
ЛЏ u
instead of Thermocouple
tC
to avoid interference between the calibrator and open thermocouple
detect circuit for the duration of the calibration process. Be sure to set sensor type back to
the
thermocouple type utilized.
Note:
The Electrical Measurement value will be in the units that are selected. i.e. - Millivolts,
volts, milliamps, or ohms.
1. Disconnect the sensor from the controller.
2. Record the Calibration Offset
i.Ca
parameter value in the Operations Page
opEr
, Analog Input
Menu
ai
then set value to zero.
3. Wire the precision source to the appropriate controller input terminals to be calibrated. Do not
have any other wires connected to the input terminals. Please refer to the Install and Wiring sec-
tion of this manual for the appropriate connections.
4. Ensure the controller sensor type is programmed to the appropriate Sensor Type
sEn
to be utilized
in the Setup Page
sEt
, Analog Input Menu
ai
.
5. Enter Factory Page
fCty
, Calibration Menu
CaL
via front panel or PM LEGACY™ Limit
Configurator Software.
6. Select the Calibration
CaL
input instance to be calibrated. This corresponds to the analog input to
be calibrated.
7. Set Electrical Input Slope
ELi.s
to 1.000 and Electrical Input Offset
ELi.o
to 0.000 (this will cancel
any prior user calibration values)
8. Input a Precision Source Low value. Read Electrical Measurement value
ЛЏu
of controller via PM
LEGACY™ Limit Configurator or RUI. This will be referred to as Electrical Measured Low. Record
low value ______________.
9. Input a Precision Source High value.
10. Read Electrical Measurement value
ЛЏu
of controller via PM LEGACY™ Limit Configurator
or RUI. This will be referred to as Electrical Measured High. Record high value ________.
11. Calculated Electrical Input Slope = (Precision High – Precision Low) / (Electrical Measured
High - Electrical Measured Low) Calculated Slope value ___________
12. Calculated Electrical Input Offset = Precision Low - (Electrical Input Slope * Measured
Low) Calculated Offset value ___________.
13. Enter the calculated Electrical Input Slope
ELi.s
and Electrical Input Offset
ELi.o
into
the controller.
14. Exit calibration menu.
15. Validate calibration process by utilizing a calibrator to the analog input.
16. Enter calibration offset as recorded in step 2 if required to compensate for sensor error.
Setting Electrical Input Slope
ELi.s
to 1.000 and Electrical Input Offset
ELI.o
to 0.000, restores facto-
ry calibration as shipped from factory.
Содержание PM LEGACY PM3
Страница 119: ...Watlow PM LEGACY Limit Controller 119 Appendix...