Specifications

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3BUS 208 000 R1301 115Measurement Setup
Temperature Controller Setup for Basis Weight,
Ash, and Caliper Sensors
Temperature control maintains the measurement area environment for critical
internal components and controls the temperature of the external air column (CAP).
Standard operating conditions include mill air temperature environments that vary
between 10
°C and 85 °C and sheet temperature up to 148 °C. The environment
for internal components and the temperature of the external air column are
controlled by the microcontrollers in the ABB Smart Processing Center (ASPC).
The software control has an accuracy of
±2 °C and will maintain the set point within
a precision of 0.5
°C. Controller set up is done at the Service Workstation using
the Caliper, Ash, and Basis Weight Health Reports. See
Figure 6-3 on page 116 for an example of the Basis Weight Health Report (the Ash
Health Report is similar). For instructions on how to use the Health Reports, see
“Operation of NT Workstation Health Reports” on page 112. Do not change the
kp, ki, or kd constants without consulting a specialist.
Temperature controller tuning parameters are determined by the nature of the
thermistor type and the immediate heating environment involved. Use the Caliper,
Ash, and Basis Weight Health Reports to make the appropriate entries.
Temperature target should be between 45 °C and
65 °C (never above 65 °C) or electronics damage may
occur. Set temperature about 10 to 20 degrees cooler
than the temperature four inches from the sheet.