CleaverBrooks Hawk 1000, Руководство по эксплуатации

Страница: 69 / 82

Hawk 1000 Section 5 — Commissioning
Part No. 750-366 5-15
Revert to Pilot Pressure must be greater than the boiler operating Setpoint or boiler On Point, whichever is
greater.
Figure 5-26. Revert to Pilot
Initiated by digital input
If ‘Initiate by digital input’ is selected, the above screen will not be shown; Revert to Pilot will be initiated when
digital input I:5.7 ALFCO is OFF.
5.8 O2 Trim
If O2 Trim was selected and an analyzer specified during system configuration, the <Flue Gas O2 Control>
button will appear on the Main screen.
Figure 5-27.
O2 Trim is accomplished by means of the air actuator, or by the VFD if present (if VFD is in Bypass, the air
actuator is used). A manual operating mode is provided for diagnostic or testing purposes.
The CB O2 analyzer requires calibration on power up, or if one week has elapsed since the last calibration. If
using the Yokogawa analyzer, the PLC will expect a “Sensor OK” input from the analyzer at input I:5.2.
Once the O2 sensor is calibrated or “Sensor OK” input is on, the O2 setpoint is captured when setting
combustion curves.
PID control of O2 Trim is provided. Values can be adjusted by pressing <Adjust Gains>. Defaults are P=3,
I=5, and D=0.