Woodward 3171A, Руководство по эксплуатации продукта, Страница: 25 / 47

Manual 26731 EM35MR1/3171A Gas Valve
Woodward 15
Chapter 4.
Actuator/Valve Calibration
EM35MR1 Actuator/3171 Gas Valve with Driver
For calibration details, see the Dry Low Emissions, Fuel Metering Valves:
Warnings, Calibration, and Installation manual (40142).
The EM35MR1 actuator/gas valves used with the digital driver is typically for
applications that require extremely high accuracy, like dry low emissions (DLE)
control. For that reason, all calibration of the actuator/valve assembly is
performed at the factory.
The mechanical stops on the valve limit valve travel and prevent damage to the
valve caused by driving it beyond its normal range. Flow calibration is achieved
using the digital resolver feedback and a valve characterization table. The flow
vs. angle data is determined for each valve during the flow testing and is
recorded on a floppy disk.
No field rigging is required to calibrate the valve. There is a warning tag on the
valve and a warning message on the operator panel stating that the table
identification (serial number and date code) must match the valve identification.
For DLE systems, significant turbine damage, high emissions levels,
release of high-temperature gas, fire, damage to nearby equipment,
injury to personnel, or death may result from incorrect fuel valve
calibration. To correctly operate the fuel metering valve(s), the
NetCon or MicroNet controller must be programmed with the correct
valve characterization curve for the specific valve being used.
Woodward provides the programming information to the valve
purchaser in the form of a data file specifically identified by the valve
serial number and date. The supplier of the application program must
incorporate the valve characterization data file into the application
program by following the procedure described in this manual. Failure
to follow the procedure herein, or any non-Woodward alteration
(including attempt to repair), or damage to the valve, may result in a
change of characteristics leading to the same potential hazards.
Be prepared to make an emergency shutdown when starting the
engine, turbine, or other type of prime mover, to protect against
runaway or overspeed with possible personal injury, loss of life, or
property damage.