Woodward 3171A, Руководство по эксплуатации продукта, Страница: 26 / 47

EM35MR1/3171A Gas Valve Manual 26731
16 Woodward
Chapter 5.
Troubleshooting
General
Faults in the governing system are usually revealed as speed variations of the
prime mover, but it does not necessarily follow that such speed variations
indicate governing system faults. Therefore, when improper speed variations
appear, check all components including the prime mover for proper operation.
Problems with the EM/valve assembly will usually show up as faults in the driver.
Refer to the EM 24 V Driver manual (26159) for detailed fault information.
Overcurrent trips experienced by the driver can be caused by driving the valve
into (or operating too close to) the mechanical stops. These stop screws are
used for calibration purposes only and are backed out of the valve operating
range before shipment to the customer.
Procedure for EM35 Actuator Field Replacement
The EM35 actuator may be replaced in the field without affecting the calibration
of the valve/actuator assembly. This procedure describes the steps necessary to
perform an actuator replacement in the field.
Required Tools:
3/16” ball hex driver, 6” long, 3/8” drive
5/16” ball hex driver, 6” long, 3/8” drive
3/8” drive ratchet
5/16” hex Allen wrench
3/8” drive torque wrench, capable of 33.2 N

m (24.5 lb-ft)