Flowserve NT3000 Series - Manual (Page 16)

NT 3000 Series Electro-Pneumatic Transducer Module FCD VLAIM0047-00 - 09/04
16
Troubleshooting
Failure Probable Cause Corrective Action
Transducer output is
less than 1.5 psig with
no input signal (output
pressure should be 2.0
psig ±0.5 psig)
1. Supply pressure is low or not connected properly 1. Set supply pressure to recommended value
2. Pressure gauge is faulty 2. Replace gauge
3. Orifice is plugged 3. Replace orifice
4. Transducer filter needs servicing 4. Service filter
5. Transducer pressure regulator adjusted improperly 5. Adjust pressure regulator
6. Transducer pressure modulator adjusted improperly 6. Adjust pressure modulator
Transducer output pres-
sure is greater than 3.0
psig with no input signal
1. Transducer pressure modulator adjusted improperly 1. Adjust Transducer pressure modulator
2. Transducer pressure regulator adjusted improperly 2. Adjust pressure regulator
3. Pressure gauge is faulty 3. Replace gauge
Low pressure output with
a signal above minimum
input signal
1. Zero and span out of calibration 1. Recalibrate zero and span settings
2. MPC is enabled (Old style NT 3000 models only) 2. Disable MPC
Transducer output is 2.0
psig ±0.5 psig, regardless
of input signal
1. Input signal not connected properly 1. Connect input signal to circuit board
2. Pressure modulator assembly not connected to circuit board 2. Connect pressure modulator to circuit board
3. Circuit board is defective 3. Replace circuit board
Output will not reach 15.0
psig with maximum input
signal
1. Supply pressure is low or not connected properly 1. Set supply pressure to recommended value
2. Zero and span out of calibration 2. Recalibrate zero and span settings
3. Pressure gauge is faulty 3. Replace gauge
4. Orifice is plugged 4. Replace orifice
5. Transducer filter needs servicing 5. Service filter
6. Transducer pressure regulator adjusted improperly 6. Adjust pressure regulator
7. Transducer pressure modulator adjusted improperly 7. Adjust pressure modulator
Excessive air consumption
1. Air leakage from input port
1. Tighten port mounting screws. Be certain correct
O-rings are in place.
2. Air leakage from filter cover 2. Service filter
3. Air leakage from pressure gauge
3. Remove gauge, clean threads, apply hydraulic
sealant to threads and replace
4. Air leakage from orifice 4. Replace orifice
Erratic operation
1. Circuit board leads are loose 1. Tighten circuit board leads
2. Orifice is plugged 2. Replace orifice
3. Pressure modulator adjusted improperly 3. Adjust pressure modulator
4. Circuit board is defective 4. Replace circuit board