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15. TROUBLE SHOOTING
If the PEM4 + SPU3 system does malfunction, power down the PEM4 + SPU3 system, check all wiring
and power up the PEM4 + SPU3 system back again. This will restart the program.
No torque signal
The connection between the SPU3 and the stator control box is broken
• Check wires for damage.
• Check the connections in the SPU3 or in the stator control box if applicable.
No signal from shaft generator
The connection between the SPU3 and the shaft generator sensor is broken.
• Check the wires for damage
• Check the connections to the backplane in the SPU3 (see section 17 Drawings)
Temperature sensor failure
The connection between the SPU3 and the temperature sensor is broken.
• Check the wires for damage
• Check all connections inside the temperature sensor.
• Check the connections to the backplane in the SPU3 (see section 17 Drawings)
Flowmeter alarms can occur when:
Flow meter 1 (supply) < Flow meter 2 (return)
Flow meter 1 (supply) > 0 and Flow meter 2 (return) = 0
• Check the wires for damage.
• Check all the connections at the flow meter side.
• Check the settings of the flow meters and relevant parameters and adjust them accordingly in
cooperation with a VAF service engineer.
Temperature supply or return is too high
Adjust the temperature high set point of the alarm or adjust the maximum fuel temperature level(s)
accordingly.
16. EMC CLASSIFICATIONS OF THE PEM4 + SPU3 SYSTEM
PEM4 + SPU3 system is tested in accordance with:
• General Vibration Strain, IEC publication 60068-2-6.
• Also complies with EMC and ESD tests according to EN61000.
16.1 CERTIFICATES
For a torque measuring system, no classification certificates are required.
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