Digital Power Amplifier
Series VRD350 and VRD355Installation Manual
3
IA VRD UK.INDD RH 02.06
Parker Hannifin GmbH & Co. KG
Hydraulic Controls Division
1. Description and Design 4
1.1. Technical Data 5
1.2. Ordering Code 6
1.3. Connection 7
1.4. Block Diagrams 9
2. Commissioning 12
2.1. Front Panels 12
2.2. Programming 13
2.3. Signal Diagrams 15
2.4. Diagnosis 20
2.5. Parameters 20
3. Function 24
3.1. Command signals 24
3.2. Ramp Function Generators 24
3.3. Offset 25
3.4. Valve Curve Linearisation 25
3.5. Adjustment of Current Gain 25
3.6. Dither 25
3.7. Current Controller 25
3.8. Output Stages 25
3.9. Step Functions 26
3.10. Control Circuits 26
3.11. Zero Point Adjustment 26
3.12. Controller Parameter 27
3.13. Programmable Comparator Function 31
3.14. Serial Interface 32
3.15. ABG35S 32
4. Operating and Error Messages 33
4.1. Enable 33
4.2. Reset Ramp 33
4.3. Malfunction and Error Messages 33
4.4. Comparator Output 34
4.5. Externally selected command signals and directions 34
5. Wiring Diagram of Rear Connector 34
6. Parameter List 35
7. Wiring Diagrams 37
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