Woodward CPC-II electro-hydraulic current pressure converter

Summary of Performance of CPC-II

Based on the original data, the performance improvement of CPC-II compared to traditional I/H systems can be summarized into four points:

Quiet and stable output, significantly reducing servo system wear and tear;

The dynamic response is fast without damping, and the step response is close to ideal;

The disturbance free control capability covers the disturbance conditions of the unit, reducing overshoot/underregulation;

Stable pressure output brings fast and accurate command tracking.

For power plants with throttle valve control accuracy and unit availability as the core assessment indicators, these indicators directly correspond to economic benefits.

Upgrade replacement path and model comparison

4.1 Upgrading from CPC: Real Direct Replacement

CPC-II is a direct replacement for CPC: the external dimensions of the installation base and the manifold of the oil circuit interface remain unchanged, without the need to modify the basic installation surface and pipelines. The precise installation dimensions can refer to Woodward product specification 03352.

4.2 Upgrading from Voith E360 I/H: Adaptation Kit Solution

For users of the original Voith E360 I/H throttle control unit, Woodward offers a separately sold Adapter Kit with order number 8928-7240. The installation of the Voith converter to CPC-II can be completed through this kit.

4.3 Comparison Table of Explosion proof Areas and New and Old Models

When selecting, it is necessary to check the classification of hazardous areas on site. The comparison table is as follows:

The original CPC model area classification control pressure range has been upgraded to CPC-II model

8901-456 / 8901-457 / 8901-459 / 8907-1102 / 8907-1106 Class I, Division 2 / ATEX Zone 2 0~10bar（ Corresponding to 8901 series/0~25bar (corresponding to 8907 series) 9907-1200

9907-046 / 9907-477 Class I, Division 1 0~10bar / 0~25bar 9907-1199

9907-802 / 9907-803 / 9907-1100 / 9907-1103 Class I, Division 2 / ATEX Zone 1 & Zone 2 0~10bar（9907-802、9907-803）/ 0~25bar（9907-1100、9907-1103） 9907-1197

Summary of selection points:

Zone 2/Division 2 applications: corresponding to CPC-II models 9907-1200 (0~10 bar) or 9907-1197 (0~25 bar);

Division 1 application: Corresponding to CPC-II models 9907-1199 (covering 0~10 bar or 0~25 bar);

Pressure level selection: It is necessary to match the corresponding new model with the rated control pressure range (0~10 bar or 0~25 bar) of the original CPC, and cannot be substituted across pressure levels.

Implementation suggestions for upgrading projects

Current situation inventory: Verify the specific ordering model (nameplate information) of the CPC in service on site and the classification of the explosion-proof area on site, and determine the replacement model according to the table above; If it is Voith E360 I/H, include the adapter kit 8928-7240 in the procurement list;

System side confirmation: If the unit regulation system has adopted or plans to adopt a redundant pressure set point/sensor scheme, its redundant input management capability can be activated when upgrading to CPC-II to improve channel reliability;

Adjustment of oil quality management strategy: After the CPC-II is put into operation and verified to be stable, the maintenance cycle of the front-end filter can be evaluated for cancellation or extension, and the operating procedures and checklist can be updated synchronously;

Debugging tool preparation: Use Woodward's PC based service tool for parameter configuration, manual stroke testing, and performance trend recording, establish baseline data for subsequent state monitoring;

Normalization of health monitoring: Utilize the internal health monitoring function of CPC-II, incorporate the converter into the predictive maintenance system, and avoid relying on regular disassembly and inspection.