Altronic CPU-95 ignition system for Bergen KVG-12

Altronic CPU-95 capacitor discharge ignition system from a Bergen KVG-12 lean burn gas engine.

Rolls-Royce part no. 702580 (display module) and 702583 / 702584 / 702585 (ignition control unit). Ignition coils (one per cylinder), junction box, pickups and harness available.

System data (Altronic CPU-95 installation instructions):

• Power supply 24 V DC (24–28 V), 5 A nominal, with two external 10 A fuses
• Ignition module: engine mounted on shock mounts, maximum ambient temperature 65 °C, within 2.1 m (7 ft) of the primary junction box
• Display module: −40 to 70 °C, 0–95 % humidity non-condensing, within 15 m (50 ft) of the ignition module
• Suitable for Class I, Division 2, Group D hazardous locations (CSA)
• 4–20 mA input for timing control, three alarm outputs, low voltage shutdown input
• Direct replacement for Altronic CPU-90: same mounting footprint, coils, pickups, harness and junction boxes

Altronic's application list (form CPU-95 AL 4-08) specifies for the Bergen (Rolls-Royce) KVGS-12: ignition module 791952-18 (18 outputs, dual capacitor), memory code L4V180.FS534, 12 ignition coils. The exact module fitted to this engine is confirmed from its nameplate on removal.

From a Bergen KVGS-12 G4 lean burn biogas engine, engine no. 20047, built 1995, totally overhauled and upgraded to G4 by Rolls-Royce in 2009 and maintained by Rolls-Royce under service contract since new. The engine is being dismantled for spare parts.