Wartsila ESM-10 Engine Safety Module Rev 6

Wartsila ESM-10 Engine Safety Module Rev 6

The Wärtsilä ESM-10 Engine Safety Module Revision 6 (manufactured in coordination with Dr. E. Horn GmbH) is a critical, high-reliability solid-state marine engine protection system. Engineered specifically for heavy-duty marine propulsion and auxiliary generator sets (such as the Wärtsilä 38 series), the ESM-10 acts as the ultimate line of defense against catastrophic engine failures. It continuously monitors critical parameters—including overspeed, low lubricating oil pressure, and high high-temperature (HT) cooling water levels—executing rapid, autonomous hardwired shutdowns via emergency stop solenoids when operating limits are breached. Revision 6 features updated solid-state board layouts for optimized vibration dampening, integrated wire-break detection loops, and distinct isolated 4-20mA current outputs designed for seamless integration into local engine instrumentation.

Model Details

• Brand: Wärtsilä
• Model: ESM-10 Engine Safety Module
• Revision: Rev. 6
• Manufacturer Spec Code: EV303123A
• Analog Configuration: 4-20mA (D=1.14 / F=1.13)
• OEM Partner: Dr. E. Horn GmbH / Hornell

Specifications: Wartsila ESM-10 Rev 6

Main Features

1. Dual Redundant 24VDC Power Inputs: Isolated primary and backup supply logic spread over physical internal fuses ensures safety function during partial electrical failures.
2. First-Out Alarm & Shutdown Lockout – Stores the actual primary reason for a trip in memory and prevents downstream fault cascade from hiding the true root cause.
3. Active Wire-Break Monitoring: All crucial shutdown digital inputs (via parallel 10kΩ resistors) and solenoid outputs are continuously monitored in both ON and OFF states.
4. Triple-Element Internal Fuse Protection: Separate internal conventional 2AT micro-fuses isolate module power, backup vital logic and analog loops.
5. Isolated Instrument Outputs Features numerous galvanic isolated 4-20mA loops that can drive high impedance display indications up to 750Ω.

Applications

• Main propulsion engine automation systems for ocean-going container vessels and tankers.
• Auxiliary diesel generator set emergency trip units (e.g., Wärtsilä 20, Wärtsilä 32, and Wärtsilä 38 platforms).
• High-demand industrial land-based thermal power plant stationary diesel units.
• Offshore marine drilling rig emergency safety shutdown systems (ESD).

Compatibility

• Compatible Engine Models: Wärtsilä 20, Wärtsilä 32, Wärtsilä 38.
• Cross-Reference Part Numbers: Wärtsilä 107.366.780.001, EV303123A, Hornell ESM-10 Rev 6.
• Legacy Succession: The ESM-10 Rev 6 utilizes analog potentiometers and mechanical recessed thumbwheels for parameter configuration, differing from the digitally programmed, CANOpen-driven ESM-20/ESM-21 series modules.

Chief Engineer’s Deployment Insight

Unused Input Terminal Discipline: A common failure mode on retrofits is an immediate “False Trip State.” On the ESM-10 Rev 6, any unused digital inputs must be explicitly terminated to satisfy the internal wire-break detection logic. All unused Normally Open (NO) external shutdown lines must have a 10 kΩ resistor mounted in parallel. All unused Normally Closed (NC) inputs must be closed out with a direct short-circuit jumper. Furthermore, if a stop solenoid channel is vacant, terminate it using a 470 Ω / 5 Watt power resistor to completely bypass false open-loop solenoid break alarms.