Description
Product Overview
The Autronica KR-13A-Y7H is a specialized marine safety unit designed to fulfill classification society requirements (DNV, ABS, LR, ClassNK) for Periodically Unattended Machinery Spaces (UMS). Installed within the Engine Control Room (ECR) or main engine monitoring switchboards, its primary purpose is watchkeeper safety (the “Dead Man Alarm”).
When an engineer enters the machinery space, the KR-13A countdown timer initiates. The engineer must periodically press reset pushbuttons located throughout the engine room before the pre-warning period elapses. If the timer runs out without a reset signal, the KR-13A-Y7H triggers a local pre-warning buzzer, followed by general engine room sirens and duty engineer cabin alarm extensions if unacknowledged.
The suffix revision -Y7H denotes a specific internal hardware configuration regarding supply voltage tolerance, timing range potentiometers, and relay contact logic tailored for integration into broader Autronica engine monitoring and alarm systems.
Technical Specifications
| Parameter | Specification |
| Manufacturer | Autronica / Kongsberg Maritime |
| Model / Part Number | KR-13A-Y7H (Variant of KR-13A series) |
| Primary Function | Dead Man / Personnel Watchkeeping Safety Alarm |
| Power Supply | 24 VDC Nominal (18–32 VDC range) |
| Input Channels | Multiple parallel dry-contact inputs for local reset pushbuttons |
| Timing Adjustments | Independent pots for Pre-Warning (e.g., 15–30 min) and Main Alarm delay |
| Output Contacts | Voltage-free relay contacts for local sirens, rotating lights, and cabin extensions |
| Mounting Style | DIN-rail / Bulkhead chassis with front-facing screw terminal strip |
| Status Indication | Front-panel LEDs for Power, Pre-warning Active, and Alarm Triggered |
| Operating Temp | -15°C to +70°C (Engine room ambient standard) |
Application Scenarios & Marine Field Experience
The Engine Room Emergency Scenario
During a night watch in Unattended Machinery Space (UMS) mode, an engineer descends into the lower engine room to investigate a purifier fault. If the engineer slips or becomes incapacitated, the Autronica KR-13A-Y7H acts as the ultimate safeguard. If the pre-set interval (typically 15 to 27 minutes) passes without any reset button actuation:
- Stage 1 (Pre-Warning): A localized audible buzzer and flashing light activate where the engineer is working.
- Stage 2 (Engine Room Alarm): If unacknowledged within 2–3 minutes, the unit trips general engine room horns.
- Stage 3 (General Vessel Alarm): After a final delay, it escalates to the Duty Engineer’s cabin and the Navigation Bridge, alerting the bridge team that an engineer in the machinery space requires immediate assistance.
Key Applications
- UMS Machinery Spaces: Primary personnel safety timer under SOLAS and Class rules.
- Autronica System Maintenance: Direct drop-in replacement for failed KR-13A series modules in aging vessel automation panels.
- Auxiliary Watch Monitoring: Standalone safety timing loop for localized hazardous workspaces aboard ships and offshore platforms.
KR-13A-Y7H
Veteran Troubleshooting & Installation Tips
⚠️ Verify the Sub-Model Suffix (-Y7H)
While standard KR-13A units share similar terminal pinouts, suffix variations like Y7H can feature specific timing scale caps or inverted relay logic (normally open vs. normally closed) for safety fail-safe loops. Always check terminal continuity against your vessel’s electrical drawings prior to commissioning a replacement unit.
❗ Trace Parallel Reset Loop Wiring First
If the KR-13A-Y7H triggers alarms prematurely or fails to reset, inspect the field reset pushbuttons distributed across the engine room. Salt spray, oil mist, or moisture in a single remote pushbutton box can short the reset line, keeping the timer held in reset or preventing normal cycle initiation.
⚠️ Check Terminal Strip Tightness and Contact Oxidation
Because the KR-13A-Y7H utilizes a long multi-terminal block (terminals 1 through 23+), continuous engine vibration over years of service can loosen screw terminals. When swapping modules, inspect female terminal blocks for corrosion, spray contact cleaner, and torque screws appropriately.
Frequently Asked Questions (FAQ)
Q: Is the KR-13A-Y7H still in active production by Autronica?
A: No, the KR-13A series is a legacy component. New units are generally no longer manufactured by the OEM, making tested surplus or reconditioned marine stock the standard solution for direct vessel repairs without requiring panel re-engineering.
Q: Can I replace a standard KR-13A card with a KR-13A-Y7H?
A: In most cases, yes, as they share the same physical form factor and terminal architecture. However, you must verify the specific timer adjustment ranges and relay output configuration required by your vessel’s class design.
Q: How do I test the functionality of a KR-13A-Y7H unit on the bench?
A: Supply 24 VDC to the primary power terminals, set both timing potentiometers to their minimum settings, and allow the unit to run through its cycle. Verify that triggering a momentary bridge across the reset terminals resets the internal timer, and confirm that relay contacts switch state when pre-warning and main alarm thresholds are reached.
Q: Does the module come tested with warranty?
A: Reconditioned and surplus marine modules are typically fully bench-tested under simulated 24V marine loads and backed by a 12-month supply warranty.
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