Power Safe Mode Controller
Power System Emergency Safe Mode and Recovery System
The Power Safe Mode Controller is a hardware-enforced safety system composed of radiation-hardened logic circuits, fail-safe relays, and hardware comparators that maintains power to critical survival loads during catastrophic generation failures. Utilizing a redundant two-of-three voting architecture, it implements a hardware latch that cannot be overridden by software faults. On the Moon, an unmitigated outage causes the irreversible loss of stored cryogenic samples. To prevent cascading system collapse, the controller sheds non-critical demand, allocating remaining bus power strictly to cryogenic cooling, command and data handling, and communications, before initiating an autonomous, verified recovery sequence once nominal operating conditions return.
Hardware-enforced safe mode ensuring minimum critical loads maintained during power emergencies
Purpose
Guarantee power to preservation systems (cryogenics) even during catastrophic power system failures
Context
Child of L2-PWR-MGMT within the Lunar Ark power generation system
Principles
- ▸Hardware-latched safe mode cannot be overridden by software faults
- ▸Minimum power bus supplies only cryo, CDH, and essential systems in safe mode
- ▸Automatic recovery sequence attempts to restore normal power after safe mode trigger clears
- ▸Redundant safe mode controllers (2-of-3 voting) prevent false triggering
Typical implementations
- ▸ISS Contingency Power System emergency power allocation
- ▸Spacecraft safe mode heritage design (bus voltage threshold triggers)
- ▸Nuclear reactor SCRAM systems (fail-safe design philosophy)
- ▸Submarine emergency power switching systems
Lunar considerations
- ▸Cryogenic systems must NEVER lose power or samples are irreversibly lost
- ▸Safe mode must prioritize: 1) Cryo cooling, 2) CDH, 3) Comm, 4) Everything else OFF
- ▸Recovery from safe mode must be autonomous and verified before restoring full power
- ▸Must handle multiple sequential failures gracefully without cascading to total loss
Specifications
Functional
| primary function | Hardware-enforced safe mode ensuring minimum critical loads maintained during power emergencies |
Physical
| materials | Rad-hard logic ICs, Fail-safe relays, Hardware comparators, Independent power sense |
Interfaces
Provides
- Emergency power bus allocation in safe mode
- Guaranteed minimum power for cryocoolers in any failure mode
Requires
- Power system fault indicators triggering safe mode
Cite this entry
Lunar Ark Codex. "Power Safe Mode Controller" (L3-PWR-MGMT-SAFE). Retrieved 10 September 2026, from https://lunarark.com/entry/L3-PWR-MGMT-SAFE
Licensed CC-BY-SA 4.0. You may reuse and adapt this entry with attribution, under the same licence.