UPS Battery Wet Cell System
Preventive Maintenance – Scope of Work
Minor PM
Visual inspection:
- Cell electrolyte levels
- Connection terminals
- Inter-cell connectors
- Cables
- Hardware cell elements
- Cell covers
- Containers
- Post seals
- Gravity tubes
- Safety vents
- Flash arrestors
- Battery racks
Measure, check, record and adjust as necessary:
- Total battery float voltage
- Positive to ground voltage
- Negative to ground voltage
- Float voltage on each cell
- Total battery ripple voltage and current
Clean and neutralize all cell surfaces, and add distilled water to cells to maintain the required electrolyte levels if needed
Check and record room ambient temperature, verify proper operation of ventilation equipment, and room cleanliness
Major PM
– Includes all tasks done during Minor PM visit plus the following:
Measure, check, record, and adjust if necessary:
- Specific gravity and electrolyte temperature each cell
- Each cell to cell terminal, and cable connections using a micro-ohm meter to verify that the connection resistances are within 20% of the average contact resistance
Documentation of inspection with recommendations for any corrective action deemed necessary will be provided on both Minor and Major PMs
