Emergency Standby Diesel Generator No Load Weekly Test
This log documents the weekly operational check of emergency standby diesel generators under no-load conditions. Verifies battery health, cranking, oil pressure, coolant, exhaust, and fuel system performance per NFPA 110 and manufacturer guidelines.
The emergency standby diesel generator must be exercised weekly under no load (or per local code) to verify automatic starting, operating parameters, and fuel system integrity. This test meets NFPA 110 requirements for Level 1 systems. Any deviation from thresholds must be recorded in the defect log and escalated immediately.
- Verify generator main circuit breaker is OPEN and lockout/tagout is removed only after confirming no load is connected. Emergency stop button functional.
- Hearing protection, safety glasses, gloves, and arc‑flash rated clothing near battery terminals.
- Digital multimeter, infrared thermometer, coolant hydrometer, oil dipstick, log sheet, and manufacturer manual.
Inspection / Log Matrix
| Status (P/F) | Inspection Item / Task | Tolerance / Threshold | Actual Reading |
|---|---|---|---|
| [ ] Pass [ ] Fail | Battery voltage (pre-start) | 24.0 – 27.0 VDC (12V system: 12.4–12.8) | _________________ |
| [ ] Pass [ ] Fail | Coolant level (reservoir) | Between MIN and MAX marks | _________________ |
| [ ] Pass [ ] Fail | Oil level (dipstick) | In crosshatch area, not below ADD | _________________ |
| [ ] Pass [ ] Fail | Fuel level (day tank) | ≥ 75% full | _________________ |
| [ ] Pass [ ] Fail | Coolant heater operation | Temp 35–50°C (if equipped) | _________________ |
| [ ] Pass [ ] Fail | Cranking time (start attempt) | Engine starts within 10 seconds | _________________ |
| [ ] Pass [ ] Fail | Oil pressure at idle (after start) | Min 30 psi (or per manufacturer spec) | _________________ |
| [ ] Pass [ ] Fail | Frequency (steady-state no load) | 60.0 ± 0.5 Hz | _________________ |
| [ ] Pass [ ] Fail | AC output voltage (L-L) | 480V ± 5% (or system voltage) | _________________ |
| [ ] Pass [ ] Fail | Exhaust manifold temp (each bank) | < 600°C (equal within 50°C across banks) | _________________ |
| [ ] Pass [ ] Fail | Coolant temperature after warm-up | 70–90°C (normal range) | _________________ |
| [ ] Pass [ ] Fail | Fuel system pressure (if gauge) | 30–50 psi (or per manual) | _________________ |
| [ ] Pass [ ] Fail | Coolant level after shutdown | No loss; within marks | _________________ |
| [ ] Pass [ ] Fail | Oil level after shutdown | No loss; within crosshatch | _________________ |
| [ ] Pass [ ] Fail | Emergency stop test (engine stops within 5 sec) | Immediate shutdown | _________________ |
Defect / Corrective Action Log
| Date / Time | Item # | Issue Identified | Corrective Action Taken | WO # |
|---|---|---|---|---|
| ___/___/_____ | _______ | _______________________________ | _______________________________ | _______ |
| ___/___/_____ | _______ | _______________________________ | _______________________________ | _______ |
| ___/___/_____ | _______ | _______________________________ | _______________________________ | _______ |
By signing below, the inspector verifies that all items have been checked according to the manufacturer’s specifications and NFPA 110/CSA 282 safety standards. All failures have been entered in the defect log.