Motor Monitoring
The Motor screen provides comprehensive monitoring of the ESP motor's operating condition. Access it from the Motor tab in the navigation sidebar.
[Screenshot: Motor monitoring screen - full view]
Motor Load Gauge
The primary indicator on the Motor screen is the Motor Load Gauge, which displays the current motor load as a percentage (0--100%). This is calculated from the ratio of actual current draw to the motor's rated current.
| Load Range | Indication |
|---|---|
| 0--50% | Light load |
| 50--80% | Normal operating range |
| 80--100% | Heavy load |
| >100% | Overload condition |
[Screenshot: Motor load gauge]
Motor Performance Curves
The Motor screen displays four performance curves plotted against the motor's load factor (0--100%):
1. Efficiency vs. Load
Shows how efficiently the motor converts electrical energy to mechanical energy at different load levels. Motors are typically most efficient at 75--100% load.
2. Amperage vs. Load
Shows the relationship between motor current and load. Current increases non-linearly with load -- even at no load, the motor draws magnetizing current.
3. Power Factor vs. Load
Shows how the power factor varies with load. Power factor improves as load increases, reaching its best value near full load.
4. RPM vs. Load
Shows the motor speed at different loads. For induction motors, speed decreases slightly (slip increases) as load increases.
All curves are generated using 5th-order polynomial interpolation (Horner's method) for smooth, accurate representation based on the motor's nameplate data.
[Screenshot: Motor performance curves (efficiency, amperage, PF, RPM)]
Motor Current Sampling
The Motor screen includes a circular/polar plot of the motor current waveform. This visualization helps identify:
- Symmetrical waveform -- Healthy motor
- Asymmetrical pattern -- Possible rotor bar issues, bearing wear, or eccentricity
- Pulsating pattern -- Mechanical load variations
[Screenshot: Motor current circular/polar sampling plot]
Monitored Motor Parameters
The following parameters are continuously monitored and can trigger events:
| Parameter | Description | Default Warn | Default Trip |
|---|---|---|---|
| Overcurrent | Current exceeds rated value | 110% | 120% |
| Undercurrent | Current drops below minimum | 10% | 5% |
| Voltage Unbalance | Phase voltage imbalance | 2% | 5% |
| Current Unbalance | Phase current imbalance | 3% | 7% |
| Under Voltage | Voltage below rated | 10% | 15% |
| Over Voltage | Voltage above rated | 105% | 110% |
| Motor Temperature | Winding temperature | 80 C | 95 C |
| Locked Rotor | Rotor not turning (high current, no speed) | 15% | 25% |
| Excessive Vibration | Vibration exceeds limits | 12% | 20% |
| Voltage THD | Voltage harmonic distortion | 5% | 8% |
| Current THD | Current harmonic distortion | 8% | 12% |
| Ground Fault | Leakage current to ground | 5% | 10% |
| Negative Sequence | Negative sequence current | 10% | 15% |
See Event Settings to customize these thresholds.