Applicable Systems
i-Navis
Symptoms
Hitachi-LG i-Navis elevator controller reports fault indicating control system or communication issue requiring diagnostic evaluation of the elevator control system.
Possible Causes
- Group control communication timeout between i-Navis controller and dispatching system
- Door motor thermal protection signal indicating door motor overheating
- Car weight sensor calibration error causing incorrect load compensation
- Emergency power transfer switch detected during normal operation
Troubleshooting Steps
- Step 1: Access i-Navis controller diagnostic via maintenance panel
Fault code with communication status displayed - Step 2: Check group control communication cable at controller terminal
Communication cable connected firmly, status LEDs active - Step 3: Verify door motor temperature with infrared thermometer
Motor surface temperature below 65 degrees C during normal operation - Step 4: Run weight sensor calibration procedure from maintenance menu
Calibration completes with zero and span values within range
How to Reset
Reset by: 1) Correct the fault condition. 2) Reset controller from maintenance mode. 3) Run test trip. 4) Verify normal operation.
Common Replacement Parts
- HLG-CTL-001: Hitachi-LG i-Navis controller board (Verify model and software version)
Frequently Asked Questions
- Q: What is the purpose of the car weight sensor?
The car weight sensor provides load information to the controller for motor torque compensation during start and stop. This ensures smooth acceleration and deceleration regardless of passenger load, and enables empty car return and parking floor selection in group control operation.
Source: Hitachi-LG i-Navis Technical Manual
Category: Elevator