If the inverter starts, the system will automatically synchronize and transfer back to "Normal" operation. B. Switching the UPS from Bypass to Normal Operation If the system is stuck in manual maintenance bypass: Ensure the is ON and running. Verify the Output Voltage is stable and in phase.
Ensure the "Bypass Available" LED is green. The inverter must be synchronized with the bypass source before transferring.
Indicates an issue with incoming utility power, input fuses, or the thyristor/SCR bridges. liebert hipulse d ups manual fix
Indicates a mains failure, phase reversal, single phasing, or rectifier over-voltage/temperature.
, please provide the or LCD message you are seeing. If you can also tell me the model year or kVA rating , I can help you find the specific procedure or parts you need. Share public link If the inverter starts, the system will automatically
To minimize the need for emergency manual fixes, execute these checks semi-annually:
If the alarm persists with no load attached, the internal inverter circuit is likely damaged. You must manually transfer the UPS to internal static bypass (see section below) to keep your load powered while waiting for a service technician. Battery Charger / DC Bus Fault Verify the Output Voltage is stable and in phase
Turn off the external battery cabinet circuit breaker. The internal components are now isolated, while your critical load runs directly on unconditioned utility power. Preventive Maintenance Checklist
The inverter has shut down, leaving the load on maintenance or static bypass.
The UPS trips with a high or low DC bus alarm, immediately shutting down the inverter to protect internal components.
On the control panel, navigate to the menu and select Transfer to Inverter .