If you are using Load Bus Synchronization (LBS), ensure the "LBS Active" or "LBS Enabled" LEDs are consistent with system requirements. 3. Procedures for Manual Fix (Operation Procedures) A. Resetting the UPS After a Fault
Open the cabinet door protecting the manual switches. Move the Maintenance Bypass Breaker (QS3/MBB) to the ON / CLOSED position.
The manual isn’t just for installation. It’s your surgical guide for ghost alarms. Trust its troubleshooting flow, not internet shortcuts.
Download the official Vertiv Liebert Hipulse D 50-500 kVA User Manual (Part Number: 30103873STD) and cross-reference the fault codes above with Section 7.2. For persistent E26 or E34 faults, the hardware fixes provided here are your fastest path to uptime. liebert hipulse d ups manual fix
Reduce the connected load immediately. The UPS may transfer to bypass if the overload continues.
Ensure the room temperature stays between 20°C–25°C (68°F–77°F). Visual Battery Scan Look for casing swelling, cracks, or terminal leaks. Annually Infrared Scanning
The Liebert Hipulse D is a legacy three-phase Uninterruptible Power Supply (UPS) known for its robustness in critical power environments. However, as these units age, they often require specific manual interventions to maintain operational integrity. This write-up outlines the diagnostic and rectification procedures for the most common "fixes" required by service engineers, focusing on capacitor degradation, fan failure, and inverter lockouts. If you are using Load Bus Synchronization (LBS),
To avoid re-reading 240 pages every time, extract these tables from your downloaded manual:
Real-time load demand exceeds the UPS kVA/kW rating, output short-circuits, or high inrush current from downstream equipment.
Inspect the rectifier control board for visible signs of burn marks or swollen capacitors. Clear any dust accumulation using low-pressure dry compressed air. Resetting the UPS After a Fault Open the
Select . Ensure the "Load on Bypass" LED lights up green. Step 2: Engage Maintenance Bypass Switch
Blown AC input fuses, a failed SCR (Silicon Controlled Rectifier) module, or a malfunction on the rectifier control board.
by turning the manual bypass switch (SW1) to the bypass position, which powers the load directly from the source without UPS protection. Safety Precautions High Voltage:
Safely isolate the fan power circuit and check the dedicated fan fuses.