UPS WITH ALARMS OF RECTIFIER NOT WORKING, INCORRECT DC VOLTAGE AND INACTIVE PFC

[MARIANOSB1]

Hello Schneider team and community,

We are operating a Schneider Easy UPS 3M, 160 kVA / 160 kW, installed in a hospital environment powering critical loads. The UPS is intermittently displaying the following alarms simultaneously:

• E:05 – Rectifier not working

• E:10 – DC Bus voltage incorrect

• PFC inactive

When these alarms appear, the unit automatically transfers to bypass. After a few seconds, it recovers on its own and switches back to normal double-conversion operation.

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🔧 Current firmware version: 3.2.1.1
📦 Model: Easy UPS 3M 160 kVA (Advanced version with hot-swappable power modules)
📍 Location: Hospital – critical loads

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A Schneider Electric expert advised the following:

“This UPS contains a power module in which the charger, PFC, and rectifier components are integrated into a single board. When the system detects incorrect DC bus voltage along with a rectifier fault and PFC inactive status, it points to a likely failure within that module. According to our field documentation, the recommended solution is to replace the full power module.”

They also recommended updating the UPS firmware as part of the corrective action.