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Int. Mech. Bypass Switch Open. The internal mechanical switchgear is open. No corrective action is necessary. 990-2359A Smart-UPS® VT 10-30kVA, 200/208V and XR Battery Enclosure Operation Guide Operation – Display Messages/Troubleshooting Display Message Meaning Corrective Action Low-Battery. The UPS is in battery operation and the battery charge is low. Note: Runtime is limited in duration. Shut down the system and the load equipment or restore incoming voltage. Load Is No Longer Above Alarm Th