1. Noise (electricallinenoise) refers to radio frequency * (RFI) and electromagnetic * (EFI) and other high frequency *, motor operation, relay action, motor controller work, broadcast emissions, microwave radiation, and electrical storms, etc., will cause noise.
2. Frequency drift (frequencyvariation) refers to the change of the frequency of the mains more than 3Hz, which is mainly due to the unstable operation of the emergency generator or the power supply with unstable frequency.
3. Brownout refers to the effective value of the mains voltage is lower than the rated value and lasts for a long time. The causes include: large equipment startup and application, main power line switching, starting large motors, line overload, etc.
4. Mains interruption (powerfai1) refers to the situation in which the mains is interrupted and lasts for at least two cycles to several hours. The causes include: tripping of circuit breakers on the line, interruption of mains supply, grid failure, etc.
5. SNMP is the English abbreviation of Simple Network Management Protocol (Simple Network Management Protocol). Its meaning is to allow computers and peripheral devices to be directly connected to the network without going through the computer, and to be managed by the network system. High-end UPS usually has an optional SNMP network management interface, which allows the UPS to easily connect to the network.
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