Specifications

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4
Power Supplies
UPS classication
UPS classication
Usable UPS class
Power disturbance
Power failure
>10ms
Voltage
uctuations
<16 ms
Peaks
4-16ms
Under-voltage Over-voltage Lightning
effects
Surge
<4ms
VFI
VI
VFD
VI: UPS output voltage is independent of line voltage
or comparable modications (voltage-stabilized)
Previously used denitions: line-interactive,
single-conversion, delta conversion
Units: MT, MT-RM, ME, MI-RM
VFD: UPS output frequency and output voltage
is dependent on line frequency and line voltage
or comparable modications
Previous used denition: off-line, stand-by
Two differenr technologies are used to provide a
consumer with uninterrupted power. The norms
EN 50091-3 and IEC 62040-3 serve to differentiate the
two technologies and assess their protection.
VFI: UPS output voltage and frequency are
independent of line voltage and frequency or
comparable modications.
Previously used denitions: online double-conversion,
continuous operation
Units: MH, MH-RM, MHD, MHD-RM, MKD, MKD-RM,
Pegasus, Zephyr, Quasar