ABB RER620

1MAC309294-MB F Section 9
Other functions
RER620 425
Technical Manual
Figure 221: Uninterruptible Power Supply (UPS) block diagram
9.1.2.1 Input power requirements
The power input circuit includes surge protection that will react to both differential and
common mode noise.
The UPS may be powered by AC or DC. The incoming power supplies a 120 watt
DC-to-DC power supply. There are two versions of the UPS. One version covers a 125
Vdc and 120 Vac range, while the other covers a 250 Vdc and 240 Vac range. There is a
comparator that monitors the incoming power and will switch off the DC-to-DC if the
voltage is not inside a specified tolerance.
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