Operation

3.0Scope

Important information on the Comet 40-150kVA systems’ operation procedure sequences; for normal, on battery, and bypass operation, with descriptions of the control and display indicators.

3.1Power Flow

3.1.1Power Flow, For Normal Operation

During normal operation the AC input source supplies the Rectifier, which converts the incoming AC power to DC. The rectifier in turn supplies the Inverter, which converts DC power to AC to supply the attached load (see Figure 3-1).

Figure 3-1: Power Flow, For Normal Operation.

BYPASS

INPUT

(OPTIONAL)

MAIN

INPUT

STATIC SWITCH

RECTIFIERINVERTER

TO LOAD

BATTERY

3.1.2Power Flow, For On Battery Operation

When AC input power fails, the UPS goes to on-battery operation. DC power is supplied from the UPS battery system to the inverter, which converts battery power (DC) to AC power to supply the attached load (see Figure 3-2).

Figure 3-2: Power Flow, For On Battery Operation.

STATIC SWITCH

BYPASS

INPUT

(OPTIONAL)

RECTIFIERINVERTER

MAIN

INPUT

TO LOAD

BATTERY

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Operation

3 —1

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MGE UPS Systems 40-150kVA user manual Power Flow, For Normal Operation, Power Flow, For On Battery Operation