MGE UPS Systems 40-150kVA user manual Major Components

Installation and User Manual

1.2Major Components

The following is a description of the cabinets and major components. Refer to Figures 1-5 to 1-8.

UPS Cabinet	Converts the input AC power to direct current and charges the battery. DC power
	is converted back to clean AC power by the inverter for the critical load. Section
	3 describes the operation in detail.
Auxiliary Cabinet	Performs the voltage conversion for the input AC and/or bypass AC using step-
	up and/or step-down transformers.
Battery Cabinet	The battery cabinet stores energy for use by the Inverter. The stored energy is
	utilized in the event that the AC input power from the utility source fails, or falls
	outside of acceptable tolerances. The internal Battery Charger maintains the
	charge of the battery system. The DC output voltage of the charger is tempera-
	ture regulated to ensure an optimal charge voltage. If a customer supplied battery
	system is to be used, an external battery charger may be necessary.
	The standard battery system is housed in a separate enclosure. For systems where
	additional back-up time is required, up to two (2) additional battery cabinets are
	available.
	A standard battery cabinet is available in an adjacent configuration or a stand-
	alone configuration. Adjacent battery cabinets are attached to the right side of the
	UPS using c-brackets provided with the cabinet. Stand-alone battery cabinets
	are remote from the UPS. Refer to the battery cabinet installation drawing for
	more details. An external battery system can also be supplied by the customer.
Rectifier	Converts the AC input voltage from the utility source into a DC voltage, supplying
	the Inverter.
Inverter	Converts the DC voltage supplied from either the Rectifier or the battery system into
	a three-phase AC voltage. An AC output filter is used to achieve a computer-grade
	sinewave output voltage waveform, with a total harmonic distortion of less than 2%
	under linear-load conditions.
Static Switch	Transfers the load between the Inverter output and the bypass AC source without
	interrupting the supply of power to the load, allowing the load to continue
	operation in the event of a UPS fault. The Static Switch circuit assures that
	voltage from the UPS output cannot be fed back to the utility input lines.
Battery System	Stores energy for use by the Inverter. The stored energy is utilized in the event
	that the AC input power from the utility source fails, or falls outside of acceptable
	tolerances. The internal Battery Charger maintains the charge of the battery
	system. The DC output voltage of the charger is temperature regulated to ensure
	an optimal charge voltage. If a customer supplied battery system is to be used,
	an external battery charger may be necessary.

86-160310-00 E00 System Description and Specifications 1 — 3