ABB 6310408P-1 Panduan Produk - Halaman 7

Jelajahi secara online atau unduh pdf Panduan Produk untuk Peralatan Industri ABB 6310408P-1. ABB 6310408P-1 17 halaman. Maintenance bypass panel for 827e inverter plant

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1: Theory of Operation

The maintenance bypass panel (MBS) is designed to be used with the ABB POWER 827E inverter

plant. The main purpose of the MBS is to allow an AC load to be switched from its primary source

(Inverters) to an alternate source (commercial AC) and back to the primary source (Inverters) again.

This may be required, for example, when doing maintenance or upgrades to the Inverter Plant. The

transfer is done with a front panel mounted switch. The Inverter source and AC Line source are not

phase locked and the transfer is asynchronous, i.e., it occurs at random phase. For more information,

refer to schematic 4391036SD and 4391036SD-1 attached to the rear of this document.

A manual front panel "BYPASS" switch is used to select the load source. The "INVENTER." mode

selects the Inverter source and is the normal state. The unit is said to be in "BYPASS" mode when the

"UTILITY" (commercial AC) source is selected. There are front panel LEDs to indicate if the

"INVERTER" and "commercial AC" voltages are present, and to indicate if the unit is in BYPASS mode.

While the INVENTER and AC LEDs indicate the presence of those source voltages, they do not prevent

the load transfer from occurring. It is the operator's responsibility to know if the source that is being

transferred to is an energized source.

An alternate purpose of the MBS is to collect alarms from the inverter shelves and to extend these

alarms to the plant monitor. The status of the consolidated alarms is indicated by the upper three

LEDs on the front panel. Any Major alarm will light the Major LED and extend a form C transfer to the

plant monitor via a terminal block on the rear panel (see system schematic for details). A single Minor

alarm extend a minor alarm, however, two or more Minor alarms will generate a Major alarm and

retire (turn off) the Minor alarm. A Capacity alarm is an indication that an inverter shelf has exceeded

its programmed and/or equipped capacity. This alarm may be used as a prompt to add more inverter

capacity (i.e. shelves and modules). The load sharing capabilities of the 827E inverters will typically

cause multiple shelves to provide a Capacity Alarm at the same time, if configured and equipped

similarly. The Minor and Capacity alarms are extended to the plant monitor as form C transfers.

NOTE: The MBS is powered by a -48VDC battery input at the rear. If this input is not present, there

will be no LEDs lit on the front panel.

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827E MBS_MAN

Rev. 2.4