Mitsubishi 9800A Series Specifications download pdf (Page 4)

j. Automatic UPS restart and load pick-up (after system battery depleted;

AC restored).

k. Programmable external customer contacts (A-Type) dry contacts.

l. Touch screen person-machine interface.

m. Remote and Local Emergency Power Off (EPO).

n. Static Bypass Disconnect.

o. History graph of Kw, UPS events

2.1.6. Optional features:

a. Remote monitor panel.

b. Maintenance Bypass Switch (MBS).

c. Input Isolation Transformer.

d. Wall mounted or free standing DC cable landing cabinet.

2.2. Modes of Operation

The UPS shall be designed to operate continuously at rated capacity as an on-line,

automatic system in the following modes:

2.2.1. Normal - The inverter continuously supplies AC power to the critical load. The

rectifier converts commercial AC power to regulated DC power which then

serves as the inverter input and, simultaneously, as a float charge input to the

storage battery.

2.2.2. Emergency - In the event of a commercial AC power failure, the inverter shall

derive its input from the system battery, thus providing uninterrupted power to

the critical load. This transition shall be accomplished without any switching or

coupling, and with no interruption of power to the critical load from either a

failure or restoration of the commercial AC power.

2.2.3. Recharge - Subsequent to restoration of commercial AC power, the rectifier

shall automatically reactivate and provide DC power to the inverter,

simultaneously recharging the system battery. This occurs automatically and

without interruption to the critical load.

2.2.4. Bypass - In the event that the UPS must be taken off line due to an overload

condition or UPS failure, the critical load shall be transferred to the bypass

source via the static switch without interruption of power to the critical load. A

paralleling, wrap-around contractor shall be used to maintain the bypass source.

The static switch shall only be utilized for automatic emergency transfers. A re-

transfer from bypass to inverter shall be performed automatically in overload

conditions. A re-transfer shall be inhibited if satisfactory synchronization of the

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Mitsubishi 9800A Series Specifications Page 4