Inverter Module; Multi-Cabinet Paralleled System - Pacific Power Source MS SERIES Operation Manual

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SECTION 1

1.6.3 INVERTER MODULE

The inverter module is a solid-state device that converts power from the rectifier

circuit to provide the rated AC system output within specified limits.

The output frequency of the inverter is controlled by a digital oscillator.

The oscillator is adjustable over the range of 47 to 500Hz in the variable position.

In the fixed frequency positions, the oscillator is designed to control the inverter

output frequency within ±0.01%. Drift will not exceed ±0.01% during a 24-hour

period. Total frequency deviation, including short time fluctuations and drift, is

typically within ±0.01% from the specified frequency.

The inverter is capable of supporting transient overloads up to 150%, or any

continuous load within its rating, without reducing the output voltage. Loads

greater than 150% may cause a reduction of the output voltage.

The inverter will current limit at 150% of rated current. The inverter is capable of

supplying at least 200% of rated RMS current for short circuit conditions. If the

short circuit is sustained, the inverter will shut down and disconnect automatically

from the output.

Each inverter output phase voltage is independently regulated to ±0.5%, with

AGC enabled, such that unbalanced loading will not cause the output voltage to

exceed the specified voltage unbalance.

An output power filter is incorporated in the inverter unit. The filter reduces the

inverter output sine wave voltage harmonics to 1% RMS total and single

harmonics to 0.5% RMS maximum for linear loads at 50-60Hz.

Power semiconductors in the inverter unit are fused with fast acting fuses, so that

loss of any one power semiconductor will not cause cascading failures.

Up to twelve cabinets may be paralleled together for higher power systems.

Each 3060-MS is capable of operating as either a SLAVE or MASTER in multi-

cabinet parallel operation but only one Master may be active at a time.

Parallel system architecture is such that any failed slave unit automatically drops

off-line.

A failed MASTER turns the entire system off. In this event an operator can select

any other paralleled unit as the MASTER from a front panel control and restore

system operation.

1-6

GENERAL

Document # 126050-10 Rev E

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