Operation
Search
An automated search circuit is available to minimize the power draw when no loads are present. When enabled, the inverter does not always deliver full output. The output is reduced to brief pulses with a delay between them. These pulses are sent down the output lines to see if a resistance is present. In effect, the pulses “search” for a load. If one is detected, the inverter’s output increases to full voltage so that it can power the load. When the load is turned off, the inverter “goes to sleep” and begins searching again.
The sensitivity of Search mode is in increments of approximately 0.1 Aac. The default is 6 increments, or 0.6 Aac. A load which draws this amount or greater will “wake up” the inverter.
NOTE: Due to changing load characteristics, these increments are only approximate and may not function exactly as listed.
The pulse duration and the delay both have a time period that is measured in AC cycles. These two items and the load detection threshold are adjustable.
¾Search mode can save a considerable amount of power, particularly in smaller systems with intermittent use.
¾Search mode may not be useful in larger systems with loads that require continuous power (e.g., clocks, answering machines, fax machines). Search mode may cause nuisance shutdowns, or it may sleep so rarely that there is no benefit.
¾Some devices may not be easily detectable by Search mode.
Input
When the GFX inverter input terminals are connected to a stable AC source, the inverter will synchronize itself with that source and use it as the primary source of AC power. (See “AC Source Acceptance” on page 15.) In this situation, the transfer relay will engage, linking the AC source directly with the inverter’s output. It can also use the source to charge batteries. (See “Transfer” on page 16 and “Battery Charging” on page 18.)
¾Two sets of input criteria are available, one for the utility grid and one for a generator. Only one source can be selected at a time. In the MATE system display, the source is selected using the ac transfer control menu. In the MATE3 system display, it is selected using either the Inverter Input Select or the AC Input and Current Limit menus. See the system display manual for more information. (For other aspects of input selection, see the items below. Also see AC Current Settings on page 15.) Both grid and generator criteria are adjustable.
¾The
¾The Input Support feature can use battery power to assist a smaller AC source. (See the section entitled “Input Support” on page 17.)
¾There are a number of considerations when selecting the type and size of an AC generator. (See the section entitled “Generators” on page 16.)
¾The AC input current is used to power both loads and battery charging. The total should not exceed the size of the AC overcurrent device or AC source. These devices should be sized appropriately during planning.
¾The loads powered by the inverter must not exceed the size of the inverter’s transfer relay. (See the section entitled “Transfer” on page 16.)
CAUTION: Equipment Damage
Current draw in excess of the inverter’s transfer relay rating can damage the transfer relay. This damage is not covered by warranty.
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