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Operation
900-0020-01-00 Rev A 17
AC Current Settings
The AC current settings control the amount of current that the inverter draws from the source(s). The
amount of current is controlled by the grid or generator limit settings. These settings should be
adjusted to match the size of the input circuit breaker. In the MATE3 system display, if the
Inverter
Input Priority
or
AC Input and Current Limit
menus are set to
Grid
, the inverter uses the grid settings.
If the menus are set to
Gen
, the inverter uses the generator settings.
This is intended to protect a generator or source that may not be large enough to supply enough current for
both charging and loads. If the combined charging and loads exceed this setting, the inverter will reduce its
charge rate and give priority to the loads. If the loads exceed this number on their own, the charge rate will
be reduced to zero.
The
Support
input mode allows the Radian inverter to support the AC source with power from the batteries.
See page 10.
If multiple parallel inverters are installed with an AC source of limited amperage, the total combined
amperage settings for all units must be less than the AC input circuit. The Configuration Wizard in the MATE3
can perform this calculation. However, the inverters do not perform this calculation. If the MATE3 or the
Configuration Wizard are not used, it is necessary to divide the input size by the number of inverters and
assign an equal part of the amperage to each port.
AC Source Acceptance
The input source must meet the following specifications to be accepted:
L1 (to neutral) 120 Vac, ± 12 Vac (default setting), and
L2 (to neutral) 120 Vac, ± 12 Vac (default setting), and
60 Hz, ± 6 Hz
When these conditions are met, the inverter will close its transfer relay and accept the input source.
This occurs after a delay which is specified below. If the conditions are not met, the inverter will not
accept the source. If it was previously accepted and then rejected, the inverter will open the relay and
return to inverting power from the batteries.
The voltage limits can be adjusted to allow (or exclude) a source with weak or irregular voltages. These
items are adjustable in the appropriate menu of the MATE3 (
Grid AC Input Mode and Limits
or
Gen AC
Input Mode and Limits
). The settings are titled
Voltage Limit Lower
and
Upper
. When this setting is
adjusted, it applies equally to L1 and L2.
There can be side effects to changing the range of allowed voltages. See page 18.
Each of the AC inputs has a settable connection delay. This is intended as a warmup period which allows
an input source to stabilize before connection.
The default setting for the Grid input is 0.2 minutes (12 seconds).
The default setting for the Gen input is 0.5 minutes (30 seconds).
These items are adjustable in the appropriate menu of the MATE3 (Grid AC Input Mode and Limits or Gen
AC Input Mode and Limits).
NOTES:
Certain input modes
s
uch as
Mini Grid
may prevent the inverter from accepting AC power even if electrical
conditions are met. (See page 13.)
Several items external to the inverter may prevent the inverter from accepting AC power even if electrical
conditions are met. One is the High Battery Transfer mode, which is operated by the MATE3 system display.
(See page 32 and the MATE3 Owner’s Manual.) Another is the MATE3’s
AC INPUT
hot key menu, which can
order all inverters to disconnect when set to
Drop
. (See the MATE3 manual.)
The inverter has additional criteria that control whether it sells power. The inverter may accept AC power but
refuse to sell if the acceptance criteria are met, but the grid-interactive criteria are not. (See the
Grid Tied
input mode on page 11.)