Product Manual

Operation
900-0145-01-01 Rev B 25
The AC input current is used to power both loads and battery charging. The combined amount should not
exceed the size of the AC overcurrent device or AC source. These devices should be sized appropriately
during planning and installation of the inverter system.

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, 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. This is true in all modes
except
Grid Tied
(see
NOTES
on page 26):
 Voltage (both inputs): 208 to 252 Vac (default)
 Frequency (both inputs): If output frequency is set to 50 Hz (default), the input range of acceptance is 45 to
55 Hz. If the output frequency is set to 60 Hz, the input acceptance range is 55 to 65 Hz.
 See Table 17 on page 67 for the available selections for these items.
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. This occurs after a specified transfer delay, which is an
adjustable menu item.
IMPORTANT:
The Radian’s output voltage can adjusted to a different nominal value for a particular
region. (See page 23.) If this occurs, the source acceptance range should be adjusted to
match this nominal value or the inverter may not accept the new source normally.

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
. There can be side effects to
changing the range of allowed voltages.

Each of the AC inputs has a settable
Connect 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:

The
Grid Tied
input mode does not use these acceptance limits and uses the
Grid Interface Protection
settings instead. (See page 17 for more information.) The inverter may not accept AC power if it meets the
settings noted here but does not meet the
Grid Interface Protection
settings.

AC Acceptance is controlled separately between the Radian inverter’s two inputs. An AC source that is
unacceptable on one input may be acceptable on the other if the input mode or settings are different.

Certain input modes
s
uch as
Mini Grid
may prevent the inverter from accepting AC power even if electrical
conditions are met. (See page 18.)
Several items external to the inverter may prevent the inverter from accepting AC power even if electrical
conditions are met. Some examples are the
High Battery Transfer
,
Grid Usage Time
, or
Load Grid Transfer