Product Manual

Operation
900-0161-01-01 Rev B 25
AC Source Acceptance
The input source must meet the following specifications to be accepted. This is true in all
modes except
Grid Tied
:

Voltage (
G
RID
input): 108 to 132 Vac (default for both L1 and L2)

Voltage (
G
EN
input): 108 to 140 Vac (default for both L1 and L2)

Frequency (both inputs): If the output frequency is set to 60 Hz (default), the input acceptance range
is 54 to 66 Hz. If output frequency is set to 50 Hz, the input range of acceptance is 45 to 55 Hz.

See Table 17 on page 63 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 a MATE3-class system display (
Grid AC Input Mode and Limits
or
Gen AC Input Mode and Limits
). The settings are titled
Voltage Limit Lower
and
Upper
. When
adjusted, they apply equally to L1 and L2. 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
G
RID
input is 0.2 minutes (12 seconds).

The default setting for the
G
EN
input is 0.5 minutes (30 seconds).
These items are adjustable in the appropriate system display menu (
Grid AC Input Mode and Limits
or
Gen AC Input Mode and Limits
).
NOTES
:
The
Grid Tied
input mode does not use these voltage, frequency and time acceptance limits. It uses
the
Grid Interface Protection
and
Grid Support
settings instead. (See pages 16 and 43 for more
information.) The inverter may not accept AC power if it meets the settings noted here but does not
meet the settings in these two menus.

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 mode or settings are different.

Certain input modes such as
Mini Grid
may prevent the inverter from accepting AC power even if
electrical conditions are met. (See page 16.)
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
functions, all of which are operated by the system display. Another example is
the
AC
I
NPUT
hot key menu of a MATE3-class system display, which can order all inverters to
disconnect when set to
Drop
.