Outback Power Systems GS4048A Operators Manual - Manual (Page 27)

Operation
900-0161-01-00 Rev A 25
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 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
functions, all of which are operated by the MATE3 system display. (See page 45.) Another example is the
MATE3’s
AC INPUT hot key menu, which can order all inverters to disconnect when set to Drop.
Generator Input
A generator should be sized to provide enough power for all inverters, both for loads and for battery
charging. The generator’s voltage and frequency must match the inverter’s acceptance settings.
It is usually recommended that the generator be sized at twice the wattage of the inverter system.
Many generators may not be able to maintain AC voltage or frequency for long periods of time if they
are loaded more than 80% of rated capacity.
The generator is required to have a stable output before its power is accepted by the inverter. Some
generators with less stable or uneven outputs may not be accepted. The use of the
Generator input
mode may assist with this problem.
Transfer
The inverter uses a transfer relay to alternate between the states of inverting and of accepting an AC
source. Until the relay energizes, the output terminals are electrically isolated from the input that is in
use. When it closes, the input and output terminals become electrically common. (The terminals for
the unused input remain isolated during this time.) When the relay changes states, the physical
transfer delay is approximately 25 milliseconds.
CAUTION: Equipment Damage
Current draw in excess of the transfer relay rating can damage the transfer relay. This
damage is not covered by warranty. Use protective devices of appropriate size.