Using an AGS Module: Setup
Page 82
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2017 Sensata Technologies
SETUP: 04A Gen Run DC Volts Menu
This menu provides the option to start the generator when the battery voltage gets low, and to
stop the generator either when the battery reaches a higher voltage level, or when the battery
has been fully charged and goes into the Float Charge stage. Using voltage is the most common
method of automatically starting and stopping the generator because it is considered the simplest
and easiest to understand. The
04A
Gen Run DC Volts
menu also has start and stop delay settings
that minimize nuisance starts/stops to prevent short cycle run times of the generator.
• Set Gen Run DC Volts (Start Volts)
– This setting starts the generator when the battery
voltage (on Terminals #3 & #4 of the AGS) decreases to or below this setting continuously
for the duration of the
Set VDC Delay Times (Start Delay)
setting.
Default settings:
Start Volts = 11.5 VDC (12v), 23.0 VDC (24v), 46.0 VDC (48v)
Ranges:
OFF, 9.0-15.9 VDC (12v), 18.0-31.8 VDC (24v), 36.0-63.6 VDC (48v)
Where should I set Start Volts?
The VDC start voltage must be high enough to not over-
discharge the battery, but low enough to keep from nuisance starting the generator. Typically,
the start volts setting is set based on what is determined to be approximately 50% of the battery
capacity. Since this is an inverter/battery system, and the battery is normally loaded, the VDC
used to determine 50% battery capacity should be set lower than what is shown on typical
battery voltage SOC charts (approximately 11 to 11.5 volts in a 12-volt system), which shows
the battery at rest (unloaded). A typical start voltage setting would be between 11.0 - 11.5 VDC
for a 12-volt system.
Info:
The
Gen Run DC Volts
feature uses the voltage as shown on the METER button’s
04B DC Volts to AGS
menu to determine when to autostart and autostop the generator.
Info:
Using a 12-volt battery as an example, a typical SOC (State of Charge) battery
chart shows that 12.2 VDC is considered 50% SOC. This voltage is a battery “at rest,”
meaning it has no load connected and has been at rest for a minimum of 30 min. While
this voltage is accurate under these at rest conditions, this same voltage with a load
applied means the battery is well above 50% SOC, and should be set much lower.
However, the larger the battery bank the less the voltage is affected by a load applied
to the battery bank.
Info:
When using the
04A Gen Run DC Volts
feature, ensure the
Set Gen Run DC Volts
(
Start Volts
) setting is higher than the 0
2B Low Battery Cut Out
(
LBCO) Volts
setting
(under
SETUP/02 Inverter Setup
). This prevents the inverter from shutting down before
the generator comes on. The
04A Gen Run DC Volts
setting should be high enough to
allow suf
fi
cient time until the generator is allowed to start (i.e., start delay time) and
the inverter is allowed to connect (i.e., warm-up time and AC input delay time). Set
the
Set Gen Run DC Volts
(
Start Volts
) setting at least 1-volt higher than the inverter’s
LBCO setting, and then adjust depending on how long it takes the battery voltage to fall
under normal usage conditions.
• Set
VDC Delay Times (Start Delay)
–
This setting determines how long the
Set Gen Run
DC Volts (Start Volts)
parameter must be continuously maintained before autostarting the
generator. This ensures the generator does not nuisance start. By setting a delay, momentary
surges from heavy loads—that can cause the battery voltage to dip—do not start the generator
unnecessarily.
Default setting:
Start Delay = 120secs
Range:
0-127 Seconds,
then
1-127 Minutes
Where should I set Start Delay?
First, determine what loads will be running when the generator
needs to start. The larger the load the shorter the delay time setting. When a large load is applied
to the battery bank the battery voltage drops quickly, so the delay time should be short to ensure
the batteries are not over-discharged. If you are not sure what loads might be running or where
to set the start time delay, error on the side of setting a shorter time such as the default of 2
minutes (to protect batteries from over-discharge).
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