matson MA98411, Manual

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Low Voltage Disconnect
The MPVSR can be used as a low voltage cut-out device when wired
in line between the load and the power source. This would be used in
situations where it is important to make sure the power source is not
drained too far, like a starting battery in a car, or a lithium battery being
used as a power supply. In the car example, a flattened battery means you
can’t start the engine and you are stuck. The lithium battery power supply
can be destroyed easily if it is discharged too far. In both case, low voltage
protection will allow for peace of mind and longer life expectancy for the
products involved.
Setting Guide: (note, this setup requires the MPVSR bet programmed
‘normally open’)
UPPER LIMIT IN VOLTS: This is the setting that determines when the
power would be re-connected and allow operation to resume once the
power source has returned to an acceptable level. In the car example,
this would be when the battery has been charged back to a safe voltage
to start the vehicle. It can be as little as 0.1V above the LOWER LIMIT IN
VOLTS.
LOWER LIMIT IN VOLTS: This is the voltage level where you want to
disconnect the load from the power source to prevent it getting too low. In
the car scenario, this would be the voltage level where if it got any lower
the battery would not be able to start the car.
UPPER DELAY IN SECS: This is the delay setting for re-connecting the
load to the power source. Delaying the re-connection allows the voltage at
the power source to stabilise before the load is connected again. This is
more important when the power supply is a battery.
LOWER DELAY IN SECS: This is the delay setting for disconnecting
the load. In the car scenario, without a delay set, the MPVSR might
disconnect the load when you try to start the vehicle, as the large load
when starting can drop the battery voltage significantly for a few seconds.
After starting the voltage would generally rise again to a safe level,
meaning it would not be necessary to disconnect the load from the battery.
In this situation it could even prevent you starting the vehicle.