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(page 4-52).
Uninterruptible Power Supply
The Thor VM2 contains an internal UPS battery.
The UPS battery is automatically charged when the Thor VM2 is placed in a powered dock, provided the safe charging tem-
perature conditions below are met.
When external power is removed, the UPS automatically powers the Thor VM2 with no user intervention. When running on
UPS power, the power management timeouts may be different than when vehicle power is applied.
The UPS allows the Thor VM2 to continue operation when not mounted in a dock or when the vehicle battery is being
swapped. When fully charged the UPS battery is designed to power the Thor VM2 for a minimum of 30 minutes at tem-
peratures of -20ºC (-4ºF) or greater.
If operating on UPS power and the UPS battery becomes critically low, the Thor VM2 performs a controlled shutdown.
If there is no external power available, there must be 10% or greater power in the UPS battery or the Thor VM2 does not
power on.
The UPS status LED and the Battery Control Panel can be used to monitor the state of the UPS battery.
Safe Charging Temperature Range
The internal temperature of the Thor VM2 is the trigger for UPS battery charging.
• The UPS battery is not charged when the internal Thor VM2 temperature is below 0°C (32°F). This corresponds to
an ambient (room) temperature of approximately -10°C (-14°F).
• The UPS battery is not charged when the internal Thor VM2 temperature is above 45°C (113°F). This corresponds
to an ambient (room) temperature of approximately 35°C (95°F).
• If the UPS battery cannot be charged due to a temperature extreme, the UPS Status LED (page 3-12) is amber.
Move the Thor VM2 to a different location to charge the UPS battery.
When the Thor VM2 is operated in an environment where the UPS battery is not able to charge due to temperature
extremes, the Thor VM2 should be removed to a location within the safe charging temperature range during off hours.
A discharged UPS battery cannot protect against data loss in the event vehicle power is interrupted.
Charging Timeout
• A fully discharged UPS battery normally recharges in less than 4 hours when the Thor VM2 is in a powered dock and
within the safe charging temperature range.
• If the UPS battery is not charged before an 8 hour (or 4 hours for some earlier software revisions) timeout period
expires, the UPS Status LED (page 3-12) is amber.
• The charge timeout is reset if charging resumes upon application of external power.
• The charge timeout is reset if charging resumes when the Thor VM2 enters the permissible temperature range for
charging.
Charging and Power Management
• Charging does not occur when the Thor VM2 is in ignition mode and the ignition is inactive.
• Charging of the UPS battery continues when the Thor VM2 is in power management (user idle, system idle or
suspend modes).
Backup Battery
The Thor VM2 has a permanent Lithium battery installed to maintain time, date and CMOS setup information for a minimum
of 90 days. The lithium battery is not user serviceable and should last four years with normal use before it requires replace-
ment.
Note: The backup battery should only be changed by authorized service personnel.
Safety requirements restrict the temperature at which the Li-Ion UPS battery can be charged. Charging is disabled
if the ambient temperature is outside of the 0ºC to 35ºC safe charging range. In order to maintain UPS charge the
Thor VM2 should have power applied while the unit is within the safe charging range for at least an hour each day.
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