RT-UPS User Manual
Revision: 150609
5
Introduction
The RT-UPS is an uninterruptible power supply designed to prevent brown-out and
black-out conditions affecting our inertial navigation system (INS) products in real-
world applications. It supplies 12 volts at two amps for up to two minutes in vehicles
during engine cranking or if the driver stalls the engine and the ignition is turned off.
The RT-UPS is suitable for use with all INS products from OxTS.
Product features
Benefits of using an RT-UPS are:
Wide range of input voltage (9–48 V)
Brown-out and black-out protection during cranking
No need to re-initialise and warm-up system if power is accidentally cut
Internal battery charges while supplying the output
Isolated output
Transient protection for equipment
Description
The RT-UPS activates when power is applied to its input. If the input supply is
subsequently interrupted, or drops too low, the RT-UPS continues to output a constant
12 volts for up to two minutes using its internal battery. This prevents brown-outs
during vehicle cranking, and black-outs if the auxiliary power socket is accidentally
disconnected. In this way the INS continues to operate and there is no need to re-
initialise or perform additional warm-ups.
When the input power supply is absent a warning buzzer will sound and the RT-UPS
will continue to supply power to the output. If the RT-UPS does not detect a load on
the output the RT-UPS will turn off immediately and the buzzer will stop.
If the input power supply is restored within two minutes, the RT-UPS will revert back
to the vehicle’s power supply and charge the battery (if necessary). If the input power
supply is absent for longer than two minutes, the RT-UPS will stop the output power
and the “No Power” LED will illuminate for up to 10 minutes.
If the internal temperature of the enclosure exceeds approximately 75°C, then output
power will be turned off and the RT-UPS will enter standby for five minutes. It is not
possible to exit this mode—except by waiting five minutes.