QTech Data Systems DNP3 RTU - Manual (Page 30)

DATRAN XL4 RTU – Owners Manual – v1.1 June 2012
www.qtech.co.nz Page 30
amp TE5 fuse located on the Q22 Motherboard. The fuse is located at the lower right side of the Q22 Motherboard
as viewed with the front display panel to the right and the Q04 Processor board removed.
Location of Q22 2A Fuse
Low Voltage Detection Low Voltage Detection Low Voltage Detection Low Voltage Detection
The DATRAN XL4 incorporates a Low Voltage Detection circuit that automatically shuts down the XL4 and
associated peripherals if the supply voltage drops below a specified value. This feature is used to prevent the
power supply backup battery from becoming totally discharged and to protect against erratic system operation that
could occur if the supply voltage was low.
In many applications the XL4 is operated from power supply systems with either a 12V or 24V power supply. To
accommodate this, the voltage at which the Low Voltage Detection circuit activates can be configured for either
supply voltage scenario.
12V Module OFF at 10.5 volts and back on at 11.5 volts.
24V Module OFF at 21.0 volts and back on at 23.0 volts.
Location of the Low Voltage Detection Voltage Level Selection jumper
When jumper J27 is installed the trip voltage is 10.5V and when jumper J27 is open the trip voltage is 21V. Jumper
J27 is located at the lower middle side of the Q22 as viewed with the front display panel to the right and the Q04
Processor removed.
Additionally, the XL4 has a software derived low voltage alarm. This alarm turns on when the battery voltage is less
than 11.5/23.0 volts and turns off when the battery voltage is greater than 12.5/25 volts for 12/24 volts power
supplies respectively. The alarm status is available to the DLP and at the DATRAN Base Station (via a Variable
Status Poll).