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SECTION 9 |
Operation of Battery Back-up
Availability of AC power is signaled for remote monitoring through an opto-coupled
signal through the d-sub connector (see page 9 under "Remote Monitoring & SignalI-
ing"). This signal may also be used to indicate that the load is being powered by battery
(in case external battery is used for battery back-up).
When the input AC power returns, the battery will be isolated and the load current
will once again be supplied by the power supply. The discharged battery will recharge
through R1 & R2 (R1 & R2 are in parallel offering a net resistance of 0.73 Ohm).
NOTE: The value of charge limiting resistors is based on a typical 100AH deep cycle ma-
rine battery. If a different type of battery is used, the value of the resistor should
Be adjusted to meet associated charging requirements.
SECTION 10 |
Output Voltage Adjustment
NOTE: The voltages indicated are at no load and are measured at any of the module
output pads under S5 and S6 or at the DC bus before the Schottky Diode D1.
Parallel Operation Under Forced Current Share Control
The output voltage of each module measured at the module output pads under S-5
AND S-6 (see Fig.1) Is factory pre-set at 28V. A precision multi turn potentiometer VR1 is
provided for fine adjustment of the output voltage of the module (The adjustment range
is 26.8V to 28.5V ).
For the forced current share control to work properly, it is important that the output
voltage of each module connected in parallel is exactly the same. When 2 or more
modules are operating in parallel under forced current share control and if the output
voltage of any module is below 28V, it's current share control circuitry will not function
properly and it's LED will start flashing. The LEDs of the other modules which are put-
ting out 28V will remain continuously lighted and the output voltage of the common
DC bus (before the Schottky Diode D1) will be 28V.
If the output voltage of any module is higher than 28V, it's LED will remain continu- ous-
ly lighted but the LEDs of all the other modules will flash randomly. The output
voltage of the common DC bus (before the Schottky Diodes D1) will read the higher
voltage of this module.
Adjusting The Output Voltage Of The Modules At No Load
NOTE: The output voltage is adjusted by multi turn potentiometer VR1 ( Fig.1). As the
adjustment is very fine, multiple turns will be required even for small voltage change.
Turn clockwise for decreasing and anti-clockwise for increasing. The adjustment range is
26.8V to 28.5V.
As explained under "Operation Of Battery Back up", although the output voltage at the
module terminals S5 and S6 (Fig.1), or at the common DC bus (before the Schottky Di-
SAMLEX AMERICA INC. | 13
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