4 Operating From a Personal Computer
Operation Guide Flatpack MCU,
351300.013, v8-2006-07
61
• No Contactor
No contactor installed on this control output
• Normally Open / Normally Closed
Generally, normally open, NO, and normally closed, NC, relay contacts refer to the position of the
contacts when the relay coil is not energized. For example: a normally open, NO, relay contact closes
when the relay coil is energized.
In systems using the Fail Safe Operation Mode, the relay coils are energized in the system’s normal
mode of operation. When the system is in alarm mode, the relay coils are de-energized.
The Eltek factory settings for Load and Battery contactors are:
- Load Contactor = The contacts are closed, NC, and the coil de-energized (must be energized to
disconnect the load)
- Battery Contactor = The contacts are open, NO, and the coil de-energized (must be energized to
connect the batteries)
• Mains Dependent
When enabled, a Mains Failure alarm must be present AND measured Rectifier Current must be below
10 amperes, in order to operate the low voltage disconnect. This is the recommended setting, as this
prevents a disconnect event due to a loss of DC voltage sensing to the MCU.
When disabled, the LVD will be dependent only on the voltage setting; and the disconnect timer value is
not applicable.
4.11.2 System Calibration
Calibration of the system is performed in the factory. The factory calibration is done at two different
calibration points, 0A and at 50-60% of the systems maximum capacity. The system will normally not
require any further calibration, except when the Flatpack MCU has been moved from one system to another
system with much less/higher total capacity. The following parameters can be calibrated, if necessary:
• Battery Temperature
• Rectifier current
• Output voltage
• Battery current
• Symmetry Voltage
9
NOTE: Changing the LVD setup in a live system could cause load or battery
disconnection.
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