4 Operating From a Personal Computer
38
Operation Guide Flatpack MCU,
351300.013, v8-2006-07
Input configured as DISABLED: disables the configurable input.
Input is configured as ALARM: The Flatpack MCU will enter alarm condition on either an open or short circuit
condition, depending on the state of the “failsafe” checkbox. When the checkbox is selected (“ticked”), an open circuit
on a particular input (to AGND) will cause an alarm condition, and a shorted input (closed contacts) clears the alarm.
Each input’s alarm logic can be configured independently of the other inputs, providing a flexible external alarming
solution.
Input configured as BATT TEST CONTROL: If the input goes to alarm condition, a “start battery test” event will be
sent to the battery test module. This will start a battery test if the system is in idle state (No battery test). The text “Test
ext. active.” (meaning that battery test start has been triggered by an external input) will be added to the alarm log in
addition to the texts added from the battery module. If the system already is in battery test mode the text “Test
alr.started” will be added to the alarm log.
If the input goes out of alarm condition, a “stop battery test” event will be sent to the battery module. Any ongoing
battery test will then be aborted (even if the ongoing battery test is an interval test or manual test started from Winpower
Silver). The text “Test ext.deactiv” (meaning that battery test stop has been trigged by an external input) will be added
to the alarm log in addition to the texts added from the battery module. If a test is in progress, (all kind) it will be
stopped when the output voltage has reached the end voltage or if the max test time has expired, independent on the
state of the input. If the system is in idle state (No battery test) when the input goes low, the text “Test alr.stopped” will
be added to the alarm log.
Input configured as GENERATOR INPUT: Generator feed functionality is suitable in systems equipped with a
generator as backup mains source. Configuring any of the 5 configurable inputs to “Generator Input” enables “slow
current walk in” at generator start up. The chosen input will read a signal from the generator to determine whether the
generator is running/not running.
If the input enters alarm condition, it is assumed that the generator has started. If charge current limitation is enabled,
the value for Generator Feed Current Limitation will be used to limit the battery current. If the system has critical mains
fail (Mains alarm and rectifier current below 10A), this transition will prepare the system for “slow current walk in”.
If the input goes low, it is assumed that the generator has stopped. If “Charge Current Limitation” is enabled, the
general value for “Charge Current Limitation” will be used to limit the battery current. This transition will also stop
“slow current walk in”.
The purpose of this function is to give the generator a soft start by slowly stepping up the output voltage. The voltage
will be raised in about 0,1V steps. The number of steps and time between steps before the desired voltage is reached
will be calculated from the “Slow Current Walk In Rise Time” value in the Charge current configuration.
The level set in “Maximum charge current” for generator feed overrides the stepping of output voltage. In case of a
critical mains fail, the system will wait for the generator to start. When the generator starts, the chosen digital input will
go high. The system will then prepare for slow current walk in by lowering the pwm output to 1 V below the battery
voltage. When the mains reappears (generator running properly) the pwm will, after about 1 second, be regulated slowly
up towards the Set Voltage. If charge current limitation is enabled, the battery current will control the stepping of the
pwm. If charge current is disabled, the pwm will be stepped up with a fixed value each time the timer expires. There are
several criteria that will make the system leave the Slow Current Walk In state:
• Pwm is equal to or above a defined pwm level corresponding to the desired output voltage.
• Output voltage is equal to or above the desired Set Level.
• Desired Rise Time expires.
• Critical Mains fail
• Generator stops
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