MCA527
2.2.1 Switching on the Device
The MCA527 is set into operation by turning on the power switch (Figure 1). After that the
power supply checks the battery voltage and if it is higher than 6.8V it supplies the
complete device with power. The main processor boots now and the three LED indicators
flashes some times alternately for about 3 seconds. After finishing the boot process the
device enters into the idle state and the green LED flashes symmetrically with 2.5Hz.
When a connection to a control program was established the device enters into the
normal state and the green LED flashes symmetrically with 1.25Hz.
When the MCA527 is not working but the main switch is still on, the device has turned off
automatically because of a power failure or a loss of battery power. If a power failure
occurred, turn off and on again the main switch. The device should reboot and enter into
the idle state. If the batteries are empty, connect a charger first. The yellow LED shines
during charging and when the battery voltage reaches 6.8V the MCA527 turns on
automatically.
2.2.2 LED Indicators
The LEDs indicates the actual device state even if no computer is available or located far
away from the MCA. All possible states are shown in Figure 2.
The green LED shows the device state. After turning on, the device enters into the idle
state and only the green LED blinks symmetrically with 2.5Hz. When a successful
communication takes place, the MCA enters into the normal state and the green LED
blinks with 1.25Hz until a failure occurs. The failure is displayed by asymmetric blinking of
the green LED. During a firmware update the green LED shines permanently.
When the yellow LED shines it indicates that the internal charger is powered from an
external source (wall adapter or USB port) and charges the batteries. This LED shines
even if the MCA is turned off and the batteries are charged.
A red/blue bi-color LED displays information about the high voltage. If the LED is dark, the
HV is turned off. When it flashes red or blue with app. 1Hz the high voltage is active and
works properly. During the change from one value to another, the HV-LED is permanently
on until the high voltage has reached the new value. If a high voltage failure occurs, this
LED blinks red and blue alternately.
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