Velleman projects K8028 Assembly instructions - Manual (Page 9)

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Note: this kit operates on mains voltage, which is hazardous.
Ensure that it is not connected to mains when working on the PCB or when connecting one or more pushbuttons.
Connect the PCB according to the diagram on page 8
First connect the lighting points to the output connector “LOAD”.
Finally, low voltage incandescent bulbs or low voltage halogen lamps can be connected using ferromagnetic
(wound) transformers.
For the speed control function (Function No.13), you have to connect a synchronous motor. When the K8028
is connected to the mains, the microcontroller will first do a self test after which it will check the communica-
tions with the EEPROM, and the voltage and current zero-cross detection.
The four LED’s (LD4...LD3...LD2...LD1) will light up one after the other, in order to check that these LED’s are
working properly. In the very first start-up procedure, the LD1 will light up for 3 seconds. During this time, the
standard periods are stored in the EEPROM memory. These periods amount to 3 min. for DELAY1 and 1
min. for DELAY2. The mains frequency is then measured. If it is 50Hz, LD3 will also light up, if the lighting
network is 60Hz, LD2 will light up.
If an irregularity is found by the microcontroller during the self-test, LD1 will flash a number of times. The user
will then know where the fault lies in the K8028 according to the number of flashes (see table).
19. Connection and test
Connection and test
H8028IP'2-rev3.pub
page 9 Monday, August 27, 2012 10:04