Velleman K8089, Illustrated Assembly Manual

Page: 10 / 16

10
Construction
4. Test and connection
1. Power supply:
Supply 9-12VAC to the inputs marked '12VAC'.
Make sure supply can deliver 300mA
Make sure to use an AC power supply. If you supply a DC voltage, the
accuracy of the clock will be 5% worst case.
2. Back-up battery:
Insert a 3V CR2032 battery in the battery holder. If power
fails, unit will retain the clock. Display will remain blank.
Note: Accuracy when running on backup battery: 5%
worst case. Consumption: +/- 1mA
CHECK IF THE CLOCK IS WORKING CORRECTLY (see page 13)
5. Optional temperature sensor
If you have ordered an additional temperature sensor K8067
or VM132 then you can let the temperature automatic toggle
with the time and sign.
Connect the terminals marked GND, V+ and IN to the corresponding terminals of
the temperature sensor. As this is a current loop sensor, you can run several
meters of wire between the sensor and the clock.
Optional temperature sensor