Velleman VMB4PD - Manual (Page 4)

VMB4PD 4
Connection
For connection between the modules, use twisted pair cable (ex. EIB 2x2x0.8mm
2 , UTP 8x0.51mm - CAT5
or other). Use minimum 0.5mm² cable. For long wiring (>50m) or if a lot of modules ( > 10) are connected
to one wire, use 1mm² cable. Connect the 12-18Vdc (mind the polarity) and connect the bus wires (mind the
polarity).
H
L
-
+
BUS
12V
VMB4PD
L H
-12V+ BUS
TWISTED
PAIR
(0.5mm ) 2
Connect a 9V battery (via the included cable) if you desire to power the clock in case of a power failure.
12V power supply
-
+
L
H
Velbus
9V backup
+
-
battery
J
Open
Hint: for advanced level only!
Solder island “J” when using a back-up battery in order to feed the battery.
12V power supply
-
+
L
H
Velbus +
-
J
Closed
9V backup
battery
Rechargeable
WARNING: NEVER use a regular battery (non rechargeable) when soldering island “J” to avoid
risks of explosion.