Velleman projects K6714 Assembly instructions - Manual (Page 12)

12
Tips at malfunctions
18. Remedies in the case of malfunction caused by the relays
I f the relays are used to switch alternating voltage, it may be necessary to
suppress them.
1. Suppressing resistive loads (Lamp, resistor,…) :
2. Suppressing inductive loads (Transformer, motor,…) :
3. When above solutions fail :
In this last case an independently feeded DC-relay is used, wich is installed
as close to the load as possible.
220V - 240V
Siemens SIOV
S14K275
110V - 125V
Siemens SIOV
S14K150
Pay attention to the diode witch is fit ANTI-parallel with the coil, its
cathode connected to the plus side, its anode connected to the minus
side! This relay MUST be feeded by a separate power supply. The
VDR must be suited for the voltage to be switched.
Fig. 3.3
Fig. 3.2
Fig. 3.1