Connecting 24 V Relays - Woodward easYgen-2000 Series User Manual

3.4

Connecting 24 V Relays

Fig. 71: Protection circuit (example)
37535B
Woodward recommends the use of shielded, twisted-
pair cables for the CAN bus (see examples).
– Lappkabel Unitronic LIYCY (TP) 2×2×0.25
UNITRONIC-Bus LD 2×2×0.22
–
NOTICE!
Damage to adjacent electronic components due to
induced voltages
– Implement protection circuits as detailed below.
Interferences in the interaction of all components may affect the
function of electronic devices. One interference factor is disabling
inductive loads, like coils of electromagnetic switching devices.
When disabling such a device, high switch-off induced voltages
may occur, which might destroy adjacent electronic devices or
result interference voltage pulses, which lead to functional faults,
by capacitive coupling mechanisms.
Since an interference-free switch-off is not possible without addi‐
tional equipment, the relay coil is connected with an interference
suppressing circuit.
If 24 V (coupling) relays are used in an application, it is required to
connect a protection circuit to avoid interferences.
Fig. 71 shows the exemplary connection of a diode as
an interference suppressing circuit.
easYgen-2200/2500 | Genset Control
Installation
Connecting 24 V Relays
83