Novexx Solutions ALX 92x, Service Manual, Page: 335 / 824

12/14 Rev. 05 SERVICE MANUAL Service Electronics
64-xx Gen. 2 – DPM Gen. 2 – ALX 92x Gen. 2
22
External supply
CAUTION
In previous versions of this document, the external voltage supply of the USI
was described.
External voltage supply without external current limiting elements is no
longer permitted (risk of fire)
a
.
In case of applications that externally supply voltages, a current limiting
element
must be provided by the system integrator.
Examples of suitable current limiting elements in the supply circuit are:
• Poly fuse with UL 1434 approval
24 VDC: I
hold
= 0.65 mA; U
min
= 30 V
5 VDC: I
hold
= 0.65 mA; U
min
= 6 V
• Micro fuse according to IEC EN 60127
24 VDC: T 630 mA L 250 V
5 VDC: T 630 mA L 250 V
a) Due to an update of EN 60950-1.