6 Assembly Instructions
6.2 Power Supply and Grounding
Hazardous A rea Safe Area enCore device
CPU board
24V
0V
PE
+24V DC
Fuse 1A slow
0V
Fig. 6-1: Power supply
The enCore FC must be operated with a rated voltage of 24 V DC (max.
permissible range: 20.4 V to 28.8 V).
The 24 V power supply is connected via the (+) and (–) terminals at the rear
of the device, and must be protected externally using a 1A time-delay fuse.
It is recommended to operate the process computer in conjunction with an
uninterruptible power supply. Its design must comply with EN 60654-2 for
direct current; nominal voltage 24 V DC, permitted range 20.4 V DC to
28.8 V DC, switching time not exceeding 10 ms. The external power supply
must provide at least 12 W power. With a mains voltage of 100 V up to
230 V for the uninterruptible power supply, the switching time must not be
greater than a mains period (50 or 60 Hz), based on the nominal value of the
mains frequency.
The device is protected internally by means of a self-resetting over-current
protection component.
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