Honeywell CIPer 50 Installation & Commissioning Instructions page 47

Example 2
When connecting multiple CPUs to a single transformer, it
is imperative that the polarity of the power supply terminals
of the CPUs and the polarity of the transformer always cor-
respond (namely: 24V-0 of the transformer must always be
connected to 24V-0 of the CPU, and 24V~ of the trans-
former must always be connected with 24V~ of the CPU).
Depending upon the individual CPU, the numbering of the
corresponding two terminals may possibly deviate from the
norm (which is usually "terminal 1 = 24V-0" and "terminal 2
= 24V~"). In the following example, CPU 3 has a deviating
numbering and must be connected accordingly.
NOTE: When using a single transformer for several CPUs,
each CPU ground must be wired separately to the
star-point.
NOTE: If the field device transformer is physically far away
from the CPUs, earth grounding must still be
performed for the controller.
NOTE: Use one star-point to split power for multiple CPUs
and field devices.
Connect earth ground to the proper terminal of the CPU.
►
CPU 1 CPU 2
24V~0 24V~ 24V~0
1 2 1
24 V~
L
LINE
N
24 V~0
NOISE-FREE EARTH GROUND
(ONLY ONE PER SYSTEM)
Fig. 59. Connecting and earthing multiple CPUs
CIPer MODEL 50 CONTROLLER – INSTALLATION & COMMISSIONING INSTRUCTIONS
DEVIATING
NUMBERING!
CPU 3 CPU N
24V~ 24V~ 24V~0 24V~0 24V~
2 2 1 1 2
24 V~
Y
GND
47 31-00233EFS-01