Hardware Configuration W/ Electrical Isolation - Bosch CL200 User Manual

17.2.2

Hardware Configuration w/ Electrical Isolation

L1
L2
L3
N
PE
OC III
400 V
Power
supply 1
OC II
24 V
OC = Overvoltage Category
1070 072 145-102 (01.07) GB
The provisions of DIN EN 60204-1 requires electrical isolation to exist bet-
ween the logic circuits of the central processing unit and the I/O interfaces
connecting the peripheral modules. As the NT200 power supply module is
non-floating, the required electrical isolation can be achieved only by provi-
ding a separate power supply unit for the NT200 on the one hand, and the
peripherals on the other.
OC III
400 V
Power
supply 2
OC II
230 V
Power
supply 3
OC 1
24 V
The power supplies 2 and 3, which provide operating power to the NT200,
may also be substituted by a single 400 V / 24 V combination power supply. If
this is the case, overvoltage category (OC) II will apply to the logic circuits.
It is often desirable to isolate groups of input and output signals from each
other. To accomplish this, several power supplies or power supplies featu-
ring several separate output voltages may be used to replace power supply 1
(diagram).
230 V power supply
for programming unit, etc.
24 V power supply
for peripheral modules
Installation
17–3