Connecting
5.1 Operation of the CM on grounded/ungrounded power supply
SIMATIC RF166C
Operating Instructions, 12/2019, C79000-G8976-C578-01
31
Components and protective measures
A number of components and protective measures are prescribed for plant installations. The
types of components and the degree to which the protective measures are mandatory
depend on the IEC regulation that applies to your plant setup.
The following table shows the components of the electrical design with reference to the
previous figure and compares the IEC regulations.
Table 5- 1
Components of the electrical design
Screen num-
ber
Components
IEC 60364
IEC 60204
①
Disconnecting device for
controller, sensors, and
actuators
Main switch
Disconnector
②
Short-circuit and overload
protection
Single-pole protection of
circuits.
Protect all power supply
lines with a 24 V DC / 16 A
circuit breaker.
Single-pole protection must
be used for a grounded
secondary circuit.
③
Circuit breaker
Protection of cables and
lines against overcurrent
--
Insulation monitoring
Isolation monitoring must be provided in the following cases:
●
Design of the communications module with ungrounded reference potential
●
If hazardous plant states can be expected as a result of faults.
Summary of Contents for SIMATIC RF166C
Page 6: ...Table of contents SIMATIC RF166C 6 Operating Instructions 12 2019 C79000 G8976 C578 01 ...
Page 20: ...Description 3 3 Design SIMATIC RF166C 20 Operating Instructions 12 2019 C79000 G8976 C578 01 ...
Page 160: ...Dimensional drawings SIMATIC RF166C 160 Operating Instructions 12 2019 C79000 G8976 C578 01 ...
Page 176: ...Service Support SIMATIC RF166C 176 Operating Instructions 12 2019 C79000 G8976 C578 01 ...