Table of Contents
Advertisement
● In other areas, the fuse must meet the following requirements:
– Suitable for DC (min. 60 V / max. 3 A)
– Breaking current > highest possible current of the current source (incl. short circuit
– Approval according to IEC/EN 60934
– Breaking characteristics: Max. 120 s at 2 x I
You do not need a fuse for the power supply cable if you use a voltage source according to
NEC Class 2 or a power supply from the range of accessories, see appendix Power supply
(Page 137).
Recommendation: Use the power supply of a process station if this is in the vicinity of the
gateway.
Note
Protective ground
A PELV circuit contains a connection to protective ground. Without a connection to protective
ground, or in case there is a fault in the connection to the protective ground, the voltage for
the circuit is not stabilized.
NOTICE
Fuses for the cables of the digital output (corresponds to "Limited Energy")
The current on the terminal must not exceed 1 A. Use a fuse for the power supply that
protects against currents > 1 A.
The fuse has to be designed for protection of DC power supply circuits as well as for the
following requirements.
• In areas subject to the NEC or CEC, the fuse must meet the following requirements:
• In other areas:
SIMATIC CC7
Operating Instructions, 10/2019, C79000-G8976-C503-02
current and fault)
– Suitable for DC (min. 60 V / max. 1 A)
– Breaking current min. 10 kA
– UL/CSA listet (UL 248-1 / CSA 22.2 No. 248.1)
– Classes R, J, L, T or CC
– Suitable for DC (min. 60 V / max. 1 A)
– Breaking current min. 10 kA
– Approved for power supply circuits (branch circuits) according to local regulations
(e.g. IEC 60127-1, EN 60947-1)
– Breaking characteristics: B or C circuit breakers and fuses
Installation, wiring, commissioning
n
3.3 Connecting
41
Advertisement
Table of Contents
