Wiring
8.5 Connecting the supply voltage
S7-1500R/H redundant system
266 System Manual, 01/2024, A5E41814787-AF
Permissible cable temperature
Permissible cable temperature
When selecting the cable, note that the cable temperature during operation can be up to
30
°C higher than the ambient temperature of the S7-1500R/H redundant system.
Example: If you use the system in a switchgear cabinet at an ambient temperature of 30
°C,
you must use a connecting conductor with a temperature range of at least 60
°C.
With terminals that carry a current load of ≥ 8
A during operation, you must expect a cable
°C above the ambient temperature.
You can more exactly determine the required cable temperature for each application. To do
so, measure the cable temperature in the system at a load corresponding to the maximum
possible power and ambient temperature values.
You should specify other connection types and material requirements based on the electrical
characteristics of the circuits you use and the installation environment.
8.5 Connecting the supply voltage
Introduction
The supply voltage is supplied over a 4-pin connector at the front of or bottom of the R/H-
CPU.
Connection for supply voltage (X80)
The connections of the 4-pole connector have the following meaning:
+24 V DC of the supply voltage (current limited to 10 A)
Ground of the supply voltage (current limited to 10 A)
Ground of the supply voltage for loop-through
+24 V DC of the supply voltage for loop-through
Spring opener (one spring opener per terminal)
Figure 8-3 Connection for supply voltage
The cable connector enables you to loop the supply voltage uninterrupted, even when it is
unplugged.
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