40
Installation RSP 20/25/30/35
Release
 
15
 
12/2017
2.5.4 Supply voltage with the characteristic value TT
You will find information on the characteristic values here:
“Device name and product code” on page 19
 
You have the option of supplying the supply voltage redundantly, without 
load distribution.
Both supply voltage inputs are uncoupled.
Figure 6: Supply voltage with characteristic value TT: 2-pin terminal block with 
screw lock
Note: For the redundant power supply, only use voltage sources whose 
negative terminal is grounded. The use of different voltage sources can lead 
to equipment damage. 
For every supply voltage to be connected, perform the following steps:
 Remove the power connector from the device.
 Connect the wires according to the pin assignment on the device with the 
clamps.
 Fasten the wires connected by tightening the terminal screws.
 You find the prescribed tightening torque in chapter:
“General technical data” on page 49
 
With a non-redundant supply of the supply voltage, the device reports the 
loss of a supply voltage. You can prevent this message by applying the 
supply voltage via both inputs, or by changing the configuration in the 
Management.
Type of the voltages 
that can be 
connected
Specification of the supply 
voltage
Pin assignment
DC voltage Rated voltage range DC
12 V DC ... 24 V DC
Voltage range DC including 
maximum tolerances
10.2 V DC ... 32 V DC
+ Plus terminal of the supply voltage
− Minus terminal of the supply 
voltage
Table 9: Supply voltage with characteristic value TT: type and specification of the 
supply voltage, pin assignment