Namur Terminal Block (Option B00) - Siemens SINAMICS G150 Operating Instructions Manual

Electrical installation
4.10 Other connections
4.10.30

NAMUR terminal block (option B00)

Description
The terminal block is designed in accordance with the requirements and guidelines defined
by the standards association for measurement and control systems in the chemical industry
(NAMUR – recommendation NE37), that is, certain device functions are assigned to fixed
terminals. The inputs and outputs assigned to the terminals fulfill PELV ("protective extra-low
voltage and protective separation") requirements.
The terminal block only contains the necessary functions. Unlike the NAMUR
recommendation, optional terminals are not available.
The 24 V DC supply is provided on site via terminals -X2:1-3 (fuse-protected for 1 A in the
converter). You must ensure that the PELV safety requirements (protective extra-low voltage
with protective separation) are fulfilled.
To monitor the temperature of explosion-proof motors, option B00 features a PTC thermistor
release mechanism with PTB approval. Shutdown if limit value is exceeded. The associated
PTC sensor is connected to terminal -X3:90, 91.
The terminal block is divided into three sections:
● -X1; -X2: for the power connections
● -X2: for signal cables, which must fulfill PELV requirements with electrical separation.
● -X3: for connecting the motor PTC thermistor detector
Connection
Table 4- 70 Terminal block -X2 – connection 24 V supply
Terminal Designation
1
2 P24 V
3 P24 V
Max. connectable cross-section: 2.5 mm²
192
Default
M Reference conductor
24 V DC infeed
24 V DC outgoing circuit
Comment
Protected internally with fuse (1 A)
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A