Wiring the Power Supply

Overview

To distribute current for the 24 Vdc I/O power segment(s) and TM7 power bus, and according to the power distribution description, the following modules and blocks are connected to an external power source:

Transmitter module (TM5SBET7)
Power Distribution Block (PDB)
I/O blocks

Source power for these can come from one or more supplies. Your requirements are dictated by:

voltage and current needs
isolation requirements

NOTE: Connect the 0 Vdc power circuits together and to the functional ground (FE) of your system to meet the EMC requirements.

DANGER
	HAZARD OF ELECTRIC SHOCK, EXPLOSION, OVERHEATING AND FIRE Do not connect the modules directly to line voltage. Use only isolating PELV systems according to IEC 61140 to supply power to the modules. Connect the 0 Vdc of the external power supplies to FE (Functional Earth/ground). Failure to follow these instructions will result in death or serious injury.

Wiring the Transmitter Module (TM5SBET7)

The TM5SBET7 is the connection to the external 24 Vdc power supply and the beginning of the power distribution for the TM7 remote configuration. The power is supplied by one external isolated power supply depending on current needs and capabilities.

The following figure shows the wiring of the TM5SBET7 wired with one external 24 Vdc power supply:

(2) External fuse, Type T slow-blow, 1 A, 250 V

PS1 External isolated power supply, 24 Vdc

NOTE: Connect the 0 Vdc power circuits together and to the functional ground (FE) of your system. If you do not interconnect the 0 Vdc circuits of the external power supplies, the status LEDs may not function correctly. In addition, there may potentially be more significant consequences such as an explosion and/or fire hazard.

DANGER
	POTENTIAL EXPLOSION OR FIRE Always connect the 0 Vdc terminals of the external power supplies to the functional ground (FE) of your system. Failure to follow these instructions will result in death or serious injury.

Wiring the PDB

The TM7SPS1A (PDB) reinforces the TM7 power bus. Power is supplied by one external isolated power supply depending on current needs and capabilities.

The following figure shows the wiring of the PDB with one power supply:

(1) External fuse, Type T slow-blow, 1 A minimum, 4 A maximum, 250 V

(2) Maximum current 4 A

PS1 External isolated main power supply, 24 Vdc

NOTE: Connect the 0 Vdc power circuits together and to the functional ground (FE) of your system to meet the EMC requirements.

DANGER
	HAZARD OF ELECTRIC SHOCK, EXPLOSION, OVERHEATING AND FIRE Do not connect the modules directly to line voltage. Use only isolating PELV systems according to IEC 61140 to supply power to the modules. Connect the 0 Vdc of the external power supplies to FE (Functional Earth/ground). Failure to follow these instructions will result in death or serious injury.

Wiring the I/O Block

When you provide power to a TM7 I/O block using the 24 VDC Power OUT connector of the preceding I/O block, both blocks occupy the same 24 Vdc I/O power segment. However, if you connect an external isolated power supply to the 24 Vdc Power IN connector of a TM7 I/O block, you establish a new 24 Vdc I/O power segment beginning with that I/O block.

When beginning a new 24 Vdc I/O power segment, select an external isolated power supply sufficient to the power requirements of the I/O blocks planned for that segment. For more information, refer to 24 Vdc I/O Power Segment Description.

The following figure shows a I/O block wired with one external 24 Vdc power supply:

(3) External fuse, Type T slow-blow, 8 A maximum, 250 V

PS2 External isolated I/O power supply, 24 Vdc

NOTE: Connect the 0 Vdc power circuits together and to the functional ground (FE) of your system to meet the EMC requirements.

DANGER
	HAZARD OF ELECTRIC SHOCK, EXPLOSION, OVERHEATING AND FIRE Do not connect the modules directly to line voltage. Use only isolating PELV systems according to IEC 61140 to supply power to the modules. Connect the 0 Vdc of the external power supplies to FE (Functional Earth/ground). Failure to follow these instructions will result in death or serious injury.