Connecting discrete module power supplies (IP20)

General

There are several types of power supply which may be connected to monobloc TBXs or to modular TBX base units:

"SV" power supply for the module, common to all modules,
"IS" power supply for sensors, for modules containing inputs (excluding TBX DMS 16P22),
"OS" power supply for preactuators, for modules containing outputs (excluding TBX DMS 16P22),
"S" power supply for sensors and preactuators, for the TBX DMS 16P22 module (8 inputs and 8 programmable I/O).

NOTE: If there is only one external power supply, the + terminals for the SV, IS, OS and S power supplies can be connected together.

However, it is essential that the - terminals for these power supplies be connected together.

The advantage of using separate external power supplies is that it is possible to cut the input or output supply without cutting the supply to the communication module.

Module power supply SV

This supplies the communication modules (base module SV ) and the I/O control circuits.

This supply is isolated up to 1500 Vrms from ground.

The nominal voltage applied to terminals SV+ and SV- should be the same as the supply voltage for the I/O. For example:

for a 24 V input base unit, the SV supply is a 24 V,
for a 48 V input base unit, the SV supply is a 48 V,

For modules with relay outputs, SV supplies the coils of these relay outputs.

Sensor power supply IS

If the TBX module does not have a wiring check function, the IS power supply is distributed on the Cs terminals of the terminal block, to enable the sensors to be wired (intermediate wiring blocks are no longer required).

This IS power supply is continuously monitored to enable the inputs to be processed coherently, during a power break or power return (except for TBX DES 16F22 used with fast filtering).

For modular TBX modules with a wiring check function, the IS supply is distributed on the Csn,n+1 terminals of the terminal block via current limiters, which enables the current to be limited on the line, should a short circuit occur in the application.

Each +Csn,n+1 ( 0,1 A max. current) or +Cs (unprotected) sensor power terminal can supply two sensors.

Preactuator power supply OS

The OS supply is continuously monitored at the 0.5 A and 2 A transistor outputs and then distributed on the CA terminals of the connection block used for wiring the preactuators (intermediate connection blocks are not required).

Monitoring the voltage enables the outputs to be processed coherently when a power break or power return occurs.

Each 0 V (-CA) terminal wires 2 preactuators.

For 2 Amp transistor output modules, a wiring comb must be used, reference TBX RV 015, to connect the + terminals together (terminals +OSn,n+1) and to avoid excessive currents in the card.

"S" power supply for sensors and preactuators

The S sensor and preactuator power supply (TBX DMS 16P22) is distributed on the C terminals of the terminal block, for wiring the sensors and preactuators (intermediate wiring blocks are no longer required).

Monitoring this voltage enables the inputs and outputs to be processed coherently.

NOTE: Supply voltages generated by rectifying/filtering the AC supply should not exceed 30 V.