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Pre-installation Guidelines SIMATIC 545/555/575 System Manual

575 Fault Relay Operation (continued)

To use the fault relay to control the power to the electronic control system,

you must wire the relay so that it controls the interposing relays in the

supply line. An example of this is shown in Figure 2-6.

NOTE: Figure 2-6 is not a complete electrical diagram. It is for illustration

purposes only. A qualified control engineer should be aware of any relevant

regulations and design the system with these in mind.

FLT

CRM

Master Stop

Master Start

F3 F4 F5

P/S

FLT

CRM

Output

Modules

575 VME System

24V115V

TDR

CRM

Figure 2-6 Safety Chain Controlling Control System Power Example

In Figure 2-6, relay CRM is the interposing relay, and FLT is a 24-volt relay

in the low-voltage safety chain. TDR is a delay-on relay with normally

closed contacts. Note the use of pushbutton switches for master stop

(normally closed) and master start (normally open). Power to the control

system is applied when the master start switch is actuated. If the

time-delay relay opens before the fault relay is closed, then the control

system loses power. If either the master stop switch is actuated or one of the

fault relays opens, then the control system is turned off.

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