RiTTO TWINBUS, System Manual

Page: 121 / 197

Installation: Assembly, connection and start-up
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Option: Tone generator
The tone generator 1 6990 provides a signal tone at terminals – and 19.
Connection
Starting up
No start-up is required.
* Provide line safety switch
1. LED operating voltage 11 V AC
2. LED operating voltage 12 V DC
3. LED operating voltage 24 V DC
4. Plug-in slot for tone generator
Note:
Instead of conventional melting fuses, power supply unit 1 6371 has two electronic fuses that
interrupt the respective power circuit if an overload occurs. If one of these fuses activates, the
associated voltage indicator LED goes off. Proceed as follows to switch on again:
Switch mains voltage off and leave off for approximately 1 minute.
Remedy short circuit or overload.
Switch mains power supply on again.
The associated voltage indicator LED illuminates again.
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