BBH SCU Series, Installation Manual

Page: 26 / 303

3
Safety
HB-37500-810-11-16F-EN SCU Installation Manual - Master and Slaves - SARC Page 26 of 303
Status: 09.06.2022
Man
CAUTION Fire hazard in case of component failure
Provide adequate fuse protection for the 24 V DC power supply of the
control system in the end application! (Information on this can be found in
the Power supply section).
3.9. Behaviour in case of emergencies
The SCU units have been developed and built to be able to autonomously recognize
failures by means of diagnostics and to autonomously change into the safe status
(cf. chapter
“Safe status”).
CAUTION To eliminate wiring errors, the affected block must be de-energized,
because short circuits or incorrect tensions can cause failures in the block
DANGER
Working on the wiring or on the electric system can cause electric shock.
Electric shock can cause death or severe injuries due to electric current.
Therefore, work on the electric system may only be carried out by persons
who are qualified persons according to TRBS 1203.
3.10. Safe status
The safe status of the SCU unit is:
• All outputs of the group are safely switched off, and the unit is in the error
status. The error status remains until its cause has been eliminated and the
current error status has been confirmed.
• The status of the unit is permanently shown ong the 7-segment display, if the
7-segment display is supplied with voltage.
• Errors are sequentially displayed by a letter and 4 numbers (cf.
Troubleshooting).