10. Multi-line 300 as a safety system
10.1 Fast over-current protection (ANSI 50/50TD)
10.1.1 Introduction to safety system for ANSI 50/50TD
This chapter describes the controller wiring and parameter setup for the controller when it is used as the primary short circuit
protection for fast over-current protection (ANSI 50/50TD). The current measurement for this protection is based on the highest
value of all 3-phase current true RMS values. The safety approval for primary short circuit protection only applies when you follow
the installation and setup requirements in this chapter.
INFO
This setup for the safety system for short-circuit protection can be used when accepted by the local class approval society.
MORE INFORMATION
See AC configuration and nominal settings, Source AC protections, Fast over-current (ANSI 50/50TD) in the
Designer's handbook for more information about the protection and default settings.
10.1.2 Current transformer requirements
When the controller is used as a safety system (primary short-circuit protection), the secondary side of the current transformer must
have a nominal rating of 1 A. This rating must also be configured in the controller settings under Configure > Parameters >
Generator > AC setup > Current transformer.
INFO
You can use a current transformer with a nominal rating of 5 A on the secondary side when the controller is used for other
applications.
10.1.3 Power supply requirements
When the controller is used as a safety system (primary short-circuit protection), the power supplies to the controller must have a
backup power supply installed.
10.1.4 Function requirements
When the controller is used as a safety system (primary short-circuit protection), the functions listed in the table below must be wired
and configured to the indicated modules.
CAUTION
The breaker control must be configured to a normally open relay.
Table 10.1 Functions for the safety system and the required module
Function Module
Local > System OK > Status OK PSM3.1
Breakers > [Breaker] > Control > [Open] IOM3.1, IOM3.4
INSTALLATION INSTRUCTIONS 4189340909I UK Page 133 of 144
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