Line-side power components
3.2 Information on the disconnector unit
38
SINAMICS S120 Combi
Manual, (GH9), 07/2016, 6SL3097-4AV00-0BP5
Information on the disconnector unit
A line disconnector is required to correctly disconnect the drive line-up from the line supply.
The line disconnector of the machine's electrical equipment can be used for this purpose.
The line disconnector must be selected in compliance with the requirements of the
internationally binding standard relating to the electrical equipment of machines EN 60204-1,
Section 5.3. The relevant technical data and any other loads connected to the electrical
equipment must be taken into account when making your selection.
Damage to loads connected in parallel caused by switching the line disconnector while
under load
When switching the line disconnector under load, the voltage applied can damage external
loads located parallel to the drive on the same switching component.
• Firstly, interrupt the voltage at the X21 interface, terminal 3 (EP +24 V) and 4 (EP M)
on
t
he S120 Combi. This can be achieved with a leading disconnecting auxiliary contact (≥
10 ms), for example.
The accessories required for the line disconnector must be selected from the manufacturer
catalogs. See also catalog NC61.
Overcurrent protection by means of line fuses and circuit breakers
Line fuses or circuit breakers must be used for cable protection/overcurrent protection. NH,
D, and DO type fuses with a gL characteristic or suitable circuit breakers according to
IEC 60947 can be used for this purpose.
Table 3- 1 Recommended line fuses and circuit breakers for S120 Combi Power Modules
Circuit breaker (IEC 60947)
1)
1)
Type AJT Class J, source: Ferraz Shawmut
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