Line-side power components
2.2 Information on the disconnector unit
SINAMICS S120 Combi
30 Manual, Edition 07/2012, 6SL3097-4AV00-0BP3
2.2 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.
NOTICE
If an operational drive line-up is switched off using a line disconnector, then the voltage at
interface X21, terminal 3 (EP +24 V) and 4 (EP M) must first be interrupted at the S120
Combi. This can be achieved with a leading disconnecting auxiliary contact (≥ 10 ms), for
example.
This protects external loads located parallel to the drive on the same switching component.
The accessories required for the line disconnector must be selected from the manufacturer
catalogs. See also catalog NC61.
2.3 Overcurrent protection by means of line fuses and circuit breakers
Line fuses and circuit breakers should be used for the line/overcurrent protection in order to
limit the damage to the S120 Combi if a fault does occur. 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 2- 1 Characteristics of the line fuses and circuit breakers for S120 Combi Power Modules
Infeed Protective device Prospective short-circuit current
Fuse Circuit breaker
Rated current Tripping time Rated current Tripping time Minimum value Maximum value
16 kW 35 A < 10 ms 35 A < 15 ms > 1 kA < 65 kA
20 kW 63 A < 10 ms 63 A < 15 ms > 2.5 kA < 65 kA
Table 2- 2 Recommended LV HRC line fuses (gL) and circuit breakers for S120 Combi Power Modules
Infeed Recommended line fuse Recommended circuit breaker
16 kW 3NA3814 3RV1031-4FA10
20 kW 3NA3822 3RV1041-4JA10
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