Wiring
4.10 Connecting the motor
SINAMICS G115D distributed drive
70
Operating Instructions, 12/2020, FW V4.7 SP13, A5E48681219B-002
Maximum current limit for daisy-chain connection
The maximum permissible number of daisy-chained converters depends on the maximum
current limit for daisy-chain connection. The table below gives the maximum current limits
dependent upon the cable cross-sections and surrounding air temperature:
Converter
IEC-compliant cable
UL-compliant cable
Connector variant
Glanded variant
Motor-mounted
converter
23 A @ 4 mm
2
, 40 °C
16 A @ 4 mm
2
, 55 °C
16 A @ 10 AWG, 40 °C
11 A @ 10 AWG, 55 °C
16 A @ 10 AWG, 40 °C
13 A @ 10 AWG, 45 °C
12 A @ 10 AWG, 48 °C
Wall-mounted
converter
25 A @ 6 mm
2
, 40 °C
21 A @ 6 mm
2
, 50 °C (FSA)
21 A @ 6 mm
2
, 55 °C (FSB/FSC)
24 A @ 9 AWG, 40 °C
16 A @ 9 AWG, 50 °C (FSA)
16 A @ 9 AWG, 55 °C (FSB/FSC)
16 A @ 9 AWG, 40 °C
13 A @ 9 AWG, 45 °C
12 A @ 9 AWG, 48 °C
Further information on protective devices
For both connector and glanded variants, the input for the daisy chained converters can be
protected by group fusing.
For more information about the permissible types of the group fusing, see the SINAMICS
G115D Product Information of Protective Devices:
Protective devices (
https://support.industry.siemens.com/cs/ww/en/ps/27867/man
Further information
If you don't use daisy chain connection, cover the unused connectors with the optional
connector cover kit to maintain the IP rating of the system.
Connector cover kit (Page 33)
4.10
Connecting the motor
WARNING
Electric shock by live parts in the motor terminal box
Hazardous voltage can be present on the pins for temperature sensor and motor holding
brake. Touching live parts on the motor cable and in the motor terminal box can lead to
death due electrical shock.
•
Keep the motor terminal box closed whenever the mains is applied to the converter.
•
Insulate the cables that are not used.
•
Use appropriate insulation on the cables.
NOTICE
Damage of the converter by disconnecting the motor cable during operation
The disconnection of the motor cable by a switch or contactor during operation may
damage the converter.
•
Disconnect converter and motor during operation only if it is necessary in terms of
personal security or machine protection.
