Braking Resistors; Description - Siemens SINAMICS S120 System Manual

Braking resistors

8.1

Description

A braking resistor is used to dissipate the excess DC link energy in generator operation. Braking
resistors are connected to a Braking Module.
Resistors are available with and without thermostatic switch with various rated power levels.
The thermostatic switch monitors the braking resistors for overtemperature and issues a signal
at an isolated contact if the limit value is exceeded.
Braking resistor
Braking resistors without a thermostatic switch
6SN1113-1AA00-0DA0
Resistance: 17 Ω
PN: 0.3 kW
6SL3100-1BE31-0AA0
Resistance: 5.7 Ω
PN: 1.5 kW
Braking resistors with a thermostatic switch
6SE7018-0ES87-2DC0
Resistance: 80 Ω
PN: 1.25 kW
6SE7021-6ES87-2DC0
Resistance: 40 Ω
PN: 2.5 kW
6SE7023-2ES87-2DC0
Resistance: 20 Ω
PN: 5 kW
Installation
The braking resistors can be installed standing on the floor of the control cabinet or suspended.
The braking resistors must be located outside the cooling airflow of the drive lineup.
Positioning the braking resistor outside the control cabinet or switchgear room enables the
resulting thermal losses to be routed away. This reduces the level of air conditioning required.
Connection cables
A shielded connection cable (3 m, 3 x 1.5 mm
6SN1113-1AA00-0DA0.
All other braking resistors are supplied without a connection cable. The maximum conductor
cross-sections are listed in the technical data.
The maximum cable length for all braking resistors is 10 m.
High Frequency Drive
System Manual, 10/2020, 6SL3097-5AH10-0BP0
Braking Module Booksize
x
x
2 ) is supplied with braking resistor
8
Braking Module Booksize
Compact
x
x
x
x
x
121