Braking Resistors; Description; Safety Instructions For Braking Resistors Chassis Format - Siemens S120 Manual
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Also See for S120:
- Function manual (1094 pages) ,
- Diagnostic manual (947 pages) ,
- Manual (848 pages)
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DC link components
5.2 Chassis
5.2.2
Braking resistors
5.2.2.1
Description
The braking resistor is used to reduce the excess DC link energy in regenerative operation.
The braking resistor is connected to the Braking Module. The braking resistor is mounted
outside the cabinet or switchgear room. This means that the resulting heat loss around the
Power Module can be dissipated - and cooling costs/equipment reduced.
Resistors with unit ratings of 25 kW and 50 kW are available.
Braking resistors can be used on Power Modules with a voltage range. This is the reason
that the voltage can be changed by setting the response thresholds at the Braking Module to
reduce the voltage stress on the motor and Power Module.
A temperature protection switch monitors the braking resistor for overtemperature and issues
a signal on a floating contact if the limit value is exceeded.
5.2.2.2
Safety instructions for braking resistors chassis format
Danger to life if the fundamental safety instructions and residual risks are not observed
The non-observance of the fundamental safety instructions and residual risks stated in
Chapter 1 can result in accidents with severe injuries or death.
• Observe the fundamental safety instructions.
• Consider the residual risks for the risk evaluation.
Danger to life due to electric shock caused by applied voltage and residual charge of the
DC-link capacitors on the braking module
Contact with live connections on the Braking Module can result in death or serious injury.
• Only connect the Braking Module when the Power Module is disconnected.
• Only connect the Braking Module after five minutes has elapsed. Measure the voltage
Danger of fire through overheating for insufficient ventilation clearances
Insufficient ventilation clearances can result in overheating with danger to persons as a
result of smoke and fire. Further, increased failures can occur and the service life of
units/systems shortened.
• It is essential that you maintain a cooling clearance of 200 mm on all sides of the
204
WARNING
DANGER
before starting work on the DCP and DCN DC-link terminals.
WARNING
component (with ventilation grills).
Manual, (GH6), 04/2014, 6SL3097-4AL00-0BP4
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