SIEMENS
SINAMICS G150 NEMA
Engineering information
4
Siemens D11.7
(Part 1) – 2013
4/15
Braking units, maintenance accessory
Example
The design of the braking unit is to be calculated for a 200HP
(132 kW) drive.
The mean braking power is calculated as follows:
The Mean braking power = 90 kW x 17 s / 90 s = 17.0 kW
P
20
= 4.5 x 17.0 kW = 76.5 kW
Peak power = 0.8 x 90 kW = 72.0 kW
Result:
The mean braking power is the determining factor in the
configuration of the braking module and braking resistor,
i.e. a braking unit ≥ 76.5 kW should be provided.
The 100 kW braking unit is suitable.
When the response threshold is reduced, the required
braking power
P
20
is calculated as follows:
Mean braking power = 90 kW x 17 s / 90 s = 17.0 kW
P
20
= 4.5 x 17.0 kW = 76.5 kW
Peak power = 1.06 x 90 kW = 95.4 kW
Result:
The peak power to be generated is the determining factor
in the configuration of the braking module and braking
resistor, i.e. a braking unit ≥ 95.4 kW should be provided.
The 100 kW braking unit is suitable.
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Frame for exchanging power blocks
Power modules of SINAMICS G150 (and other SINAMICS
and the MICROMASTER 4 chassis) contain one or more
power blocks, depending on the frame size. The largest
power blocks weigh of the order of 220 lb (100 kg) each.
To replace or repair power blocks on these drives, it is
recommended that the auxiliary support frame described
here is used. The frame has been designed for use with all
existing sizes of power blocks.
The frame is vertically adjustable to cater for different
mounting heights in enclosures. The frame is designed to
be attached to the screw connections for the fan modules.
These need to be unscrewed first. A range of mounting
holes and adapters is provided to enable the frame to be
mounted to any of the power block construction types.
Description
Order no.
Frame for exchanging power blocks
6SL3766-1FA00-0AA0