Siemens SINAMICS PERFECT HARMONY GH180 Operating Instructions Manual page 27

may be as much as several hundreds kilo watts energy loss emitted in the form of heat from
inside the system cabinet. This heat must be transmitted to the outdoor air or into the structure
of the building at a rate fast enough to prevent the ambient temperature from rising above the
rated conditions.
Note
Air Inlet Cooling
The customer is responsible to ensure proper cooling is provided at the inlet of each drive.
The drive is a parallel path forced air-cooled system using across-the-line blower(s). Each of
the cells and the transformer are cooled by centralized exhaust blower(s).
The cell section and transformer section exhaust air into an air duct. Each cell's input and
output power connections are made at the front of the cell means of bolted connections. The
bolted connections are located in line with the inlet air of the cell. For systems with mechanical
cell bypass, the contactors are mounted on the front panel of the power cells, located in line
with the inlet air of the cell. All of the bus and the contactors are therefore forced-air cooled,
at ambient temperature. Two phases of each cell's inputs are fused. The fuse ambient is the
same as the cell inlet air temperature.
If redundant blowers are provided, a cover plate is removed from the top of the enclosure and
a redundant blower cage assembly is installed. Dampers are installed at the front of the
redundant blower cage to prevent reverse air flow. The dampers are opened and closed based
on differential air pressure. The blower assembly design consists of a steel frame or cage with
mesh at the bottom side (duct interface jobs require alternative pre-engineered blower module).
Air is exhausted out of the front of the blower section in standard configuration products. Air
will be exhausted out of the back of the blower section only when rear ducting option is selected.
Provision is provided to cycle redundant blowers periodically by means of the control interface
from the NXG control.
Never energize the drive without operational blowers providing air flow.
When power is applied to the drive that is operating in an IDLE condition state, blowers must
be operational to remove heat generated by component losses. Failure to provide air flow for
heat dissipation could result in damage to the drive or its components,
Applying Medium Voltage without air flow will result in a trip from the Coordinated Input
Protection Scheme.
To remove the unit's latent heat, Siemens recommends running the blower for ten minutes
after removing Medium Voltage.
Air Cooled 6SR5
Operating Instructions, 07/2018, A5E42736645A_AB
CAUTION
Description
4.1 Cabinet Details
25