DESCRIPTION
HANSEN P4 GEAR UNITS
FOR COOLING TOWER DRIVES
Motors
Right-angle gear units are driven by foot mounted IEC motors (type
B3).
For more information on motors, refer to motor catalogues.
For Nema motors, refer to us.
Use of two speed motors: when changing speed with two speed mo-
tors, the motor has to be slowed down below the low speed, before
energising the slow speed winding.
Optional devices
Some devices can optionally be provided (refer to pages B39 up to
B46). More detailed information about the optional devices is men-
tioned in separate technical manuals. Refer to us.
Backstop
Built-in backstop to prevent the fan from "wind-milling". Internal
lubrication is assured.
Filter
With incorporated pressure relief valve.
A filter with incorporated pressure relief valve and visual or electrical
contamination indicator is available as an option.
Heaters
Electrical heating devices for low temperature start-up are available
for Hansen P4 gear units from sizes C to H.
Flow switch
When gear units are pump lubricated, a flow switch can be provided
to check the oil flow to the gear unit. This switch can trigger an
alarm signal when the oil supply is inadequate. The gear unit has to
be stopped at once and the cause of the interruption of the oil sup-
ply has to be removed.
Oil level switch
To control the oil level in the gear unit, an oil level switch can be
provided. This switch can trigger an alarm signal when the oil bath
falls beneath a specified limit.
Pt100
To control the oil bath temperature. The Pt100 can trigger an alarm
signal when the oil temperature is higher than a specified limit.
Shipping conditions
Inspection prior to shipment
Test run: all gear units are tested under no load
Conformity Check
Protection
Shaft extension: greased and protected with waxed
waterproof paper
Lubricants
Hansen P4 gear units are shipped without oil.
Grease lubrication points are factory filled.
For information relating to storage, handling, installation,
start-up and maintenance, refer to the service manual which is
supplied together with each gear unit.
Protection
Standard protection systems
As a standard, Hansen P4 gear units for cooling tower drives are
provided with a painting system that is suitable to be applied in the
atmospheric-corrosivity category C4 (L) according to ISO 12944-2
(and ISO 12944-5).
The choice of colour has no influence on the technical quality of the
painting system.
Other painting systems can be offered to meet the required atmos-
pheric-corrosivity category for your application.
Bolts and nuts provided with appropriate protection.
Aggressive environment
For wet cooling tower drives in aggressive environment, an addi-
tional protection system can be offered: refer to us.
E
B4
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